Macro / keyword which can be used to print out method name?

Question

__FILE__ and __LINE__ are well known. There is a __func__ since C99.

#include <iostream>
struct Foo {
        void Do(){ std::cout << __func__ << std::endl; }
};

int main()
{
        std::cout << __func__ << std::endl;
        Foo foo; foo.Do();
        return 0;
}

will output

main
Do

Is there any macro / keyword that would output method name like Foo::Do?

Answer 1

Not in Standard C++ (and __func__ is not part of C++). Your implementation may have such a feature though - which compiler are you using?

Answer 2

See "Predefined Macros (C/C++)" for a complete list supported by MS Visual Studio.

Answer 3

• On GCC you can use __FUNCTION__ and __PRETTY_FUNCTION__.
• On MSVC you can use __FUNCSIG__ and __FUNCTION__.

Answer 4

There's no such macro in standard C++, and that includes the draft C++0x standard I looked at. It would complicate compilation, since parsing (necessary to determine what a function is) comes after preprocessing, and I suspect that's why there's nothing in the standard.

The __func__ you're using is nonstandard, although it apparently works on your compiler.

Answer 5

Boost has a special utility macro called BOOST_CURRENT_FUNCTION that hides the differences between the compiler implementations.

Following it's implementation we see that there are several macros depending on compiler:

• __PRETTY_FUNCTION__ -- GCC, MetroWerks, Digital Mars and ICC
• __FUNCSIG__ -- MSVC
• __FUNCTION__ -- Intel and IBM
• __FUNC__ -- Borland
• __func__ -- ANSI C99