implement stringify for std::nullopt_t

catchorg · Aug 30, 2023 · a62dcc9 · a62dcc9
1 parent f24d39e
commit a62dcc9
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diff --git a/src/catch2/catch_tostring.hpp b/src/catch2/catch_tostring.hpp
@@ -398,6 +398,12 @@ namespace Catch {
             }
         }
     };
+    template <>
+    struct StringMaker<std::nullopt_t> {
+        static std::string convert(const std::nullopt_t&) {
+            return "{ }";
+        }
+    };
 }
 #endif // CATCH_CONFIG_ENABLE_OPTIONAL_STRINGMAKER
 

diff --git a/tests/SelfTest/UsageTests/ToStringOptional.tests.cpp b/tests/SelfTest/UsageTests/ToStringOptional.tests.cpp
@@ -28,4 +28,8 @@ TEST_CASE( "std::vector<std::optional<int> > -> toString", "[toString][optional]
     REQUIRE( "{ 0, { }, 2 }" == ::Catch::Detail::stringify( type{ 0, {}, 2 } ) );
 }
 
+TEST_CASE( "std::nullopt -> toString", "[toString][optional][approvals]" ) {
+    REQUIRE( "{ }" == ::Catch::Detail::stringify( std::nullopt ) );
+}
+
 #endif // CATCH_INTERNAL_CONFIG_CPP17_OPTIONAL