Replace multiple spaces with one space in a string

Question

How would I do something in c++ similar to the following code:

//Lang: Java
string.replaceAll(\"  \", \" \");

This code-snippe

Answer 1

So, I tried a way with std::remove_if & lambda expressions - though it seems still in my eyes easier to follow than above code, it doesn't have that "wow neat, didn't realize you could do that" thing to it.. Anyways I still post it, if only for learning purposes:

bool prev(false);
char rem(' ');
auto iter = std::remove_if(str.begin(), str.end(), [&] (char c) -> bool {
    if (c == rem && prev) {
        return true;
    }
    prev = (c == rem);
    return false;
});
in.erase(iter, in.end());

EDIT realized that std::remove_if returns an iterator which can be used.. removed unnecessary code.