被C++的format string困扰了蛮久,看到了一个还不错的实现,分享下: 主要是通过snprintf得到format string的长度。 #include <iostream> #include <memory> using namespace std; template<typename ... Args> string string_format(const string& format, Args ... args){ size_t size = 1 + snprintf(nullptr...
std::string的format实现方式 template< typename... Args >std::stringstring_sprintf(constchar*format, Args... args) {intlength = std::snprintf(nullptr,0, format, args...);if(length <=0) {return""; }char* buf =newchar[length +1]; std::snprintf(buf, length+1, format, args...); ...
int len = std_string_format(std_str, "hello %s!", "world"); std::cout << "std_str=" << std_str << ", len=" << len << std::endl; std::wcout.imbue(std::locale("chs")); std::wstring std_wstr; len = std_wstring_format(std_wstr, L"你好 %s!", L"世界"); std::w...
std::string的format实现方式 template< typename... Args >std::stringstring_sprintf(constchar*format, Args... args) {intlength = std::snprintf(nullptr,0, format, args...);if(length <=0) {return""; }char* buf =newchar[length +1]; std::snprintf(buf, length+1, format, args...); ...
std::string format(constchar*pszFmt, ...) { std::string str; va_listargs; va_start(args, pszFmt); { intnLength = _vscprintf(pszFmt, args); nLength += 1;//上面返回的长度是包含\0,这里加上 std::vector<char> chars(nLength); ...
Now std::format and fmtlib are equivalent when using spdlog with either. sylveon added 4 commits November 10, 2022 23:26 Support compile-time format string checking with std::format Unverified 127f55d Fix pre-VS 17.5 compilation Unverified 17f441e Fix compilation without wchar_t support ...
basic_format_string<wchar_t, std::type_identity_t<Args>...>; (3) (since C++20) Class template std::basic_format_string wraps a std::basic_string_view that will be used by formatting functions. The constructor of std::basic_format_string performs compile-time format string checks unless...
std::string s = format("string %d %f %s", i, f, s); ostream用起来很笨拙,而且效率低下,boost::format很强大,不过这么简单的东西就没必要动用boost这个庞然大物了... std::string format( const char * format, ...) { char buf[1024]; ...
问c++转换fmt::format_string<Args...>to std::string_viewENC++20 正式发布已经有一段时间了。其中...
std::string format(const RooCmdArg& formatArg) const ; std::string format(Int_t sigDigits, const char *options) const ; static void printScientific(bool flag=false) ; static void printSigDigits(Int_t ndig=5) ;4 changes: 2 additions & 2 deletions 4 roofit/roofitcore/src/RooAbsCollectio...