Function name macros which work accross compilers

Question

There are preprocessor macros which define the name of a function inside it, __func__ for g++ and __FUNCTION__ for cl. (func is the c++ standard way of doing this (from dcl.fct.def.general) but it is not implmented everywhere)

For source which will be compiled by both of these compilers what should I do?

I have tried

#ifdef __func__
#define FUNCTION_NAME __func__
#else
#ifdef __FUNCTION__
#define FUNCTION_NAME __FUNCTION__
#else
#error "Function name macro not found"
#endif
#endif

but as it is not in a function the macros are not defined.

I have also tried

void implementation_detail() {
#ifdef __func__
#define FUNCTION_NAME __func__
#else
#ifdef __FUNCTION__
#define FUNCTION_NAME __FUNCTION__
#else
#error "Function name macro not found"
#endif
#endif
}

but that also gives an error.

How can I do this so it will work in multiple compliers?

#elseifdef is not a standard preprocessor directive. If you're looking for something cross-compiler, don't use a compiler-specific extension here. You'll either have to do a nested #else-#ifdef, or factor things differently. — Joe Z
– Joe Z, Commented Nov 27, 2013 at 14:20
The __func__ macro is defined in the C++ standard and as such it is a real shame that it doesn't seem to work with all compilers. — Agentlien
– Agentlien, Commented Nov 27, 2013 at 14:21
@Agentlien I had a look in my copy, but I made the mistake of looking under 16 Preprocessing directives. I'll update with this info. — davidcorne
– davidcorne, Commented Nov 27, 2013 at 15:45
@JoeZ Thanks, I didn't realise that was non-standard I'll change it — davidcorne
– davidcorne, Commented Nov 27, 2013 at 15:46

davidcorne · Accepted Answer · 2013-11-27 16:02:21Z

3

I have found that there is a boost macro for this, BOOST_CURRENT_FUNCTION.

From looking at the source code here how this is implemented is they use an inline function like so.

inline void current_function_helper()
{

#if defined(__GNUC__) || (defined(__MWERKS__) && (__MWERKS__ >= 0x3000)) || (defined(__ICC) && (__ICC >= 600)) || defined(__ghs__) || defined(__DMC__)`
...

(also it is declared in a namespace called detail which is very wise)

I will use this.

EDIT: implementing __func__ will be in the Visual Studio customer technology preview out now, see here.

edited Nov 27, 2013 at 16:02

answered Nov 27, 2013 at 14:18

davidcorne

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