/C++/Convert all strings in vector to lowercase or uppercase c++

Convert all strings in vector to lowercase or uppercase c++

for(std::string &s : stringVector){
    std::transform(s.begin(), s.end(), s.begin(), 
        [](char c){ return std::toupper(c); }); // for lowercase change "toupper" -> "tolower" 
}

Source: codereview.stackexchange.com

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