std::string debug function

Hello,

I'm trying to write a debug functions for my application so I can see all the values I like to.

My goal is it looks like this:

Code:

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void Debug(std::message, ...)

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So that I can call it like this:

Code:

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Debug("Error: %i, %i", 34, 35);

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I've no idea how I can work with %i, or if there are better solutions.

This is what I've so far (not much), just a basic idea:

Code:

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void Debug( std::string message, ...)
{
        va_list list;

        va_start(list, message);

          ??? va_arg(list, ??  );

        va_end(list);
        // here message shoul contain everything and be ready for output ?
        cout << message << endl;
}

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Greetz

Why not just forward the call to sprintf / fprintf?

Quote:

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Originally Posted by NLscotty

Hello,

I'm trying to write a debug functions for my application so I can see all the values I like to.

My goal is it looks like this:

Code:

---

void Debug(std::message, ...)

---

---

That code is ill-formed. For a function that has ellipses (...), the argument to the left of the ellipses must be a POD type. So forget about it.

Use sprintf(), std::ostringstream(), or boost::format from the boost library.

Regards,

Paul McKenzie

Is this what you are looking for?

Code:

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#include <iostream>
#include <Windows.h>

inline void Trace( const char* format , ... )
{
#ifndef NDEBUG
        char buffer[ 0x400 ];
        va_list  fmt_list;

        va_start( fmt_list, format );
        vsprintf_s( buffer, 0x400, format, fmt_list );
        va_end( fmt_list );
        strcat_s( buffer, 0x400 ,"\n" );

        // ::OutputDebugString( buffer );
        std::cout << buffer;
#endif // NDEBUG
}


int main()
{
        Trace( "Error: %i , %i" , 34 , 35 );
}

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