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#include <iostream>
#define MACRO(y, x) void _func_##x() { \
	some.##y.func_##x(); \
}
 
class first
{
	public:
	void func_example(const char* str)
	{
		std::cout << str;
	}
};
 
class second
{
	public:
	first othersome; 
} some;
 
MACRO(othersome, example);
 
int main()
{
	_func_example("Hello, World!");
 
	return 0;
}

prog.cpp:3:6: error: pasting "." and "othersome" does not give a valid preprocessing token
  some.##y.func_##x(); \
      ^
prog.cpp:21:1: note: in expansion of macro ‘MACRO’
 MACRO(othersome, example);
 ^
prog.cpp: In function ‘void _func_example()’:
prog.cpp:3:20: error: no matching function for call to ‘first::func_example()’
  some.##y.func_##x(); \
                    ^
prog.cpp:21:1: note: in expansion of macro ‘MACRO’
 MACRO(othersome, example);
 ^
prog.cpp:3:20: note: candidate is:
  some.##y.func_##x(); \
                    ^
prog.cpp:21:1: note: in expansion of macro ‘MACRO’
 MACRO(othersome, example);
 ^
prog.cpp:9:7: note: void first::func_example(const char*)
  void func_example(const char* str)
       ^
prog.cpp:9:7: note:   candidate expects 1 argument, 0 provided
prog.cpp: In function ‘int main()’:
prog.cpp:25:31: error: too many arguments to function ‘void _func_example()’
  _func_example("Hello, World!");
                               ^
prog.cpp:2:26: note: declared here
 #define MACRO(y, x) void _func_##x() { \
                          ^
prog.cpp:21:1: note: in expansion of macro ‘MACRO’
 MACRO(othersome, example);
 ^

Standard output is empty