文章目录 1 C++ std::string字符串格式化 1.1 C语言中的字符串格式化 1.2 C++使用std::stringstream进行字符串格式化 1.3 开源的C++单个头文件的字符串格式化工具 1.3.1 format 1.3.2 sformat 1.4 自定义的C++字符串格式化函
主要是通过snprintf得到format string的长度。 #include<iostream>#include<memory>usingnamespacestd;template<typename...Args>stringstring_format(conststring&format,Args...args){size_tsize=1+snprintf(nullptr,0,format.c_str(),args...);// Extra space for \0// unique_ptr<char[]> buf(new char[si...
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...); ...
于是我在VS下敲下了如下代码: #include<iostream>#include<string>#include<stdarg.h>intstd_string_format(std::string&str,constchar*format,...){std::string tmp;va_list marker;va_start(marker,format);size_t num=_vscprintf(format,marker);if(num>=tmp.capacity())tmp.reserve(num+1);vsprintf_...
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]; ...
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); ...
int main() { int i{ 0 }; // The format parameter is a char[] / wchar_t[]: const std::string title1 = string_format("story[%d].", ++i); // => "story[1]" const std::wstring title2 = string_format(L"story[%d].", ++i); // => L"story[2]" // If you already ...
std::string test = util::Format("This is a nice string with numbers {0} and strings {1} nicely formatted", 123, "hello"); std::string test = util::Format("{0, 20}", "Formatting is nice!");About A simple header-only C++11 std::string formatter Resources Readme Activity ...
num2str(A, format) 2019-12-20 19:58 −str = num2str(A, format)A: 数值类型的数组或者是单个的数值format:指定数字转换为字符串的格式,通常’%11.4g’是默认的。也可以指定转换为几位的字符串,不足用0填充,如%02d%03d等... 一杯明月 0
#include<string>#include<fmt/core.h>inlinevoidf() { (void)fmt::format("{}",std::string()); } #include<fmt/format.h>intmain() {} The error can be reproduced usingg++ -std=gnu++20 fmt-err.cppandc++20, but notgnu++17and below, and not usingclang++withgnu++20orgnu++17. ...