An Example that Omits Destructor Calls For Types with Trivial Destructors

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### An Example that Omits Destructor Calls For Types with Trivial Destructors

Demonstrates a simple algorithm that uses `__has_trivial_destruct` to determine whether to destructors need to be called (see trivial_destructor_example.cpp):

    //
    // algorithm destroy_array:
    // The reverse of std::unitialized_copy, takes a block of
    // initialized memory and calls destructors on all objects therein.
    //

    namespace detail{

    template <class T>
    void do_destroy_array(T* first, T* last, const boost::false_type&)
    {
       while(first != last)
       {
          first->~T();
          ++first;
       }
    }

    template <class T>
    inline void do_destroy_array(T* first, T* last, const boost::true_type&)
    {
    }

    } // namespace detail

    template <class T>
    inline void destroy_array(T* p1, T* p2)
    {
       detail::do_destroy_array(p1, p2, ::boost::has_trivial_destructor<T>());
    }