'Can anyone explain this code? I do not understand the working of not1() and ptr_fun()

Can anyone explain the working of this function?

string rightTrim(const string &str)
{
    string s(str);
    s.erase(find_if(s.rbegin(), s.rend(), not1(ptr_fun<int, int>(isspace))).base(), s.end());
    return s;
}

I don't know the working of not1() and ptr_fun(). Can anyone provide me with a good explanation for this code?

PS: I know, this code removes any white spaces from the end of the string.

c++c++11c++14


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