Function swap

benchmarks/dlib/stl_checked/std_vector_c.h:275–275

// if the compiler is crappy and would otherwise mess it up.
    template <typename T, typename Allocator>
    void swap(std_vector_c<T,Allocator>& x, std_vector_c<T,Allocator>& y) { x.swap(y); }

    template <typename T, typename Allocator>
    void swap(std::vector<T,Allocator>& x, std_vector_c<T,Allocator>& y) { x.swap(y); }