CODEWITHSUNDEEP
c++c++11
lukas.pukenis
lukas.pukenis

Reputation: 13597

C++ macro to get full function path and declaration

I want to get full function path and declaration in code via macro or some compiler magic. I have this code (click here to run):

#include <iostream>

namespace NS {

    struct Foo {
        static int sum(int a, int b) {
            std::cout << "This is from " << __FILE__ << ":" << __LINE__ << " @ " <<     __func__ << std::endl;
            return a+b;
        }

        static int sum(int a, int b, int c) {
            std::cout << "This is from " << __FILE__ << ":" << __LINE__ << " @ " <<     __func__ << std::endl;
            return a+b+c;
        }

   };
}

int main() {
    NS::Foo::sum(1,2);
    NS::Foo::sum(1,2, 3);
}

And I get the output:

This is from /some/where/main.cpp:7 @ sum
This is from /some/where/main.cpp:12 @ sum

My questions are:

I am interested in mainstream compilers: Clang, GCC, Microsoft C++ compiler

Upvotes: 0

Views: 426

Answers (3)

eerorika
eerorika

Reputation: 238361

If you don't want to limit yourself to a single compiler, and don't fancy writing a pre-processor ifdef chain yourself, boost has already defined a macro BOOST_CURRENT_FUNCTION which is defined as the full function signature macro that's defined on the used compiler. __PRETTY_FUNCTION__ in gcc and other compilers that support that, __FUNCSIG__ where that is supported (msvc), also supports some lesser used compilers and falls back to __func__ as defined by the C standard (or a static placeholder if even that's not supported).

Upvotes: 2

Zereges
Zereges

Reputation: 5209

For Microsoft Visual Studio compiler, __FUNCSIG__ can give you a lot about the function.

__FUNCSIG__ will give you full function signature
__FUNCDNAME__ gives magnled name.
__FUNCTION__ is just for function name.

Upvotes: 3

Oleg Andriyanov
Oleg Andriyanov

Reputation: 5279

Answering for GCC.

Checkout the __PRETTY_FUNCTION__ macro. I've found it in the defintion of assert macro in <assert.h>. Perhaps same could be found for other compilers and libc implementations.

Upvotes: 3

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