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Replace multiple pair of characters in string

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情书的邮戳
情书的邮戳 2021-01-14 08:37

I want to replace all occurrence of \'a\' with \'b\', and \'c\' with \'d\'.

My current solution is:

std::replace(str.begin(), str.end(), \'a\', \'b\'
2条回答
  • 臣服心动
    臣服心动 (楼主)
    2021-01-14 09:06

    Tricky solution:

    #include 
#include 
#include 
#include 

int main() {
   char r; //replacement
   std::map rs = { {'a', 'b'}, {'c', 'd'} };
   std::string s = "abracadabra";
   std::replace_if(s.begin(), s.end(), [&](char c){ return r = rs[c]; }, r);
   std::cout << s << std::endl;
}

    Edit

    To please all efficiency radicals one can change the solution, to not to append rs map for each non existing key, while remain tricky flavor untouched. This can be done as follows:

    #include 
#include 
#include 
#include 

int main() {
   char r; //replacement
   std::map rs = { {'a', 'b'}, {'c', 'd'} };
   std::string s = "abracadabra";
   std::replace_if(s.begin(), s.end(), [&](char c){ return (rs.find(c) != rs.end())
                                                        && (r = rs[c]); }, r); 
   std::cout << s << std::endl; //bbrbdbdbbrb
}

    [live demo]

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