Function replace

src/fl/stl/algorithm.h:245–252

template <typename Iterator, typename T>
void replace(Iterator first, Iterator last, const T& old_value, const T& new_value) FL_NOEXCEPT {
    while (first != last) {
        if (*first == old_value) {
            *first = new_value;
        }
        ++first;
    }
}

template <typename Iterator, typename UnaryPredicate, typename T>
void replace_if(Iterator first, Iterator last, UnaryPredicate pred, const T& new_value) FL_NOEXCEPT {