#### buffer_sequence_begin (5 of 7 overloads)

Get an iterator to the first element in a buffer sequence.

    template<
        typename C>
    auto buffer_sequence_begin(
        const C & c,
        constraint_t< !is_convertible< const C *, const mutable_buffer * >::value >  = 0,
        constraint_t< !is_convertible< const C *, const const_buffer * >::value >  = 0,
        constraint_t< !is_convertible< C, mutable_buffer >::value >  = 0,
        constraint_t< !is_convertible< C, const_buffer >::value >  = 0);