Function copy

extern/nfd/nfd_gtk.cpp:62–67

template <typename T>
T* copy(const T* begin, const T* end, T* out) {
    for (; begin != end; ++begin) {
        *out++ = *begin;
    }
    return out;
}

// Does not own the filter and extension.
struct Pair_GtkFileFilter_FileExtension {