formatter.hpp

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# /*
#  * Created by YongGyu Lee on 2020/12/08.
#  */
#
# ifndef VCCC_LITERAL_FORMATTER_HPP
# define VCCC_LITERAL_FORMATTER_HPP
#
# include <string>
# include <vector>
# include <cstdio>
 
namespace vccc {
 
 
class Formatter {
 public:
  explicit Formatter(const char *format) : format(format), buffer(30) {}
 
  template<typename ...Args>
  inline std::string operator()(const Args& ...args) {
    auto size = snprintf(NULL, 0, format, args...);
    if (buffer.size() < size + 1)
      buffer.resize(size + 1);
    snprintf(buffer.data(), size + 1, format, args...);
    return std::string(buffer.data());
  }
 
 private:
  const char *format;
  std::vector<char> buffer;
};
 
 
inline Formatter operator "" _format(const char *format, std::size_t) {
  return Formatter(format);
}
 
 
} // namespace vccc
 
# endif // VCCC_LITERAL_FORMATTER_HPP