Cfrgtkky

I am trying to auto generate a string that can be used in debug logs, the syntax I would like is:

    ClassName::FunctionName

The source code can be used on two systems with different compilers, this includes:

    Microsoft Visual Studio 2010, Version 10.0.40219.1 SP1Rel

and

    QNX Momentics, Version 4.7

I've tried this so far:

    #if defined(__FUNCDNAME__)

      #define FNAME    __FUNCDNAME__

    #elif defined(__FUNCTION__)

      #define FNAME    __FUNCTION__

    #elif defined(__FUNSIG__)

      #define FNAME    __FUNSIG__

    #elif defined(__func__)

      #define FNAME    __func__

    #elif defined(__PRETTY_FUNCTION__)

      #define FNAME    __PRETTY_FUNCTION__

    #else

      #define FNAME    ""

    #endif

I then added a bit of test code so I could see the result in the debugger:

    char szTemp[128];

    strcpy_s(szTemp, sizeof(szTemp), FNAME);

The result is not what I am after:

    ??0CLSNAME@@QAE@AAV?$SecBlock@EV?$AllocatorWithCleanup@ES0A@@@@@@0_N@Z

I have no idea what this is.

[Edit] I Changed the pre-processor's to give me a bit more visibility as to what is happening, now the code reads:

    szFrom[0] = '';

    #if defined(__PRETTY_FUNCTION__)

      #define FNAME    __PRETTY_FUNCTION__

      strcpy_s(szFrom, sizeof(szFrom), FNAME);

    #endif

    #if defined(__FUNCTION__)

      #define FNAME    __FUNCTION__

      strcpy_s(szFrom, sizeof(szFrom), FNAME);

    #endif

    #if defined(__FUNCDNAME__)

      #define FNAME    __FUNCDNAME__

      strcpy_s(szFrom, sizeof(szFrom), FNAME);

    #endif

    #if defined(__FUNSIG__)

      #define FNAME    __FUNSIG__

      strcpy_s(szFrom, sizeof(szFrom), FNAME);

    #endif

    #if defined(__func__)

      #define FNAME    __func__

      strcpy_s(szFrom, sizeof(szFrom), FNAME);

    #endif

When using MSVC I can see the flow and ugly output comes from FUNCDNAME which is the only condition that the flow goes into.

[Edit 2] Final working solution:

    szFrom[0] = '';

    #if defined(__PRETTY_FUNCTION__)

      #define FNAME    __PRETTY_FUNCTION__

      strcpy_s(szFrom, sizeof(szFrom), FNAME);

    #endif

    #if defined(__FUNCTION__)

      #define FNAME    __FUNCTION__

      strcpy_s(szFrom, sizeof(szFrom), FNAME);

    #endif

    #if defined(__FUNSIG__)

      #define FNAME    __FUNSIG__

      strcpy_s(szFrom, sizeof(szFrom), FNAME);

    #endif

    #if defined(__func__)

      #define FNAME    __func__

      strcpy_s(szFrom, sizeof(szFrom), FNAME);

    #endif

On MSVC this gives the output:

    ClassName::FunctionName

Thanks go to P.W.

If you want to print in the format ClassName::FunctionName in Visual Studio, __FUNCTION__ is the most suitable. So you will have to put it first in your hierarchy of conditional inclusions (#ifdefs).

#if defined(__FUNCTION__)

    #define FNAME    __FUNCTION__

...

...

#else

    #define FNAME    ""

#endif

You can see it live here.

Which you is called decorated name. The name decorations c++ specific thing.
It is need for the linker, which except unique names. But In c++ the two or more function can have same name. This is calling function overloading.

Example:

class

{

    void Function()

    void Function( int i )

    void Function( string s)

}

this is valid code. So the compiler decorated the function names, based on the parameter list and the contains class name. So we give the unique name after the decoration mechanism.

here is an article:
https://msdn.microsoft.com/en-us/library/56h2zst2.aspx