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获取一个迭代器，指向缓冲区序列末尾元素的下一个位置。

template<
    typename ConvertibleToBuffer>
const ConvertibleToBuffer * buffer_sequence_end(
    const ConvertibleToBuffer & b,
    constraint_t< !is_convertible< const ConvertibleToBuffer *, const mutable_buffer * >::value >  = 0,
    constraint_t< !is_convertible< const ConvertibleToBuffer *, const const_buffer * >::value >  = 0,
    constraint_t< is_convertible< ConvertibleToBuffer, mutable_buffer >::value||is_convertible< ConvertibleToBuffer, const_buffer >::value >  = 0);