c++ 标准库实现字符串格式化

#include 
#include 
//字符串格式化
template 
std::string StrFormat(const char* format, Args... args)
{
  int length = std::snprintf(nullptr, 0, format, args...);
  if (length <= 0)
  {
    return "";
  }

  char* buf = new char[length + 1];
  std::snprintf(buf, length + 1, format, args...);

  std::string str(buf);
  delete[] buf;
  return std::move(str);
}

int main()
{
  std::string t = StrFormat("this is a %s and %d", "hello", 1);
  std::cout << t << std::endl;
}