C++ convert int to string

tiny_string.cpp

std::string from_int(int value) {
    int tmp = value;
    std::string valueAsString = tmp < 0 ? "-" : "";
    size_t pos = valueAsString.length();

    if(tmp < 0) tmp = -tmp;
    else if(tmp == 0) valueAsString = "0";
    while(tmp != 0) {
        int digit = tmp%10;
        valueAsString.insert(pos,1,'0' + digit);
        tmp/=10;
    }

    return valueAsString;
}