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  1. #include <cstdio>
  2. #include <cstdarg>
  3. #include <functional>
  4.  
  5. class PrintWrapper
  6. {
  7.  
  8.     public:
  9.     PrintWrapper()  = default;
  10.  
  11.  
  12.     template<typename T>
  13.     PrintWrapper( T&& t)  : func(std::forward<T>(t))
  14.     {
  15.  
  16.     }
  17.  
  18.  
  19.     int operator()(char const* format, ...)
  20.     {
  21.         va_list args;
  22.         va_start(args, format);
  23.         int result = func(format, args);
  24.         va_end(args);
  25.         return result;
  26.     }
  27.     private:
  28.  
  29.     std::function< int(char const*, va_list)> func;
  30.  
  31. };
  32.  
  33. int main()
  34. {
  35.     // Note, you have to use the 'v' versions
  36.     PrintWrapper p = std::vprintf;
  37.     p("%d %d %s\n", 1,2, "hello");
  38.     char buffer[256];
  39.     using namespace std::placeholders;
  40.     p = std::bind(std::vsnprintf, buffer, sizeof(buffer), _1, _2 );
  41.  
  42.     p("%lf %s\n", 0.1234, "goodbye");
  43.  
  44.     // Since the previous step was a wrapper around snprintf, we need to print
  45.     // the buffer it wrote into
  46.     printf("%s\n", buffer);
  47.  
  48.     return 0;
  49. }
Success #stdin #stdout 0s 3472KB
comments (?)
stdin
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Standard input is empty
stdout
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1 2 hello
0.123400 goodbye
https://ideone.com/Sc95ch
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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