Add another CallOnMembers

Author: Yaraslau Tamashevich

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.10)
-project(reflection-cpp VERSION 0.3.0 LANGUAGES CXX)
+project(reflection-cpp VERSION 0.3.1 LANGUAGES CXX)
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

include/reflection-cpp/reflection.hpp

@@ -1264,12 +1264,19 @@ constexpr void EnumerateMembers(Callable&& callable)
 }
 
 template <typename Object, typename Callable>
-    requires std::same_as<void, std::invoke_result_t<Callable, std::string, MemberTypeOf<0, Object>>>
+    requires std::is_invocable_v<Callable, std::string, MemberTypeOf<0, Object>>
 void CallOnMembers(Object& object, Callable&& callable)
 {
     EnumerateMembers(object, [&]<size_t I, typename T>(T&& value) { callable(MemberNameOf<I, Object>, value); });
 }
 
+template <typename Object, typename Callable>
+  requires std::is_invocable_v<Callable, MemberTypeOf<0, Object>>
+void CallOnMembers(Object& object, Callable&& callable)
+{
+  EnumerateMembers(object, [&]<size_t I, typename T>(T&& value) { callable.template operator()<I>(value); });
+}
+
 /// Folds over the members of a type without an object of it.
 ///
 /// @param initialValue The initial value to fold with

test-reflection-cpp.cpp

@@ -78,6 +78,11 @@ TEST_CASE("single value record", "[reflection]")
         CHECK(name == "value");
         CHECK(value == 42);
     });
+
+    Reflection::CallOnMembers(s, []<size_t I, typename T>(T&& value) {
+        CHECK(I == 0);
+        CHECK(value == 42);
+    });
 }
 
 TEST_CASE("core", "[reflection]")