C++ removing certain symbol/punctuation

Question

token.erase(std::remove_if(token.begin(), token.end(), ispunct), token.end()); It seems that using ispunct will remove all punctuation. Is it possible to only remove certain types? For example if I want to remove all punctuation except, for example colon? Or do you have to write your own condition in that case?

Answer 1

Use a lambda (or a callable object) as the predicate of your token.erase(...) call:

token.erase(
    std::remove_if(
        token.begin(), 
        token.end(), 
        [](char x){ return ispunct(x) && x != ':'; }), 
    token.end());