add enum_type to traits

untests/enum_examples.cpp

@@ -22,8 +22,35 @@ namespace
     ENUM_HPP_REGISTER_TRAITS(color)
 }
 
+namespace some_namespace
+{
+    ENUM_HPP_CLASS_DECL(color, unsigned,
+        (red = 0xFF0000)
+        (green = 0x00FF00)
+        (blue = 0x0000FF)
+        (white = red | green | blue))
+
+    ENUM_HPP_REGISTER_TRAITS(color)
+}
+
+namespace external_ns
+{
+    enum class external_enum : unsigned short {
+        a = 10,
+        b,
+        c = a + b
+    };
+
+    ENUM_HPP_TRAITS_DECL(external_enum,
+        (a)
+        (b)
+        (c))
+
+    ENUM_HPP_REGISTER_TRAITS(external_enum)
+}
+
 TEST_CASE("examples") {
-    SUBCASE("traits_using") {
+    SUBCASE("traits using") {
         // size
         static_assert(color_traits::size == 4);
 
@@ -47,16 +74,24 @@ TEST_CASE("examples") {
         static_assert(color_traits::from_index(42) == std::nullopt);
 
         // names
-        for ( auto n : color_traits::names ) {
+        for ( std::string_view n : color_traits::names ) {
             std::cout << n << ",";
         } // stdout: red,green,blue,
     }
 
-    SUBCASE("generic_context") {
+    SUBCASE("generic context") {
+        using color = some_namespace::color;
+
         // to string
         static_assert(enum_hpp::to_string(color::red) == "red");
 
         // from string
         static_assert(enum_hpp::from_string<color>("red") == color::red);
     }
+
+    SUBCASE("external enums") {
+        using ee = external_ns::external_enum;
+        static_assert(enum_hpp::to_string(ee::a) == "a");
+        static_assert(enum_hpp::from_string<ee>("c") == ee::c);
+    }
 }

untests/enum_tests.cpp

@@ -82,6 +82,10 @@ TEST_CASE("enum") {
                 std::underlying_type_t<sn::color>,
                 unsigned>);
 
+            STATIC_CHECK(std::is_same_v<
+                sn::color_traits::enum_type,
+                sn::color>);
+
             STATIC_CHECK(std::is_same_v<
                 sn::color_traits::underlying_type,
                 enum_hpp::underlying_type<sn::color>>);