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?

Cannot decide on the best answer. I click something, and I apologize to the rest :-). — Notinlist, Feb 03 '10 at 14:58
related: http://stackoverflow.com/questions/4384765/whats-the-difference-between-pretty-function-function-func — Ciro Santilli OurBigBook.com, Feb 18 '16 at 12:56

score 93 · Accepted Answer · edited Apr 25 '13 at 13:05

93

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, ICC, MinGW
__FUNCSIG__ -- MSVC
__FUNCTION__ -- Intel and IBM
__FUNC__ -- Borland
__func__ -- ANSI C99

edited Apr 25 '13 at 13:05

Narek

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answered Feb 03 '10 at 14:52

Kornel Kisielewicz

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+1 for presenting a solution that works on multiple platforms – Matthieu M. Feb 03 '10 at 15:26
+1. This is an excellent solution. I hadn't discovered this yet. – Fred Larson Feb 03 '10 at 15:33
the problem with Boost is that often times it has solutions for things you did not even thought about. I did not think it was "possible" and therefore I did not try to look it up... – Matthieu M. Feb 04 '10 at 07:31
2

One more option: Q_FUNC_INFO if one uses Qt. – Wildcat Aug 22 '13 at 08:15

score 10 · Answer 2 · answered Feb 03 '10 at 14:47

10

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

answered Feb 03 '10 at 14:47

rpg

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`__PRETTY_FUNCTION__` is awesome! Will test `__FUNCSIG__` later. – Notinlist Feb 03 '10 at 14:52

score 3 · Answer 3 · answered Feb 03 '10 at 14:50

3

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.

answered Feb 03 '10 at 14:50

David Thornley

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This is of course nonsense as it can insert an implementation defined runtime function. Preprocessor String concatanation would then impossible but it's not allowed for other preprocessor symbols either. – Lothar Jan 18 '15 at 02:41

score 1 · Answer 4 · answered Feb 03 '10 at 14:44

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?

answered Feb 03 '10 at 14:44

I'm interested in g++ and MSVC++ too. – Notinlist Feb 03 '10 at 14:53

score 1 · Answer 5 · answered Feb 03 '10 at 14:45

1

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

answered Feb 03 '10 at 14:45

Ruddy

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That document lives here, now: https://learn.microsoft.com/en-us/cpp/preprocessor/predefined-macros – adam_0 Feb 14 '18 at 22:03

score 0 · Answer 6 · answered May 08 '14 at 10:27

This might be useful:

http://gcc.gnu.org/onlinedocs/gcc/Function-Names.html

#include"stdio.h"
#include"stdlib.h"
int main()
{
printf("line number is %d .. func name is %s, file name is %s",__LINE__,__PRETTY_FUNCTION__,__FILE__);
return  0;
}

This is how to print line number, function name and file name in gcc.

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

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