C++ 字符串格式化函数实现

wlib/general.h

#pragma once


using namespace std;


#define IS_DEBUG_MODE    1
#if  IS_DEBUG_MODE  
#define  DEBUG(text)  debug(text)
#define  DEBUG_EX(text,end)  debug(text,end)
#else 
#define  DEBUG(str) 
#define  DEBUG_EX(text,end)  
#endif

void debug(
    const char *  text,
    const char * end = "\n"
);

void debug(
    string text,
    const char * end = "\n"
);

string stringf(
    const char *  text,
    ...
);

wlib/general.cpp

#include <iostream>
#include <windows.h>

//#include <stdio.h>
//#include <stdlib.h>
//#include <stdarg.h>
//#include <string>
#include <regex>

using namespace std;

void debug(
    const char *  text,
    const char * end = "\n"
)
{
    OutputDebugStringA((text + string(end)).c_str());
}

void debug(
    string text,
    const char * end = "\n"
)
{
    debug(text.data(), end);
}


string stringf
(
    const char *  text,
    ...
)
{
    va_list args_ptr;
    va_start(args_ptr, text);

    string text_s = (string)text;
    regex reg(R"---(\{\d+\})---");
    sregex_iterator begin(text_s.begin(), text_s.end(), reg);
    sregex_iterator end;

    string ret_text(text);
    {
        int offset = 0;
        int i = 0;
        char* arg;
        for (sregex_iterator it = begin; it != end; ++it)
        {
            if (it->str() != string("{") + to_string(i) + string("}")) {
                throw string("wrong format ({") + to_string(i) + string("})");
            }
            arg = va_arg(args_ptr, char*);

            ret_text = ret_text.replace(it->position()+ offset, it->length(), arg);
            offset += strlen(arg) - it->length();
            ++i;
        }
    }

    //smatch match;
    //bool matched = regex_search(text_s, match, reg); //有误

    //string ret_text(text);
    //cout << match.size() << endl;
    //for (int i = 0; i < match.size(); i++) {
    //  if (match.str(i) != string("{") + to_string(i) + string("}")) {
    //      throw string("wrong format ({") + to_string(i) + string("})");
    //  }
    //  ret_text = ret_text.replace(match.position(i), match.length(i), va_arg(args_ptr, char*));
    //}
    va_end(args_ptr);
    return ret_text;
}

main.cpp

#include <iostream>
#include <windows.h>

#include <stdio.h>
//#include <stdlib.h>
#include <stdarg.h>

#include "wlib/general.h"
#include <string>

int main(int argc, char *argv[])
{
    for (int i = 0; i < argc; i++) {  
        DEBUG(stringf("命令行参数 {0} ：{1} ", to_string(i).data(), argv[i]));
    }

    DEBUG(stringf("hello world {0} a {1} !", "cpp", "hhh"));

}