Return a buffer.

mutable_buffer
buffer(
    mutable_buffer const& b);
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mutable_buffer
buffer(
    void* data,
    std::size_t size);
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const_buffer
buffer(
    const_buffer const& b);
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const_buffer
buffer(
    void const* data,
    std::size_t size);
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template<
    class T,
    std::size_t N>
mutable_buffer
buffer(
    T(&) data [N]);
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template<
    class T,
    std::size_t N>
const_buffer
buffer(
    T const (&) data [N]);
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