字符串操作

格式化字符串

std::string str_format(const char* fmt,...);

std::string str_format(const char* fmt, ...)

{

va_list ap;

va_start(ap, fmt);

const size_t SIZE = 512;

char buffer[SIZE] = { 0 };

vsnprintf(buffer, SIZE, fmt, ap);

va_end(ap);

return std::string(buffer);

}