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编辑器加载中...

使用python的时候默认str 对字符串操作支持非常丰富，相信每个C++程序员都自己写过string的strim、split、replace，

写个小工具函数，留着用，以前偷懒，写了好几次，这次总结一下，贴出来。

 

#include 
     
       #include 
      
        using namespace std; namespace strtool {
   string trim(const string& str) {
        string::size_type pos = str.find_first_not_of(' ');     if (pos == string::npos)     {
            return str; }     string::size_type pos2 = str.find_last_not_of(' ');     if (pos2 != string::npos) {
           return str.substr(pos, pos2 - pos + 1); }     return str.substr(pos); } int split(const string& str, vector
       
        & ret_, string sep = ",") {
       if (str.empty())     {
            return 0; }     string tmp;     string::size_type pos_begin = str.find_first_not_of(sep);     string::size_type comma_pos = 0;     while (pos_begin != string::npos) {
           comma_pos = str.find(sep, pos_begin);         if (comma_pos != string::npos)         {
                tmp = str.substr(pos_begin, comma_pos - pos_begin);             pos_begin = comma_pos + sep.length(); }         else {
               tmp = str.substr(pos_begin);             pos_begin = comma_pos; }         if (!tmp.empty()) {
               ret_.push_back(tmp);             tmp.clear(); }     }     return 0; } string replace(const string& str, const string& src, const string& dest) {
       string ret;     string::size_type pos_begin = 0;     string::size_type pos       = str.find(src);     while (pos != string::npos)     {
            cout <<"replacexxx:" << pos_begin <<" " << pos <<"\n";         ret.append(str.data() + pos_begin, pos - pos_begin);         ret += dest;         pos_begin = pos + 1;         pos       = str.find(src, pos_begin); }     if (pos_begin < str.length()) {
           ret.append(str.begin() + pos_begin, str.end()); }     return ret; } } int main(int argc, char* argv[]) {
       cout << strtool::trim(" nihao ") <<"\n";     vector
        
          vt;     strtool::split(",o h,,,nice,,,,,,,", vt);     for (size_t i = 0; i < vt.size(); ++ i)     {
            cout <<"out:" << vt[i] <<"\n"; }     string ret = strtool::replace("xxAxxxAxxAxx", "A", "B");     cout <<"replace:" << ret <<"\n";     return 0; } 更多精彩文章