reverse and replace in c++

rr.h

#include <iostream>
#include <string>
#include <algorithm>

unsigned int reverse_and_replace(std::string& str)
{
    // reverse string
    std::reverse(str.begin(), str.end());

    // replace all '\' chars and count number of replaces
    // I am using anonymous functions to do it, so
    // it should be compiled with -std=c++0x parameter
    // Technically, it can be done with external function or
    // function object (functor), but I just like anonymous 
    // functions in a new standard
    unsigned int count = 0;
    std::replace_if(str.begin(), str.end(), [&count](char ch) {
        bool ret = false;
        if (ch == '\\')
        {
            count++;
            ret = true;
        }
        return ret;
        // there is a more beautiful way, but I don't think it's readable
        // return ((ch == '\\') ? ++count, true : false);
    }, '/');

    return count;
}