12 files changed, 350 insertions, 2 deletions
diff --git a/examples/all_features/CMakeLists.txt b/examples/all_features/CMakeLists.txt
index f2573963..829c15bd 100644
--- a/examples/all_features/CMakeLists.txt
+++ b/examples/all_features/CMakeLists.txt
@@ -22,6 +22,15 @@ set(files_all
     ${files_with_output}
     concurrency.cpp
     ../../scripts/coverage_maxout.cpp
+    namespace1.cpp
+    namespace2.cpp
+    namespace3.cpp
+    namespace4.cpp
+    namespace5.cpp
+    namespace6.cpp
+    namespace7.cpp
+    namespace8.cpp
+    namespace9.cpp
 )
 
 # add the executable
@@ -49,6 +58,16 @@ if(NOT MINGW AND NOT DEFINED DOCTEST_THREAD_LOCAL)
     doctest_add_test(NO_OUTPUT NAME concurrency.cpp ${common_args} -sf=*concurrency.cpp -d) # duration: there is no output anyway
 endif()
 
+doctest_add_test(NO_OUTPUT NAME namespace1.cpp ${common_args} -sf=*namespace1.cpp )
+doctest_add_test(NO_OUTPUT NAME namespace2.cpp ${common_args} -sf=*namespace2.cpp )
+doctest_add_test(NO_OUTPUT NAME namespace3.cpp ${common_args} -sf=*namespace3.cpp )
+doctest_add_test(NO_OUTPUT NAME namespace4.cpp ${common_args} -sf=*namespace4.cpp )
+doctest_add_test(NO_OUTPUT NAME namespace5.cpp ${common_args} -sf=*namespace5.cpp )
+doctest_add_test(NO_OUTPUT NAME namespace6.cpp ${common_args} -sf=*namespace6.cpp )
+doctest_add_test(NO_OUTPUT NAME namespace7.cpp ${common_args} -sf=*namespace7.cpp )
+doctest_add_test(NO_OUTPUT NAME namespace8.cpp ${common_args} -sf=*namespace8.cpp )
+doctest_add_test(NO_OUTPUT NAME namespace9.cpp ${common_args} -sf=*namespace9.cpp )
+
 # add this separately since the file has a non-straightforward path
 doctest_add_test(NAME coverage_maxout.cpp ${common_args} -sf=*coverage_maxout.cpp)
 
diff --git a/examples/all_features/namespace1.cpp b/examples/all_features/namespace1.cpp
new file mode 100644
index 00000000..4014ab54
--- /dev/null
+++ b/examples/all_features/namespace1.cpp
@@ -0,0 +1,27 @@
+#include <doctest/doctest.h>
+
+DOCTEST_MAKE_STD_HEADERS_CLEAN_FROM_WARNINGS_ON_WALL_BEGIN
+#include <cstdint>
+#include <sstream>
+DOCTEST_MAKE_STD_HEADERS_CLEAN_FROM_WARNINGS_ON_WALL_END
+
+namespace user1 {
+struct label
+{
+    label()
+            : i(0) {}
+    int i;
+};
+} // namespace user1
+
+DOCTEST_GCC_SUPPRESS_WARNING("-Wmissing-declarations")
+DOCTEST_CLANG_SUPPRESS_WARNING("-Wmissing-prototypes")
+
+bool operator==(const user1::label& lhs, const user1::label& rhs) { return lhs.i == rhs.i; }
+
+
+TEST_CASE("namespace 1 global operator") {
+    user1::label a;
+    user1::label b;
+    CHECK(a == b);
+}
diff --git a/examples/all_features/namespace2.cpp b/examples/all_features/namespace2.cpp
new file mode 100644
index 00000000..3dc1d556
--- /dev/null
+++ b/examples/all_features/namespace2.cpp
@@ -0,0 +1,24 @@
+#include <doctest/doctest.h>
+
+DOCTEST_MAKE_STD_HEADERS_CLEAN_FROM_WARNINGS_ON_WALL_BEGIN
+#include <cstdint>
+#include <sstream>
+DOCTEST_MAKE_STD_HEADERS_CLEAN_FROM_WARNINGS_ON_WALL_END
+
+namespace user2 {
+struct label
+{
+    label()
+            : i(0) {}
+    int         i;
+    friend bool operator==(const user2::label& lhs, const user2::label& rhs) {
+        return lhs.i == rhs.i;
+    }
+};
+} // namespace user2
+
+TEST_CASE("namespace 2 friend operator") {
+    user2::label a;
+    user2::label b;
+    REQUIRE(a == b);
+}
diff --git a/examples/all_features/namespace3.cpp b/examples/all_features/namespace3.cpp
new file mode 100644
index 00000000..a1015aa0
--- /dev/null
+++ b/examples/all_features/namespace3.cpp
@@ -0,0 +1,22 @@
+#include <doctest/doctest.h>
+
+DOCTEST_MAKE_STD_HEADERS_CLEAN_FROM_WARNINGS_ON_WALL_BEGIN
+#include <cstdint>
+#include <sstream>
+DOCTEST_MAKE_STD_HEADERS_CLEAN_FROM_WARNINGS_ON_WALL_END
+
+namespace user3 {
+struct label
+{
+    label()
+            : i(0) {}
+    int  i;
+    bool operator==(const user3::label& rhs) const { return i == rhs.i; }
+};
+} // namespace user3
+
+TEST_CASE("namespace 3 member operator") {
+    user3::label a;
+    user3::label b;
+    REQUIRE(a == b);
+}
diff --git a/examples/all_features/namespace4.cpp b/examples/all_features/namespace4.cpp
new file mode 100644
index 00000000..88d74628
--- /dev/null
+++ b/examples/all_features/namespace4.cpp
@@ -0,0 +1,37 @@
+#include <doctest/doctest.h>
+
+DOCTEST_MAKE_STD_HEADERS_CLEAN_FROM_WARNINGS_ON_WALL_BEGIN
+#include <cstdint>
+#include <sstream>
+DOCTEST_MAKE_STD_HEADERS_CLEAN_FROM_WARNINGS_ON_WALL_END
+
+namespace user4 {
+struct label
+{
+    label()
+            : i(0) {}
+    int  i;
+    bool operator==(const user4::label& rhs) const { return i == rhs.i; }
+};
+} // namespace user4
+
+namespace user5 {
+struct label
+{
+    label()
+            : i(0) {}
+    int  i;
+    bool operator==(const user5::label& rhs) const { return i == rhs.i; }
+};
+} // namespace user5
+
+TEST_CASE("namespace 4 member vs member") {
+    user4::label a4;
+    user4::label b4;
+
+    user5::label a5;
+    user5::label b5;
+
+    REQUIRE(a4 == b4);
+    REQUIRE(a5 == b5);
+}
diff --git a/examples/all_features/namespace5.cpp b/examples/all_features/namespace5.cpp
new file mode 100644
index 00000000..20fb0d77
--- /dev/null
+++ b/examples/all_features/namespace5.cpp
@@ -0,0 +1,39 @@
+#include <doctest/doctest.h>
+
+DOCTEST_MAKE_STD_HEADERS_CLEAN_FROM_WARNINGS_ON_WALL_BEGIN
+#include <cstdint>
+#include <sstream>
+DOCTEST_MAKE_STD_HEADERS_CLEAN_FROM_WARNINGS_ON_WALL_END
+
+namespace user6 {
+struct label
+{
+    label()
+            : i(0) {}
+    int  i;
+    bool operator==(const user6::label& rhs) const { return i == rhs.i; }
+};
+} // namespace user6
+
+namespace user7 {
+struct label
+{
+    label()
+            : i(0) {}
+    int         i;
+    friend bool operator==(const user7::label& lhs, const user7::label& rhs) {
+        return lhs.i == rhs.i;
+    }
+};
+} // namespace user7
+
+TEST_CASE("namespace 5 member vs friend") {
+    user6::label a6;
+    user6::label b6;
+
+    user7::label a7;
+    user7::label b7;
+
+    REQUIRE(a6 == b6);
+    REQUIRE(a7 == b7);
+}
diff --git a/examples/all_features/namespace6.cpp b/examples/all_features/namespace6.cpp
new file mode 100644
index 00000000..e8c66e2a
--- /dev/null
+++ b/examples/all_features/namespace6.cpp
@@ -0,0 +1,41 @@
+#include <doctest/doctest.h>
+
+DOCTEST_MAKE_STD_HEADERS_CLEAN_FROM_WARNINGS_ON_WALL_BEGIN
+#include <cstdint>
+#include <sstream>
+DOCTEST_MAKE_STD_HEADERS_CLEAN_FROM_WARNINGS_ON_WALL_END
+
+namespace user6 {
+struct label
+{
+    label()
+            : i(0) {}
+    int         i;
+    friend bool operator==(const user6::label& lhs, const user6::label& rhs) {
+        return lhs.i == rhs.i;
+    }
+};
+} // namespace user6
+
+namespace user7 {
+struct label
+{
+    label()
+            : i(0) {}
+    int         i;
+    friend bool operator==(const user7::label& lhs, const user7::label& rhs) {
+        return lhs.i == rhs.i;
+    }
+};
+} // namespace user7
+
+TEST_CASE("namespace 6 friend vs friend") {
+    user6::label a6;
+    user6::label b6;
+
+    user7::label a7;
+    user7::label b7;
+
+    REQUIRE(a6 == b6);
+    REQUIRE(a7 == b7);
+}
diff --git a/examples/all_features/namespace7.cpp b/examples/all_features/namespace7.cpp
new file mode 100644
index 00000000..c2c27322
--- /dev/null
+++ b/examples/all_features/namespace7.cpp
@@ -0,0 +1,41 @@
+#include <doctest/doctest.h>
+
+DOCTEST_MAKE_STD_HEADERS_CLEAN_FROM_WARNINGS_ON_WALL_BEGIN
+#include <cstdint>
+#include <sstream>
+DOCTEST_MAKE_STD_HEADERS_CLEAN_FROM_WARNINGS_ON_WALL_END
+
+namespace user6 {
+struct label
+{
+    label()
+            : i(0) {}
+    int  i;
+    bool operator==(const user6::label& rhs) const { return i == rhs.i; }
+};
+} // namespace user6
+
+namespace user7 {
+struct label
+{
+    label()
+            : i(0) {}
+    int i;
+};
+} // namespace user7
+
+DOCTEST_GCC_SUPPRESS_WARNING("-Wmissing-declarations")
+DOCTEST_CLANG_SUPPRESS_WARNING("-Wmissing-prototypes")
+
+bool operator==(const user7::label& lhs, const user7::label& rhs) { return lhs.i == rhs.i; }
+
+TEST_CASE("namespace 7 member vs global") {
+    user6::label a6;
+    user6::label b6;
+
+    user7::label a7;
+    user7::label b7;
+
+    REQUIRE(a6 == b6);
+    REQUIRE(a7 == b7);
+}
diff --git a/examples/all_features/namespace8.cpp b/examples/all_features/namespace8.cpp
new file mode 100644
index 00000000..cfc2131b
--- /dev/null
+++ b/examples/all_features/namespace8.cpp
@@ -0,0 +1,45 @@
+#include <doctest/doctest.h>
+
+DOCTEST_MAKE_STD_HEADERS_CLEAN_FROM_WARNINGS_ON_WALL_BEGIN
+#include <cstdint>
+#include <sstream>
+DOCTEST_MAKE_STD_HEADERS_CLEAN_FROM_WARNINGS_ON_WALL_END
+
+namespace user6 {
+struct label
+{
+    label()
+            : i(0) {}
+    int         i;
+    friend bool operator==(const user6::label& lhs, const user6::label& rhs) {
+        return lhs.i == rhs.i;
+    }
+};
+} // namespace user6
+
+namespace user8 {
+struct label
+{
+    label()
+            : i(0) {}
+    int i;
+};
+} // namespace user8
+
+
+DOCTEST_GCC_SUPPRESS_WARNING("-Wmissing-declarations")
+DOCTEST_CLANG_SUPPRESS_WARNING("-Wmissing-prototypes")
+
+bool operator==(const user8::label& lhs, const user8::label& rhs) { return lhs.i == rhs.i; }
+
+
+TEST_CASE("namespace 8 friend vs global") {
+    user6::label a6;
+    user6::label b6;
+
+    user8::label a8;
+    user8::label b8;
+
+    REQUIRE(a6 == b6);
+    REQUIRE(a8 == b8);
+}
diff --git a/examples/all_features/namespace9.cpp b/examples/all_features/namespace9.cpp
new file mode 100644
index 00000000..078e6235
--- /dev/null
+++ b/examples/all_features/namespace9.cpp
@@ -0,0 +1,44 @@
+#include <doctest/doctest.h>
+
+DOCTEST_MAKE_STD_HEADERS_CLEAN_FROM_WARNINGS_ON_WALL_BEGIN
+#include <cstdint>
+#include <sstream>
+DOCTEST_MAKE_STD_HEADERS_CLEAN_FROM_WARNINGS_ON_WALL_END
+
+namespace user9a {
+struct label
+{
+    label()
+            : i(0) {}
+    int i;
+};
+} // namespace user9a
+
+DOCTEST_GCC_SUPPRESS_WARNING("-Wmissing-declarations")
+DOCTEST_CLANG_SUPPRESS_WARNING("-Wmissing-prototypes")
+bool operator==(const user9a::label& lhs, const user9a::label& rhs) { return lhs.i == rhs.i; }
+
+namespace user9b {
+struct label
+{
+    label()
+            : i(0) {}
+    int i;
+};
+} // namespace user9b
+
+DOCTEST_GCC_SUPPRESS_WARNING("-Wmissing-declarations")
+DOCTEST_CLANG_SUPPRESS_WARNING("-Wmissing-prototypes")
+
+bool operator==(const user9b::label& lhs, const user9b::label& rhs) { return lhs.i == rhs.i; }
+
+TEST_CASE("namespace 9 both global") {
+    user9a::label a1;
+    user9a::label a2;
+
+    user9b::label b1;
+    user9b::label b2;
+
+    REQUIRE(a1 == a2);
+    REQUIRE(b1 == b2);
+}
diff --git a/examples/all_features/test_output/filter_2.txt b/examples/all_features/test_output/filter_2.txt
index 18fe1062..8abc26e2 100644
--- a/examples/all_features/test_output/filter_2.txt
+++ b/examples/all_features/test_output/filter_2.txt
@@ -1,6 +1,6 @@
 [doctest] run with "--help" for options
 ===============================================================================
-[doctest] test cases: 0 | 0 passed | 0 failed | 81 skipped
+[doctest] test cases: 0 | 0 passed | 0 failed | 90 skipped
 [doctest] assertions: 0 | 0 passed | 0 failed |
 [doctest] Status: SUCCESS!
 Program code.
diff --git a/examples/all_features/test_output/filter_2_xml.txt b/examples/all_features/test_output/filter_2_xml.txt
index fde7c970..9bec5b7b 100644
--- a/examples/all_features/test_output/filter_2_xml.txt
+++ b/examples/all_features/test_output/filter_2_xml.txt
@@ -75,6 +75,15 @@
     <TestCase name="multiple types&lt;>" filename="templated_test_cases.cpp" line="0" skipped="true"/>
     <TestCase name="multiple types&lt;>" filename="templated_test_cases.cpp" line="0" skipped="true"/>
     <TestCase name="multiple types&lt;>" filename="templated_test_cases.cpp" line="0" skipped="true"/>
+    <TestCase name="namespace 1 global operator" filename="namespace1.cpp" line="0" skipped="true"/>
+    <TestCase name="namespace 2 friend operator" filename="namespace2.cpp" line="0" skipped="true"/>
+    <TestCase name="namespace 3 member operator" filename="namespace3.cpp" line="0" skipped="true"/>
+    <TestCase name="namespace 4 member vs member" filename="namespace4.cpp" line="0" skipped="true"/>
+    <TestCase name="namespace 5 member vs friend" filename="namespace5.cpp" line="0" skipped="true"/>
+    <TestCase name="namespace 6 friend vs friend" filename="namespace6.cpp" line="0" skipped="true"/>
+    <TestCase name="namespace 7 member vs global" filename="namespace7.cpp" line="0" skipped="true"/>
+    <TestCase name="namespace 8 friend vs global" filename="namespace8.cpp" line="0" skipped="true"/>
+    <TestCase name="namespace 9 both global" filename="namespace9.cpp" line="0" skipped="true"/>
     <TestCase name="normal macros" filename="assertion_macros.cpp" line="0" skipped="true"/>
   </TestSuite>
   <TestSuite name="ts1">
@@ -119,6 +128,6 @@
     <TestCase name="will end from an unknown exception" filename="coverage_maxout.cpp" line="0" skipped="true"/>
   </TestSuite>
   <OverallResultsAsserts successes="0" failures="0"/>
-  <OverallResultsTestCases successes="0" failures="0" skipped="81"/>
+  <OverallResultsTestCases successes="0" failures="0" skipped="90"/>
 </doctest>
 Program code.