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  1. #pragma once
  2. #include <iostream> 
  3. #include <sstream>
  4. #include <cstdarg>
  5. #include <windows.h>
  6.  
  7. //usage: 
  8. //   DEBUGOUT("HI %s", username);
  9. //   DEBUGOUT << "HI " << username;
  10. //results:
  11. //   C:/users/dev/code/mpd/file_ptr.h(9): HI smith
  12. //   C:/users/dev/code/mpd/file_ptr.h(10): HI smith
  13. //double click a line to be taken directly to that line of code
  14.  
  15. __declspec(dllimport) void __stdcall OutputDebugStringA(_In_opt_ const char* lpOutputString);
  16. struct DebugOutBuffer {
  17.     DebugOutBuffer(const char* file, int line, bool enabled) 
  18.     {if (enabled) ss<<file<<'('<<line<<"): "; else ss.setstate(std::ios_base::badbit); }
  19.     ~DebugOutBuffer()
  20.     {if (ss) {ss<<'\n'; OutputDebugStringW(ss.str().c_str());}}
  21.  
  22.     operator std::wostream&() {return ss;}
  23.     template<class T> std::wostream& operator<<(T&& t) {return ss << t;}
  24.  
  25.     DebugOutBuffer& operator()(_In_z_ const char* text) 
  26.     {if (ss) ss<<text; return *this;}
  27.     template<class T, class enabled=typename std::enable_if<!std::is_same<T,va_list>::value>::type>
  28.     DebugOutBuffer& operator()(_In_z_ _Printf_format_string_ const char* format, T, ...) 
  29.     { 
  30.         if (!ss) return *this;
  31.         va_list arglist;
  32.         va_start(arglist, format);
  33.         operator()(format, arglist);
  34.         va_end(arglist);
  35.         return *this;
  36.     }
  37.     DebugOutBuffer& operator()(_In_z_ _Printf_format_string_ const char* format, va_list args) 
  38.     { 
  39.         if (!ss) return *this;
  40.         char buffer[1024];
  41.         va_list arglist;
  42.         va_start(arglist, format);
  43.         vsnprintf(buffer, 1024, format, args);
  44.         buffer[1023] = '\0';
  45.         ss<<buffer;
  46.         return *this;
  47.     }
  48.     DebugOutBuffer& operator()(_In_z_ const wchar_t* text) 
  49.     {if (ss) ss<<text; return *this;}
  50.     template<class T, class enabled=typename std::enable_if<!std::is_same<T,va_list>::value>::type>
  51.     DebugOutBuffer& operator()(_In_z_ _Printf_format_string_ const wchar_t* format, T, ...) 
  52.     { 
  53.         if (!ss) return *this;
  54.         va_list arglist;
  55.         va_start(arglist, format);
  56.         operator()(format, arglist);
  57.         va_end(arglist);
  58.         return *this;
  59.     }
  60.     DebugOutBuffer& operator()(_In_z_ _Printf_format_string_ const wchar_t* format, va_list args) 
  61.     { 
  62.         if (!ss) return *this;
  63.         wchar_t buffer[1024];
  64.         va_list arglist;
  65.         va_start(arglist, format);
  66.         _vsnwprintf(buffer, 1024, format, args);
  67.         buffer[1023] = '\0';
  68.         ss<<buffer;
  69.         return *this;
  70.     }
  71. private:
  72.     std::wostringstream ss;
  73. };
  74. #define DEBUGOUT DebugOutBuffer(__FILE__, __LINE__, true)
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.cpp:1:9: warning: #pragma once in main file
 #pragma once
         ^
prog.cpp:5:21: fatal error: windows.h: No such file or directory
 #include <windows.h>
                     ^
compilation terminated.
stdout
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Standard output is empty
https://ideone.com/dC3uil
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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