在字符串C ++ Boost问题中替换空格

本文介绍了在字符串C ++ Boost问题中替换空格的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在使用此代码替换while空间，但它永远不会替换所有空白，您能告诉我我错了吗

i am using this code to replace the while space but it never replaces all the white space can u please tell me where i am wrong

#include <iostream> #include <string> #include <boost/regex.hpp> #include<boost/algorithm/string.hpp> #include<boost/algorithm/string/replace.hpp> using namespace std; int main(void) { string s4="Hai ad asdasd asdasd"; cout << boost::algorithm::replace_all_copy(s4, " ", " "); }

推荐答案

如果要用单个空格替换任意数量的空格，则可以使用标准的unique(_copy)算法来做到这一点:

If the idea is to replace any number of spaces with a single space, then the standard unique(_copy) algorithm can be tricked to do that:

#include <iostream> #include <string> #include <algorithm> #include <iterator> #include <boost/lambda/lambda.hpp> std::string remove_excessive_spaces(const std::string& s) { using namespace boost::lambda; std::string result; //consider consequtive chars equal only if they are both spaces. unique_copy(s.begin(), s.end(), back_inserter(result), _1 == ' ' && _2 == ' '); return result; } int main(void) { std::string s4="Hai ad asdasd asdasd"; std::cout << remove_excessive_spaces(s4); }