Changed implementation of gsl::narrow to throw gsl::narrowing_error

Implementation now behaves as described in the C++ Core Guidlines

1 files changed, 6 insertions, 2 deletions

diff --git a/include/gsl/gsl_util b/include/gsl/gsl_util
index d1f7f33..bc65923 100644
--- a/include/gsl/gsl_util
+++ b/include/gsl/gsl_util
@@ -96,6 +96,10 @@ constexpr T narrow_cast(U&& u) noexcept
     return static_cast<T>(std::forward<U>(u));
 }
 
+struct narrowing_error : public std::exception
+{
+};
+
 namespace details
 {
     template <class T, class U>
@@ -115,9 +119,9 @@ constexpr
 T narrow(U u) noexcept(false)
 {
     T t = narrow_cast<T>(u);
-    if (static_cast<U>(t) != u) gsl::details::terminate();
+    if (static_cast<U>(t) != u) throw narrowing_error{};
     if (!details::is_same_signedness<T, U>::value && ((t < T{}) != (u < U{})))
-        gsl::details::terminate();
+        throw narrowing_error{};
     return t;
 }