Create as_member_func in utility.h

src/rttr/rttr.cmake

@@ -51,6 +51,7 @@ set(HEADER_FILES access_levels.h
                  type
                  type.h
                  type_list.h
+                 utility.h
                  variant.h
                  variant_associative_view.h
                  variant_sequential_view.h

src/rttr/utility.h

@@ -0,0 +1,66 @@
+#ifndef RTTR_UTILITY_H_
+#define RTTR_UTILITY_H_
+
+namespace rttr
+{
+
+/**
+Register property getter with lambda function.
+
+@code
+int get_my_int(const MyClass& my_class);
+
+rttr::registration::class_<MyClass>("MyClass")
+    .property_readonly("my_int"
+        , rttr::as_member_func(+[](const MyClass* self) { return get_my_int(*self); })
+    )
+;
+@endcode
+*/
+template <typename Return, typename Class, typename... Args>
+auto as_member_func(Return(*func)(const Class*, Args...))
+{
+    union {
+        Return(Class::*member_func)(Args...) const;
+        void* func_ptr;
+    } convert;
+    convert.func_ptr = func;
+    return convert.member_func;
+}
+
+/**
+Register property setter with lambda function.
+
+@code
+class MyClass {
+public:
+    explicit MyClass(int my_int);
+
+    int& get();
+
+private:
+    int my_int;
+};
+
+rttr::registration::class_<MyClass>("MyClass")
+    .property("my_int"
+        , &MyClass::get,
+        , rttr::as_member_func(+[](MyClass* self, int my_int) { self->get() = my_int; })
+    )
+;
+@endcode
+*/
+template <typename Return, typename Class, typename... Args>
+auto as_member_func(Return(*func)(Class*, Args...))
+{
+    union {
+        Return(Class::*member_func)(Args...);
+        void* func_ptr;
+    } convert;
+    convert.func_ptr = func;
+    return convert.member_func;
+}
+
+} // end namespace rttr
+
+#endif // RTTR_UTILITY_H_