Upstream release v2.0.3v2.0.3

2 files changed, 430 insertions, 274 deletions

diff --git a/README.md b/README.md
index 97cc275..749c310 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ include(FetchContent)
 
 FetchContent_Declare(json
   GIT_REPOSITORY https://github.com/ArthurSonzogni/nlohman_json
-  GIT_TAG v2.0.2)
+  GIT_TAG v2.0.3)
 
 FetchContent_GetProperties(json)
 if(NOT json_POPULATED)
diff --git a/include/nlohmann/json.hpp b/include/nlohmann/json.hpp
index 878fb89..25a9dbc 100644
--- a/include/nlohmann/json.hpp
+++ b/include/nlohmann/json.hpp
@@ -1,7 +1,7 @@
 /*
     __ _____ _____ _____
  __|  |   __|     |   | |  JSON for Modern C++
-|  |  |__   |  |  | | | |  version 2.0.2
+|  |  |__   |  |  | | | |  version 2.0.3
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json
 
 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
@@ -37,6 +37,7 @@ SOFTWARE.
 #include <cstddef>
 #include <cstdint>
 #include <cstdlib>
+#include <cstring>
 #include <functional>
 #include <initializer_list>
 #include <iomanip>
@@ -73,6 +74,15 @@ SOFTWARE.
     #pragma GCC diagnostic ignored "-Wfloat-equal"
 #endif
 
+// allow for portable deprecation warnings
+#if defined(__clang__) || defined(__GNUC__) || defined(__GNUG__)
+    #define JSON_DEPRECATED __attribute__((deprecated))
+#elif defined(_MSC_VER)
+    #define JSON_DEPRECATED __declspec(deprecated)
+#else
+    #define JSON_DEPRECATED
+#endif
+
 /*!
 @brief namespace for Niels Lohmann
 @see https://github.com/nlohmann
@@ -950,7 +960,7 @@ class basic_json
 
     With a parser callback function, the result of parsing a JSON text can be
     influenced. When passed to @ref parse(std::istream&, const
-    parser_callback_t) or @ref parse(const string_t&, const parser_callback_t),
+    parser_callback_t) or @ref parse(const char*, const parser_callback_t),
     it is called on certain events (passed as @ref parse_event_t via parameter
     @a event) with a set recursion depth @a depth and context JSON value
     @a parsed. The return value of the callback function is a boolean
@@ -993,7 +1003,7 @@ class basic_json
     skipped completely or replaced by an empty discarded object.
 
     @sa @ref parse(std::istream&, parser_callback_t) or
-    @ref parse(const string_t&, parser_callback_t) for examples
+    @ref parse(const char*, parser_callback_t) for examples
 
     @since version 1.0.0
     */
@@ -1057,40 +1067,10 @@ class basic_json
     }
 
     /*!
-    @brief create a null object (implicitly)
-
-    Create a `null` JSON value. This is the implicit version of the `null`
-    value constructor as it takes no parameters.
-
-    @note The class invariant is satisfied, because it poses no requirements
-    for null values.
-
-    @complexity Constant.
-
-    @exceptionsafety No-throw guarantee: this constructor never throws
-    exceptions.
-
-    @requirement This function helps `basic_json` satisfying the
-    [Container](http://en.cppreference.com/w/cpp/concept/Container)
-    requirements:
-    - The complexity is constant.
-    - As postcondition, it holds: `basic_json().empty() == true`.
-
-    @liveexample{The following code shows the constructor for a `null` JSON
-    value.,basic_json}
-
-    @sa @ref basic_json(std::nullptr_t) -- create a `null` value
-
-    @since version 1.0.0
-    */
-    basic_json() = default;
-
-    /*!
-    @brief create a null object (explicitly)
+    @brief create a null object
 
-    Create a `null` JSON value. This is the explicitly version of the `null`
-    value constructor as it takes a null pointer as parameter. It allows to
-    create `null` values by explicitly assigning a `nullptr` to a JSON value.
+    Create a `null` JSON value. It either takes a null pointer as parameter
+    (explicitly creating `null`) or no parameter (implicitly creating `null`).
     The passed null pointer itself is not read -- it is only used to choose
     the right constructor.
 
@@ -1099,15 +1079,12 @@ class basic_json
     @exceptionsafety No-throw guarantee: this constructor never throws
     exceptions.
 
-    @liveexample{The following code shows the constructor with null pointer
-    parameter.,basic_json__nullptr_t}
-
-    @sa @ref basic_json() -- default constructor (implicitly creating a `null`
-    value)
+    @liveexample{The following code shows the constructor with and without a
+    null pointer parameter.,basic_json__nullptr_t}
 
     @since version 1.0.0
     */
-    basic_json(std::nullptr_t) noexcept
+    basic_json(std::nullptr_t = nullptr) noexcept
         : basic_json(value_t::null)
     {
         assert_invariant();
@@ -1164,11 +1141,9 @@ class basic_json
 
     @since version 1.0.0
     */
-    template <class CompatibleObjectType, typename
-              std::enable_if<
-                  std::is_constructible<typename object_t::key_type, typename CompatibleObjectType::key_type>::value and
-                  std::is_constructible<basic_json, typename CompatibleObjectType::mapped_type>::value, int>::type
-              = 0>
+    template<class CompatibleObjectType, typename std::enable_if<
+                 std::is_constructible<typename object_t::key_type, typename CompatibleObjectType::key_type>::value and
+                 std::is_constructible<basic_json, typename CompatibleObjectType::mapped_type>::value, int>::type = 0>
     basic_json(const CompatibleObjectType& val)
         : m_type(value_t::object)
     {
@@ -1229,16 +1204,14 @@ class basic_json
 
     @since version 1.0.0
     */
-    template <class CompatibleArrayType, typename
-              std::enable_if<
-                  not std::is_same<CompatibleArrayType, typename basic_json_t::iterator>::value and
-                  not std::is_same<CompatibleArrayType, typename basic_json_t::const_iterator>::value and
-                  not std::is_same<CompatibleArrayType, typename basic_json_t::reverse_iterator>::value and
-                  not std::is_same<CompatibleArrayType, typename basic_json_t::const_reverse_iterator>::value and
-                  not std::is_same<CompatibleArrayType, typename array_t::iterator>::value and
-                  not std::is_same<CompatibleArrayType, typename array_t::const_iterator>::value and
-                  std::is_constructible<basic_json, typename CompatibleArrayType::value_type>::value, int>::type
-              = 0>
+    template<class CompatibleArrayType, typename std::enable_if<
+                 not std::is_same<CompatibleArrayType, typename basic_json_t::iterator>::value and
+                 not std::is_same<CompatibleArrayType, typename basic_json_t::const_iterator>::value and
+                 not std::is_same<CompatibleArrayType, typename basic_json_t::reverse_iterator>::value and
+                 not std::is_same<CompatibleArrayType, typename basic_json_t::const_reverse_iterator>::value and
+                 not std::is_same<CompatibleArrayType, typename array_t::iterator>::value and
+                 not std::is_same<CompatibleArrayType, typename array_t::const_iterator>::value and
+                 std::is_constructible<basic_json, typename CompatibleArrayType::value_type>::value, int>::type = 0>
     basic_json(const CompatibleArrayType& val)
         : m_type(value_t::array)
     {
@@ -1324,10 +1297,8 @@ class basic_json
 
     @since version 1.0.0
     */
-    template <class CompatibleStringType, typename
-              std::enable_if<
-                  std::is_constructible<string_t, CompatibleStringType>::value, int>::type
-              = 0>
+    template<class CompatibleStringType, typename std::enable_if<
+                 std::is_constructible<string_t, CompatibleStringType>::value, int>::type = 0>
     basic_json(const CompatibleStringType& val)
         : basic_json(string_t(val))
     {
@@ -1377,12 +1348,9 @@ class basic_json
 
     @since version 1.0.0
     */
-    template<typename T,
-             typename std::enable_if<
-                 not (std::is_same<T, int>::value)
-                 and std::is_same<T, number_integer_t>::value
-                 , int>::type
-             = 0>
+    template<typename T, typename std::enable_if<
+                 not (std::is_same<T, int>::value) and
+                 std::is_same<T, number_integer_t>::value, int>::type = 0>
     basic_json(const number_integer_t val) noexcept
         : m_type(value_t::number_integer), m_value(val)
     {
@@ -1446,13 +1414,11 @@ class basic_json
 
     @since version 1.0.0
     */
-    template<typename CompatibleNumberIntegerType, typename
-             std::enable_if<
+    template<typename CompatibleNumberIntegerType, typename std::enable_if<
                  std::is_constructible<number_integer_t, CompatibleNumberIntegerType>::value and
                  std::numeric_limits<CompatibleNumberIntegerType>::is_integer and
                  std::numeric_limits<CompatibleNumberIntegerType>::is_signed,
-                 CompatibleNumberIntegerType>::type
-             = 0>
+                 CompatibleNumberIntegerType>::type = 0>
     basic_json(const CompatibleNumberIntegerType val) noexcept
         : m_type(value_t::number_integer),
           m_value(static_cast<number_integer_t>(val))
@@ -1477,12 +1443,9 @@ class basic_json
 
     @since version 2.0.0
     */
-    template<typename T,
-             typename std::enable_if<
-                 not (std::is_same<T, int>::value)
-                 and std::is_same<T, number_unsigned_t>::value
-                 , int>::type
-             = 0>
+    template<typename T, typename std::enable_if<
+                 not (std::is_same<T, int>::value) and
+                 std::is_same<T, number_unsigned_t>::value, int>::type = 0>
     basic_json(const number_unsigned_t val) noexcept
         : m_type(value_t::number_unsigned), m_value(val)
     {
@@ -1509,13 +1472,11 @@ class basic_json
 
     @since version 2.0.0
     */
-    template <typename CompatibleNumberUnsignedType, typename
-              std::enable_if <
-                  std::is_constructible<number_unsigned_t, CompatibleNumberUnsignedType>::value and
-                  std::numeric_limits<CompatibleNumberUnsignedType>::is_integer and
-                  not std::numeric_limits<CompatibleNumberUnsignedType>::is_signed,
-                  CompatibleNumberUnsignedType>::type
-              = 0>
+    template<typename CompatibleNumberUnsignedType, typename std::enable_if <
+                 std::is_constructible<number_unsigned_t, CompatibleNumberUnsignedType>::value and
+                 std::numeric_limits<CompatibleNumberUnsignedType>::is_integer and
+                 not std::numeric_limits<CompatibleNumberUnsignedType>::is_signed,
+                 CompatibleNumberUnsignedType>::type = 0>
     basic_json(const CompatibleNumberUnsignedType val) noexcept
         : m_type(value_t::number_unsigned),
           m_value(static_cast<number_unsigned_t>(val))
@@ -1591,11 +1552,9 @@ class basic_json
 
     @since version 1.0.0
     */
-    template<typename CompatibleNumberFloatType, typename = typename
-             std::enable_if<
+    template<typename CompatibleNumberFloatType, typename = typename std::enable_if<
                  std::is_constructible<number_float_t, CompatibleNumberFloatType>::value and
-                 std::is_floating_point<CompatibleNumberFloatType>::value>::type
-             >
+                 std::is_floating_point<CompatibleNumberFloatType>::value>::type>
     basic_json(const CompatibleNumberFloatType val) noexcept
         : basic_json(number_float_t(val))
     {
@@ -1843,7 +1802,8 @@ class basic_json
     @param[in] first begin of the range to copy from (included)
     @param[in] last end of the range to copy from (excluded)
 
-    @pre Iterators @a first and @a last must be initialized.
+    @pre Iterators @a first and @a last must be initialized. **This
+         precondition is enforced with an assertion.**
 
     @throw std::domain_error if iterators are not compatible; that is, do not
     belong to the same JSON value; example: `"iterators are not compatible"`
@@ -1861,12 +1821,9 @@ class basic_json
 
     @since version 1.0.0
     */
-    template <class InputIT, typename
-              std::enable_if<
-                  std::is_same<InputIT, typename basic_json_t::iterator>::value or
-                  std::is_same<InputIT, typename basic_json_t::const_iterator>::value
-                  , int>::type
-              = 0>
+    template<class InputIT, typename std::enable_if<
+                 std::is_same<InputIT, typename basic_json_t::iterator>::value or
+                 std::is_same<InputIT, typename basic_json_t::const_iterator>::value, int>::type = 0>
     basic_json(InputIT first, InputIT last)
     {
         assert(first.m_object != nullptr);
@@ -1970,12 +1927,21 @@ class basic_json
 
     @note A UTF-8 byte order mark is silently ignored.
 
+    @deprecated This constructor is deprecated and will be removed in version
+      3.0.0 to unify the interface of the library. Deserialization will be
+      done by stream operators or by calling one of the `parse` functions,
+      e.g. @ref parse(std::istream&, const parser_callback_t). That is, calls
+      like `json j(i);` for an input stream @a i need to be replaced by
+      `json j = json::parse(i);`. See the example below.
+
     @liveexample{The example below demonstrates constructing a JSON value from
     a `std::stringstream` with and without callback
     function.,basic_json__istream}
 
-    @since version 2.0.0
+    @since version 2.0.0, deprecated in version 2.0.3, to be removed in
+           version 3.0.0
     */
+    JSON_DEPRECATED
     explicit basic_json(std::istream& i, const parser_callback_t cb = nullptr)
     {
         *this = parser(i, cb).parse();
@@ -2231,7 +2197,8 @@ class basic_json
     {
         std::stringstream ss;
         // fix locale problems
-        ss.imbue(std::locale(std::locale(), new DecimalSeparator));
+        const static std::locale loc(std::locale(), new DecimalSeparator);
+        ss.imbue(loc);
 
         // 6, 15 or 16 digits of precision allows round-trip IEEE 754
         // string->float->string, string->double->string or string->long
@@ -2614,11 +2581,9 @@ class basic_json
     //////////////////
 
     /// get an object (explicit)
-    template <class T, typename
-              std::enable_if<
-                  std::is_convertible<typename object_t::key_type, typename T::key_type>::value and
-                  std::is_convertible<basic_json_t, typename T::mapped_type>::value
-                  , int>::type = 0>
+    template<class T, typename std::enable_if<
+                 std::is_convertible<typename object_t::key_type, typename T::key_type>::value and
+                 std::is_convertible<basic_json_t, typename T::mapped_type>::value, int>::type = 0>
     T get_impl(T*) const
     {
         if (is_object())
@@ -2645,14 +2610,12 @@ class basic_json
     }
 
     /// get an array (explicit)
-    template <class T, typename
-              std::enable_if<
-                  std::is_convertible<basic_json_t, typename T::value_type>::value and
-                  not std::is_same<basic_json_t, typename T::value_type>::value and
-                  not std::is_arithmetic<T>::value and
-                  not std::is_convertible<std::string, T>::value and
-                  not has_mapped_type<T>::value
-                  , int>::type = 0>
+    template<class T, typename std::enable_if<
+                 std::is_convertible<basic_json_t, typename T::value_type>::value and
+                 not std::is_same<basic_json_t, typename T::value_type>::value and
+                 not std::is_arithmetic<T>::value and
+                 not std::is_convertible<std::string, T>::value and
+                 not has_mapped_type<T>::value, int>::type = 0>
     T get_impl(T*) const
     {
         if (is_array())
@@ -2672,11 +2635,9 @@ class basic_json
     }
 
     /// get an array (explicit)
-    template <class T, typename
-              std::enable_if<
-                  std::is_convertible<basic_json_t, T>::value and
-                  not std::is_same<basic_json_t, T>::value
-                  , int>::type = 0>
+    template<class T, typename std::enable_if<
+                 std::is_convertible<basic_json_t, T>::value and
+                 not std::is_same<basic_json_t, T>::value, int>::type = 0>
     std::vector<T> get_impl(std::vector<T>*) const
     {
         if (is_array())
@@ -2697,11 +2658,9 @@ class basic_json
     }
 
     /// get an array (explicit)
-    template <class T, typename
-              std::enable_if<
-                  std::is_same<basic_json, typename T::value_type>::value and
-                  not has_mapped_type<T>::value
-                  , int>::type = 0>
+    template<class T, typename std::enable_if<
+                 std::is_same<basic_json, typename T::value_type>::value and
+                 not has_mapped_type<T>::value, int>::type = 0>
     T get_impl(T*) const
     {
         if (is_array())
@@ -2728,10 +2687,8 @@ class basic_json
     }
 
     /// get a string (explicit)
-    template <typename T, typename
-              std::enable_if<
-                  std::is_convertible<string_t, T>::value
-                  , int>::type = 0>
+    template<typename T, typename std::enable_if<
+                 std::is_convertible<string_t, T>::value, int>::type = 0>
     T get_impl(T*) const
     {
         if (is_string())
@@ -2745,10 +2702,8 @@ class basic_json
     }
 
     /// get a number (explicit)
-    template<typename T, typename
-             std::enable_if<
-                 std::is_arithmetic<T>::value
-                 , int>::type = 0>
+    template<typename T, typename std::enable_if<
+                 std::is_arithmetic<T>::value, int>::type = 0>
     T get_impl(T*) const
     {
         switch (m_type)
@@ -2937,10 +2892,8 @@ class basic_json
 
     @since version 1.0.0
     */
-    template<typename ValueType, typename
-             std::enable_if<
-                 not std::is_pointer<ValueType>::value
-                 , int>::type = 0>
+    template<typename ValueType, typename std::enable_if<
+                 not std::is_pointer<ValueType>::value, int>::type = 0>
     ValueType get() const
     {
         return get_impl(static_cast<ValueType*>(nullptr));
@@ -2973,10 +2926,8 @@ class basic_json
 
     @since version 1.0.0
     */
-    template<typename PointerType, typename
-             std::enable_if<
-                 std::is_pointer<PointerType>::value
-                 , int>::type = 0>
+    template<typename PointerType, typename std::enable_if<
+                 std::is_pointer<PointerType>::value, int>::type = 0>
     PointerType get() noexcept
     {
         // delegate the call to get_ptr
@@ -2987,10 +2938,8 @@ class basic_json
     @brief get a pointer value (explicit)
     @copydoc get()
     */
-    template<typename PointerType, typename
-             std::enable_if<
-                 std::is_pointer<PointerType>::value
-                 , int>::type = 0>
+    template<typename PointerType, typename std::enable_if<
+                 std::is_pointer<PointerType>::value, int>::type = 0>
     constexpr const PointerType get() const noexcept
     {
         // delegate the call to get_ptr
@@ -3023,10 +2972,8 @@ class basic_json
 
     @since version 1.0.0
     */
-    template<typename PointerType, typename
-             std::enable_if<
-                 std::is_pointer<PointerType>::value
-                 , int>::type = 0>
+    template<typename PointerType, typename std::enable_if<
+                 std::is_pointer<PointerType>::value, int>::type = 0>
     PointerType get_ptr() noexcept
     {
         // get the type of the PointerType (remove pointer and const)
@@ -3052,11 +2999,9 @@ class basic_json
     @brief get a pointer value (implicit)
     @copydoc get_ptr()
     */
-    template<typename PointerType, typename
-             std::enable_if<
-                 std::is_pointer<PointerType>::value
-                 and std::is_const<typename std::remove_pointer<PointerType>::type>::value
-                 , int>::type = 0>
+    template<typename PointerType, typename std::enable_if<
+                 std::is_pointer<PointerType>::value and
+                 std::is_const<typename std::remove_pointer<PointerType>::type>::value, int>::type = 0>
     constexpr const PointerType get_ptr() const noexcept
     {
         // get the type of the PointerType (remove pointer and const)
@@ -3104,10 +3049,8 @@ class basic_json
 
     @since version 1.1.0
     */
-    template<typename ReferenceType, typename
-             std::enable_if<
-                 std::is_reference<ReferenceType>::value
-                 , int>::type = 0>
+    template<typename ReferenceType, typename std::enable_if<
+                 std::is_reference<ReferenceType>::value, int>::type = 0>
     ReferenceType get_ref()
     {
         // delegate call to get_ref_impl
@@ -3118,11 +3061,9 @@ class basic_json
     @brief get a reference value (implicit)
     @copydoc get_ref()
     */
-    template<typename ReferenceType, typename
-             std::enable_if<
-                 std::is_reference<ReferenceType>::value
-                 and std::is_const<typename std::remove_reference<ReferenceType>::type>::value
-                 , int>::type = 0>
+    template<typename ReferenceType, typename std::enable_if<
+                 std::is_reference<ReferenceType>::value and
+                 std::is_const<typename std::remove_reference<ReferenceType>::type>::value, int>::type = 0>
     ReferenceType get_ref() const
     {
         // delegate call to get_ref_impl
@@ -3157,10 +3098,9 @@ class basic_json
 
     @since version 1.0.0
     */
-    template < typename ValueType, typename
-               std::enable_if <
-                   not std::is_pointer<ValueType>::value
-                   and not std::is_same<ValueType, typename string_t::value_type>::value
+    template < typename ValueType, typename std::enable_if <
+                   not std::is_pointer<ValueType>::value and
+                   not std::is_same<ValueType, typename string_t::value_type>::value
 #ifndef _MSC_VER  // Fix for issue #167 operator<< abiguity under VS2015
                    and not std::is_same<ValueType, std::initializer_list<typename string_t::value_type>>::value
 #endif
@@ -3509,6 +3449,9 @@ class basic_json
 
     @return const reference to the element at key @a key
 
+    @pre The element with key @a key must exist. **This precondition is
+         enforced with an assertion.**
+
     @throw std::domain_error if JSON is not an object; example: `"cannot use
     operator[] with null"`
 
@@ -3667,6 +3610,9 @@ class basic_json
 
     @return const reference to the element at key @a key
 
+    @pre The element with key @a key must exist. **This precondition is
+         enforced with an assertion.**
+
     @throw std::domain_error if JSON is not an object; example: `"cannot use
     operator[] with null"`
 
@@ -3744,10 +3690,8 @@ class basic_json
 
     @since version 1.0.0
     */
-    template <class ValueType, typename
-              std::enable_if<
-                  std::is_convertible<basic_json_t, ValueType>::value
-                  , int>::type = 0>
+    template<class ValueType, typename std::enable_if<
+                 std::is_convertible<basic_json_t, ValueType>::value, int>::type = 0>
     ValueType value(const typename object_t::key_type& key, ValueType default_value) const
     {
         // at only works for objects
@@ -3820,10 +3764,8 @@ class basic_json
 
     @since version 2.0.2
     */
-    template <class ValueType, typename
-              std::enable_if<
-                  std::is_convertible<basic_json_t, ValueType>::value
-                  , int>::type = 0>
+    template<class ValueType, typename std::enable_if<
+                 std::is_convertible<basic_json_t, ValueType>::value, int>::type = 0>
     ValueType value(const json_pointer& ptr, ValueType default_value) const
     {
         // at only works for objects
@@ -3867,7 +3809,8 @@ class basic_json
     @complexity Constant.
 
     @pre The JSON value must not be `null` (would throw `std::out_of_range`)
-    or an empty array or object (undefined behavior, guarded by assertions).
+    or an empty array or object (undefined behavior, **guarded by
+    assertions**).
     @post The JSON value remains unchanged.
 
     @throw std::out_of_range when called on `null` value
@@ -3909,7 +3852,8 @@ class basic_json
     @complexity Constant.
 
     @pre The JSON value must not be `null` (would throw `std::out_of_range`)
-    or an empty array or object (undefined behavior, guarded by assertions).
+    or an empty array or object (undefined behavior, **guarded by
+    assertions**).
     @post The JSON value remains unchanged.
 
     @throw std::out_of_range when called on `null` value.
@@ -3951,7 +3895,7 @@ class basic_json
     @return Iterator following the last removed element. If the iterator @a
     pos refers to the last element, the `end()` iterator is returned.
 
-    @tparam InteratorType an @ref iterator or @ref const_iterator
+    @tparam IteratorType an @ref iterator or @ref const_iterator
 
     @post Invalidates iterators and references at or after the point of the
     erase, including the `end()` iterator.
@@ -3973,7 +3917,7 @@ class basic_json
     @liveexample{The example shows the result of `erase()` for different JSON
     types.,erase__IteratorType}
 
-    @sa @ref erase(InteratorType, InteratorType) -- removes the elements in
+    @sa @ref erase(IteratorType, IteratorType) -- removes the elements in
     the given range
     @sa @ref erase(const typename object_t::key_type&) -- removes the element
     from an object at the given key
@@ -3982,13 +3926,11 @@ class basic_json
 
     @since version 1.0.0
     */
-    template <class InteratorType, typename
-              std::enable_if<
-                  std::is_same<InteratorType, typename basic_json_t::iterator>::value or
-                  std::is_same<InteratorType, typename basic_json_t::const_iterator>::value
-                  , int>::type
-              = 0>
-    InteratorType erase(InteratorType pos)
+    template<class IteratorType, typename std::enable_if<
+                 std::is_same<IteratorType, typename basic_json_t::iterator>::value or
+                 std::is_same<IteratorType, typename basic_json_t::const_iterator>::value, int>::type
+             = 0>
+    IteratorType erase(IteratorType pos)
     {
         // make sure iterator fits the current value
         if (this != pos.m_object)
@@ -3996,7 +3938,7 @@ class basic_json
             throw std::domain_error("iterator does not fit current value");
         }
 
-        InteratorType result = end();
+        IteratorType result = end();
 
         switch (m_type)
         {
@@ -4060,7 +4002,7 @@ class basic_json
     @return Iterator following the last removed element. If the iterator @a
     second refers to the last element, the `end()` iterator is returned.
 
-    @tparam InteratorType an @ref iterator or @ref const_iterator
+    @tparam IteratorType an @ref iterator or @ref const_iterator
 
     @post Invalidates iterators and references at or after the point of the
     erase, including the `end()` iterator.
@@ -4083,7 +4025,7 @@ class basic_json
     @liveexample{The example shows the result of `erase()` for different JSON
     types.,erase__IteratorType_IteratorType}
 
-    @sa @ref erase(InteratorType) -- removes the element at a given position
+    @sa @ref erase(IteratorType) -- removes the element at a given position
     @sa @ref erase(const typename object_t::key_type&) -- removes the element
     from an object at the given key
     @sa @ref erase(const size_type) -- removes the element from an array at
@@ -4091,13 +4033,11 @@ class basic_json
 
     @since version 1.0.0
     */
-    template <class InteratorType, typename
-              std::enable_if<
-                  std::is_same<InteratorType, typename basic_json_t::iterator>::value or
-                  std::is_same<InteratorType, typename basic_json_t::const_iterator>::value
-                  , int>::type
-              = 0>
-    InteratorType erase(InteratorType first, InteratorType last)
+    template<class IteratorType, typename std::enable_if<
+                 std::is_same<IteratorType, typename basic_json_t::iterator>::value or
+                 std::is_same<IteratorType, typename basic_json_t::const_iterator>::value, int>::type
+             = 0>
+    IteratorType erase(IteratorType first, IteratorType last)
     {
         // make sure iterator fits the current value
         if (this != first.m_object or this != last.m_object)
@@ -4105,7 +4045,7 @@ class basic_json
             throw std::domain_error("iterators do not fit current value");
         }
 
-        InteratorType result = end();
+        IteratorType result = end();
 
         switch (m_type)
         {
@@ -4177,8 +4117,8 @@ class basic_json
 
     @liveexample{The example shows the effect of `erase()`.,erase__key_type}
 
-    @sa @ref erase(InteratorType) -- removes the element at a given position
-    @sa @ref erase(InteratorType, InteratorType) -- removes the elements in
+    @sa @ref erase(IteratorType) -- removes the element at a given position
+    @sa @ref erase(IteratorType, IteratorType) -- removes the elements in
     the given range
     @sa @ref erase(const size_type) -- removes the element from an array at
     the given index
@@ -4214,8 +4154,8 @@ class basic_json
 
     @liveexample{The example shows the effect of `erase()`.,erase__size_type}
 
-    @sa @ref erase(InteratorType) -- removes the element at a given position
-    @sa @ref erase(InteratorType, InteratorType) -- removes the elements in
+    @sa @ref erase(IteratorType) -- removes the element at a given position
+    @sa @ref erase(IteratorType, IteratorType) -- removes the elements in
     the given range
     @sa @ref erase(const typename object_t::key_type&) -- removes the element
     from an object at the given key
@@ -5923,9 +5863,45 @@ class basic_json
     /// @{
 
     /*!
-    @brief deserialize from string
+    @brief deserialize from an array
+
+    This function reads from an array of 1-byte values.
+
+    @pre Each element of the container has a size of 1 byte. Violating this
+    precondition yields undefined behavior. **This precondition is enforced
+    with a static assertion.**
+
+    @param[in] array  array to read from
+    @param[in] cb  a parser callback function of type @ref parser_callback_t
+    which is used to control the deserialization by filtering unwanted values
+    (optional)
+
+    @return result of the deserialization
 
-    @param[in] s  string to read a serialized JSON value from
+    @complexity Linear in the length of the input. The parser is a predictive
+    LL(1) parser. The complexity can be higher if the parser callback function
+    @a cb has a super-linear complexity.
+
+    @note A UTF-8 byte order mark is silently ignored.
+
+    @liveexample{The example below demonstrates the `parse()` function reading
+    from an array.,parse__array__parser_callback_t}
+
+    @since version 2.0.3
+    */
+    template<class T, std::size_t N>
+    static basic_json parse(T (&array)[N],
+                            const parser_callback_t cb = nullptr)
+    {
+        // delegate the call to the iterator-range parse overload
+        return parse(std::begin(array), std::end(array), cb);
+    }
+
+    /*!
+    @brief deserialize from string literal
+
+    @tparam CharT character/literal type with size of 1 byte
+    @param[in] s  string literal to read a serialized JSON value from
     @param[in] cb a parser callback function of type @ref parser_callback_t
     which is used to control the deserialization by filtering unwanted values
     (optional)
@@ -5937,6 +5913,8 @@ class basic_json
     @a cb has a super-linear complexity.
 
     @note A UTF-8 byte order mark is silently ignored.
+    @note String containers like `std::string` or @ref string_t can be parsed
+          with @ref parse(const ContiguousContainer&, const parser_callback_t)
 
     @liveexample{The example below demonstrates the `parse()` function with
     and without callback function.,parse__string__parser_callback_t}
@@ -5944,12 +5922,16 @@ class basic_json
     @sa @ref parse(std::istream&, const parser_callback_t) for a version that
     reads from an input stream
 
-    @since version 1.0.0
+    @since version 1.0.0 (originally for @ref string_t)
     */
-    static basic_json parse(const string_t& s,
+    template<typename CharPT, typename std::enable_if<
+                 std::is_pointer<CharPT>::value and
+                 std::is_integral<typename std::remove_pointer<CharPT>::type>::value and
+                 sizeof(typename std::remove_pointer<CharPT>::type) == 1, int>::type = 0>
+    static basic_json parse(const CharPT s,
                             const parser_callback_t cb = nullptr)
     {
-        return parser(s, cb).parse();
+        return parser(reinterpret_cast<const char*>(s), cb).parse();
     }
 
     /*!
@@ -5971,7 +5953,7 @@ class basic_json
     @liveexample{The example below demonstrates the `parse()` function with
     and without callback function.,parse__istream__parser_callback_t}
 
-    @sa @ref parse(const string_t&, const parser_callback_t) for a version
+    @sa @ref parse(const char*, const parser_callback_t) for a version
     that reads from a string
 
     @since version 1.0.0
@@ -5992,6 +5974,130 @@ class basic_json
     }
 
     /*!
+    @brief deserialize from an iterator range with contiguous storage
+
+    This function reads from an iterator range of a container with contiguous
+    storage of 1-byte values. Compatible container types include
+    `std::vector`, `std::string`, `std::array`, `std::valarray`, and
+    `std::initializer_list`. Furthermore, C-style arrays can be used with
+    `std::begin()`/`std::end()`. User-defined containers can be used as long
+    as they implement random-access iterators and a contiguous storage.
+
+    @pre The iterator range is contiguous. Violating this precondition yields
+    undefined behavior. **This precondition is enforced with an assertion.**
+    @pre Each element in the range has a size of 1 byte. Violating this
+    precondition yields undefined behavior. **This precondition is enforced
+    with a static assertion.**
+
+    @warning There is no way to enforce all preconditions at compile-time. If
+             the function is called with noncompliant iterators and with
+             assertions switched off, the behavior is undefined and will most
+             likely yield segmentation violation.
+
+    @tparam IteratorType iterator of container with contiguous storage
+    @param[in] first  begin of the range to parse (included)
+    @param[in] last  end of the range to parse (excluded)
+    @param[in] cb  a parser callback function of type @ref parser_callback_t
+    which is used to control the deserialization by filtering unwanted values
+    (optional)
+
+    @return result of the deserialization
+
+    @complexity Linear in the length of the input. The parser is a predictive
+    LL(1) parser. The complexity can be higher if the parser callback function
+    @a cb has a super-linear complexity.
+
+    @note A UTF-8 byte order mark is silently ignored.
+
+    @liveexample{The example below demonstrates the `parse()` function reading
+    from an iterator range.,parse__iteratortype__parser_callback_t}
+
+    @since version 2.0.3
+    */
+    template<class IteratorType, typename std::enable_if<
+                 std::is_base_of<
+                     std::random_access_iterator_tag,
+                     typename std::iterator_traits<IteratorType>::iterator_category>::value, int>::type = 0>
+    static basic_json parse(IteratorType first, IteratorType last,
+                            const parser_callback_t cb = nullptr)
+    {
+        // assertion to check that the iterator range is indeed contiguous,
+        // see http://stackoverflow.com/a/35008842/266378 for more discussion
+        assert(std::accumulate(first, last, std::make_pair<bool, int>(true, 0),
+                               [&first](std::pair<bool, int> res, decltype(*first) val)
+        {
+            res.first &= (val == *(std::next(std::addressof(*first), res.second++)));
+            return res;
+        }).first);
+
+        // assertion to check that each element is 1 byte long
+        static_assert(sizeof(typename std::iterator_traits<IteratorType>::value_type) == 1,
+                      "each element in the iterator range must have the size of 1 byte");
+
+        // if iterator range is empty, create a parser with an empty string
+        // to generate "unexpected EOF" error message
+        if (std::distance(first, last) <= 0)
+        {
+            return parser("").parse();
+        }
+
+        return parser(first, last, cb).parse();
+    }
+
+    /*!
+    @brief deserialize from a container with contiguous storage
+
+    This function reads from a container with contiguous storage of 1-byte
+    values. Compatible container types include `std::vector`, `std::string`,
+    `std::array`, and `std::initializer_list`. User-defined containers can be
+    used as long as they implement random-access iterators and a contiguous
+    storage.
+
+    @pre The container storage is contiguous. Violating this precondition
+    yields undefined behavior. **This precondition is enforced with an
+    assertion.**
+    @pre Each element of the container has a size of 1 byte. Violating this
+    precondition yields undefined behavior. **This precondition is enforced
+    with a static assertion.**
+
+    @warning There is no way to enforce all preconditions at compile-time. If
+             the function is called with a noncompliant container and with
+             assertions switched off, the behavior is undefined and will most
+             likely yield segmentation violation.
+
+    @tparam ContiguousContainer container type with contiguous storage
+    @param[in] c  container to read from
+    @param[in] cb  a parser callback function of type @ref parser_callback_t
+    which is used to control the deserialization by filtering unwanted values
+    (optional)
+
+    @return result of the deserialization
+
+    @complexity Linear in the length of the input. The parser is a predictive
+    LL(1) parser. The complexity can be higher if the parser callback function
+    @a cb has a super-linear complexity.
+
+    @note A UTF-8 byte order mark is silently ignored.
+
+    @liveexample{The example below demonstrates the `parse()` function reading
+    from a contiguous container.,parse__contiguouscontainer__parser_callback_t}
+
+    @since version 2.0.3
+    */
+    template<class ContiguousContainer, typename std::enable_if<
+                 not std::is_pointer<ContiguousContainer>::value and
+                 std::is_base_of<
+                     std::random_access_iterator_tag,
+                     typename std::iterator_traits<decltype(std::begin(std::declval<ContiguousContainer const>()))>::iterator_category>::value
+                 , int>::type = 0>
+    static basic_json parse(const ContiguousContainer& c,
+                            const parser_callback_t cb = nullptr)
+    {
+        // delegate the call to the iterator-range parse overload
+        return parse(std::begin(c), std::end(c), cb);
+    }
+
+    /*!
     @brief deserialize from stream
 
     Deserializes an input stream to a JSON value.
@@ -6044,7 +6150,7 @@ class basic_json
     Returns the type name as string to be used in error messages - usually to
     indicate that a function was called on a wrong JSON type.
 
-    @return basically a string representation of a the @ref m_type member
+    @return basically a string representation of a the @a m_type member
 
     @complexity Constant.
 
@@ -6592,8 +6698,8 @@ class basic_json
     @note An iterator is called *initialized* when a pointer to a JSON value
           has been set (e.g., by a constructor or a copy assignment). If the
           iterator is default-constructed, it is *uninitialized* and most
-          methods are undefined. The library uses assertions to detect calls
-          on uninitialized iterators.
+          methods are undefined. **The library uses assertions to detect calls
+          on uninitialized iterators.**
 
     @requirement The class satisfies the following concept requirements:
     - [RandomAccessIterator](http://en.cppreference.com/w/cpp/concept/RandomAccessIterator):
@@ -7495,32 +7601,25 @@ class basic_json
         /// the char type to use in the lexer
         using lexer_char_t = unsigned char;
 
-        /// constructor with a given buffer
-        explicit lexer(const string_t& s) noexcept
-            : m_stream(nullptr), m_buffer(s)
+        /// a lexer from a buffer with given length
+        lexer(const lexer_char_t* buff, const size_t len) noexcept
+            : m_content(buff)
         {
-            m_content = reinterpret_cast<const lexer_char_t*>(m_buffer.c_str());
             assert(m_content != nullptr);
             m_start = m_cursor = m_content;
-            m_limit = m_content + s.size();
+            m_limit = m_content + len;
         }
 
-        /// constructor with a given stream
-        explicit lexer(std::istream* s) noexcept
-            : m_stream(s), m_buffer()
+        /// a lexer from an input stream
+        explicit lexer(std::istream& s)
+            : m_stream(&s), m_line_buffer()
         {
-            assert(m_stream != nullptr);
-            std::getline(*m_stream, m_buffer);
-            m_content = reinterpret_cast<const lexer_char_t*>(m_buffer.c_str());
-            assert(m_content != nullptr);
-            m_start = m_cursor = m_content;
-            m_limit = m_content + m_buffer.size();
+            // fill buffer
+            fill_line_buffer();
         }
 
-        /// default constructor
-        lexer() = default;
-
-        // switch off unwanted functions
+        // switch off unwanted functions (due to pointer members)
+        lexer() = delete;
         lexer(const lexer&) = delete;
         lexer operator=(const lexer&) = delete;
 
@@ -7673,7 +7772,7 @@ class basic_json
         infinite sequence of whitespace or byte-order-marks. This contradicts
         the assumption of finite input, q.e.d.
         */
-        token_type scan() noexcept
+        token_type scan()
         {
             while (true)
             {
@@ -7725,7 +7824,7 @@ class basic_json
                     };
                     if ((m_limit - m_cursor) < 5)
                     {
-                        yyfill();    // LCOV_EXCL_LINE;
+                        fill_line_buffer();
                     }
                     yych = *m_cursor;
                     if (yybm[0 + yych] & 32)
@@ -7859,7 +7958,7 @@ basic_json_parser_6:
                     ++m_cursor;
                     if (m_limit <= m_cursor)
                     {
-                        yyfill();    // LCOV_EXCL_LINE;
+                        fill_line_buffer();
                     }
                     yych = *m_cursor;
                     if (yybm[0 + yych] & 32)
@@ -7929,7 +8028,7 @@ basic_json_parser_15:
                     m_marker = ++m_cursor;
                     if ((m_limit - m_cursor) < 3)
                     {
-                        yyfill();    // LCOV_EXCL_LINE;
+                        fill_line_buffer();
                     }
                     yych = *m_cursor;
                     if (yybm[0 + yych] & 64)
@@ -8022,7 +8121,7 @@ basic_json_parser_31:
                     ++m_cursor;
                     if (m_limit <= m_cursor)
                     {
-                        yyfill();    // LCOV_EXCL_LINE;
+                        fill_line_buffer();
                     }
                     yych = *m_cursor;
 basic_json_parser_32:
@@ -8059,7 +8158,7 @@ basic_json_parser_36:
                     ++m_cursor;
                     if (m_limit <= m_cursor)
                     {
-                        yyfill();    // LCOV_EXCL_LINE;
+                        fill_line_buffer();
                     }
                     yych = *m_cursor;
                     if (yych <= 'e')
@@ -8203,7 +8302,7 @@ basic_json_parser_43:
                     ++m_cursor;
                     if (m_limit <= m_cursor)
                     {
-                        yyfill();    // LCOV_EXCL_LINE;
+                        fill_line_buffer();
                     }
                     yych = *m_cursor;
                     if (yych <= '@')
@@ -8239,7 +8338,7 @@ basic_json_parser_44:
                     m_marker = ++m_cursor;
                     if ((m_limit - m_cursor) < 3)
                     {
-                        yyfill();    // LCOV_EXCL_LINE;
+                        fill_line_buffer();
                     }
                     yych = *m_cursor;
                     if (yych <= 'D')
@@ -8280,7 +8379,7 @@ basic_json_parser_47:
                     ++m_cursor;
                     if (m_limit <= m_cursor)
                     {
-                        yyfill();    // LCOV_EXCL_LINE;
+                        fill_line_buffer();
                     }
                     yych = *m_cursor;
                     if (yych <= '/')
@@ -8322,7 +8421,7 @@ basic_json_parser_54:
                     ++m_cursor;
                     if (m_limit <= m_cursor)
                     {
-                        yyfill();    // LCOV_EXCL_LINE;
+                        fill_line_buffer();
                     }
                     yych = *m_cursor;
                     if (yych <= '@')
@@ -8376,7 +8475,7 @@ basic_json_parser_60:
                     ++m_cursor;
                     if (m_limit <= m_cursor)
                     {
-                        yyfill();    // LCOV_EXCL_LINE;
+                        fill_line_buffer();
                     }
                     yych = *m_cursor;
                     if (yych <= '@')
@@ -8417,7 +8516,7 @@ basic_json_parser_63:
                     ++m_cursor;
                     if (m_limit <= m_cursor)
                     {
-                        yyfill();    // LCOV_EXCL_LINE;
+                        fill_line_buffer();
                     }
                     yych = *m_cursor;
                     if (yych <= '@')
@@ -8455,30 +8554,76 @@ basic_json_parser_63:
             return last_token_type;
         }
 
-        /// append data from the stream to the internal buffer
-        void yyfill() noexcept
+        /*!
+        @brief append data from the stream to the line buffer
+
+        This function is called by the scan() function when the end of the
+        buffer (`m_limit`) is reached and the `m_cursor` pointer cannot be
+        incremented without leaving the limits of the line buffer. Note re2c
+        decides when to call this function.
+
+        If the lexer reads from contiguous storage, there is no trailing null
+        byte. Therefore, this function must make sure to add these padding
+        null bytes.
+
+        If the lexer reads from an input stream, this function reads the next
+        line of the input.
+
+        @pre
+            p p p p p p u u u u u x . . . . . .
+            ^           ^       ^   ^
+            m_content   m_start |   m_limit
+                                m_cursor
+
+        @post
+            u u u u u x x x x x x x . . . . . .
+            ^       ^               ^
+            |       m_cursor        m_limit
+            m_start
+            m_content
+        */
+        void fill_line_buffer()
         {
-            if (m_stream == nullptr or not * m_stream)
-            {
-                return;
-            }
-
+            // number of processed characters (p)
             const auto offset_start = m_start - m_content;
-            const auto offset_marker = m_marker - m_start;
+            // offset for m_marker wrt. to m_start
+            const auto offset_marker = (m_marker == nullptr) ? 0 : m_marker - m_start;
+            // number of unprocessed characters (u)
             const auto offset_cursor = m_cursor - m_start;
 
-            m_buffer.erase(0, static_cast<size_t>(offset_start));
-            std::string line;
-            assert(m_stream != nullptr);
-            std::getline(*m_stream, line);
-            m_buffer += "\n" + line; // add line with newline symbol
+            // no stream is used or end of file is reached
+            if (m_stream == nullptr or not * m_stream)
+            {
+                // copy unprocessed characters to line buffer
+                m_line_buffer.clear();
+                for (m_cursor = m_start; m_cursor != m_limit; ++m_cursor)
+                {
+                    m_line_buffer.append(1, static_cast<const char>(*m_cursor));
+                }
 
-            m_content = reinterpret_cast<const lexer_char_t*>(m_buffer.c_str());
+                // append 5 characters (size of longest keyword "false") to
+                // make sure that there is sufficient space between m_cursor
+                // and m_limit
+                m_line_buffer.append(5, '\0');
+            }
+            else
+            {
+                // delete processed characters from line buffer
+                m_line_buffer.erase(0, static_cast<size_t>(offset_start));
+                // read next line from input stream
+                std::string line;
+                std::getline(*m_stream, line);
+                // add line with newline symbol to the line buffer
+                m_line_buffer += "\n" + line;
+            }
+
+            // set pointers
+            m_content = reinterpret_cast<const lexer_char_t*>(m_line_buffer.c_str());
             assert(m_content != nullptr);
             m_start  = m_content;
             m_marker = m_start + offset_marker;
             m_cursor = m_start + offset_cursor;
-            m_limit  = m_start + m_buffer.size() - 1;
+            m_limit  = m_start + m_line_buffer.size();
         }
 
         /// return string representation of last read token
@@ -8820,8 +8965,8 @@ basic_json_parser_63:
       private:
         /// optional input stream
         std::istream* m_stream = nullptr;
-        /// the buffer
-        string_t m_buffer;
+        /// line buffer buffer for m_stream
+        string_t m_line_buffer {};
         /// the buffer pointer
         const lexer_char_t* m_content = nullptr;
         /// pointer to the beginning of the current symbol
@@ -8844,25 +8989,34 @@ basic_json_parser_63:
     class parser
     {
       public:
-        /// constructor for strings
-        parser(const string_t& s, const parser_callback_t cb = nullptr) noexcept
-            : callback(cb), m_lexer(s)
-        {
-            // read first token
-            get_token();
-        }
+        /// a parser reading from a string literal
+        parser(const char* buff, const parser_callback_t cb = nullptr)
+            : callback(cb),
+              m_lexer(reinterpret_cast<const typename lexer::lexer_char_t*>(buff), strlen(buff))
+        {}
 
         /// a parser reading from an input stream
-        parser(std::istream& _is, const parser_callback_t cb = nullptr) noexcept
-            : callback(cb), m_lexer(&_is)
-        {
-            // read first token
-            get_token();
-        }
+        parser(std::istream& is, const parser_callback_t cb = nullptr)
+            : callback(cb), m_lexer(is)
+        {}
+
+        /// a parser reading from an iterator range with contiguous storage
+        template<class IteratorType, typename std::enable_if<
+                     std::is_same<typename std::iterator_traits<IteratorType>::iterator_category, std::random_access_iterator_tag>::value
+                     , int>::type
+                 = 0>
+        parser(IteratorType first, IteratorType last, const parser_callback_t cb = nullptr)
+            : callback(cb),
+              m_lexer(reinterpret_cast<const typename lexer::lexer_char_t*>(&(*first)),
+                      static_cast<size_t>(std::distance(first, last)))
+        {}
 
         /// public parser interface
         basic_json parse()
         {
+            // read first token
+            get_token();
+
             basic_json result = parse_internal(true);
             result.assert_invariant();
 
@@ -8883,7 +9037,8 @@ basic_json_parser_63:
             {
                 case lexer::token_type::begin_object:
                 {
-                    if (keep and (not callback or (keep = callback(depth++, parse_event_t::object_start, result))))
+                    if (keep and (not callback
+                                  or ((keep = callback(depth++, parse_event_t::object_start, result)) != 0)))
                     {
                         // explicitly set result to object to cope with {}
                         result.m_type = value_t::object;
@@ -8961,7 +9116,8 @@ basic_json_parser_63:
 
                 case lexer::token_type::begin_array:
                 {
-                    if (keep and (not callback or (keep = callback(depth++, parse_event_t::array_start, result))))
+                    if (keep and (not callback
+                                  or ((keep = callback(depth++, parse_event_t::array_start, result)) != 0)))
                     {
                         // explicitly set result to object to cope with []
                         result.m_type = value_t::array;
@@ -9067,7 +9223,7 @@ basic_json_parser_63:
         }
 
         /// get next token from lexer
-        typename lexer::token_type get_token() noexcept
+        typename lexer::token_type get_token()
         {
             last_token = m_lexer.scan();
             return last_token;
@@ -9475,7 +9631,7 @@ basic_json_parser_63:
         }
 
         /// split the string input to reference tokens
-        static std::vector<std::string> split(std::string reference_string)
+        static std::vector<std::string> split(const std::string& reference_string)
         {
             std::vector<std::string> result;
 
@@ -10203,7 +10359,7 @@ basic_json_parser_63:
     */
     static basic_json diff(const basic_json& source,
                            const basic_json& target,
-                           std::string path = "")
+                           const std::string& path = "")
     {
         // the patch
         basic_json result(value_t::array);
@@ -10365,7 +10521,7 @@ namespace std
 
 @since version 1.0.0
 */
-template <>
+template<>
 inline void swap(nlohmann::json& j1,
                  nlohmann::json& j2) noexcept(
                      is_nothrow_move_constructible<nlohmann::json>::value and
@@ -10376,7 +10532,7 @@ inline void swap(nlohmann::json& j1,
 }
 
 /// hash value for JSON objects
-template <>
+template<>
 struct hash<nlohmann::json>
 {
     /*!
@@ -10407,7 +10563,7 @@ if no parse error occurred.
 */
 inline nlohmann::json operator "" _json(const char* s, std::size_t)
 {
-    return nlohmann::json::parse(reinterpret_cast<const nlohmann::json::string_t::value_type*>(s));
+    return nlohmann::json::parse(s);
 }
 
 /*!