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  1. #include <cstdio>
  2. #include <cstdarg>
  3. #include <iostream>
  4.  
  5. class Logger
  6. {
  7. public:
  8.     Logger(){}
  9.     ~Logger(){}
  10.  
  11.     void info(const char* messageFormat, ...)
  12.     {
  13.         va_list args;
  14.         va_start(args, messageFormat);
  15.         std::string infoFormat = this->format<512>("[INFO] %s", messageFormat).c_str();
  16.         vlog(infoFormat.c_str(), args);
  17.         va_end(args);
  18.     }
  19.  
  20.     void vlog(const char* format, va_list args)
  21.     {
  22.         std::string logMessage = vFormat<512>(format, args);
  23.         std::cout<<logMessage<<std::endl;
  24.     }
  25.  
  26.     template <size_t BufferSize>
  27.     std::string format(const char* format, ...)
  28.     {
  29.         va_list args;
  30.         va_start(args, format);
  31.         std::string message = vFormat<BufferSize>(format, args).c_str();
  32.         va_end(args);
  33.         return message;
  34.     }
  35.  
  36.     template <size_t BufferSize>
  37.     std::string vFormat(const char* format, va_list args)
  38.     {
  39.         char buffer[BufferSize];
  40.         vsprintf(buffer, format, args);
  41.         return std::string(buffer);
  42.     }
  43. };
  44.  
  45. int main()
  46. {
  47.     Logger log;
  48.     log.info("This is a test with no args!");
  49.     log.info("This is a %s with args!", "test");
  50.     int n = 3;
  51.     double dVal = 22.0/7.0;
  52.     log.info("This is a test with %d args (double: %f, string: '%s')", n, dVal, "testString");
  53.     return 0;
  54. }
Success #stdin #stdout 0.01s 2812KB
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stdin
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Standard input is empty
stdout
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[INFO] This is a test with no args!
[INFO] This is a test with args!
[INFO] This is a test with 3 args (double: 3.142857, string: 'testString')
https://ideone.com/itUR6X
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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