吕梁网站设计,服务器网站建设维护合同,制作网页的心得,河南省大型项目建设办公室网站实现的目的#xff1b;提高 C/C 编译速度#xff0c;fmt 库模板嵌套过多编译速度非常慢#xff0c;且编译后程序体积也过大#xff0c;函数步入的栈帧过多#xff01;
只支持格式#xff1b;{}
不支持格式#xff1b;{:02x}
class fmt
{
public:template typenam…实现的目的提高 C/C 编译速度fmt 库模板嵌套过多编译速度非常慢且编译后程序体积也过大函数步入的栈帧过多
只支持格式{}
不支持格式{:02x}
class fmt
{
public:template typename S, typename ...Tstatic std::string format(const S fmt, T ... args) noexcept{std::string str;if constexpr (std::is_sameS, std::string::value){str fmt;}else if constexpr (std::is_sameS, std::string_view::value){str std::string(fmt.data(), fmt.size());}else{str fmt;}(..., format_string(str, args));return str;}template typename OutputIt, typename ...Tstatic void format_to(OutputIt out, const std::string fmt, T ... args){std::string result format(fmt, std::forwardT(args)...);for (char ch : result){*out ch;}}private:template typename Tstatic std::string to_string(const T value) noexcept{if constexpr (std::is_sameT, bool::value){return value ? true : false;}else if constexpr (std::is_pointerT::value){using DECAY_T typename std::decayT::type;if constexpr (std::is_samechar*, DECAY_T::value || std::is_sameconst char*, DECAY_T::value){return value ? value : ;}else {if (value){char buf[sizeof(value) 2];snprintf(buf, sizeof(buf), %p, reinterpret_castconst void*(value));return buf;}return null;}}else if constexpr (std::is_sameT, std::string::value){return value;}else if constexpr (std::is_sameT, std::string_view::value){return std::string(value.data(), value.size());}else{return std::to_string(value);}}template typename Tstatic std::string to_string(const std::shared_ptrT value) noexcept{return fmt::to_string(value.get());}template typename Tstatic void format_string(std::string out, const T value) noexcept{replace_string(out, {}sv, fmt::to_string(value));}public:static bool replace_string(std::string str, const std::string_view old_string, const std::string_view new_string) noexcept;
};inline bool fmt::replace_string(std::string str, const std::string_view old_string, const std::string_view new_string) noexcept
{size_t pos str.find(old_string);if (pos std::string::npos){return false;}str.replace(pos, old_string.length(), new_string);return true;
}
