#### const_buffer::const_buffer

Construct an empty buffer.

    const_buffer();
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Construct a buffer to represent a given memory range.

    const_buffer(
        const void * data,
        std::size_t size);
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Construct a non-modifiable buffer from a modifiable one.

    const_buffer(
        const mutable_buffer & b);
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Construct a buffer from a span of bytes.

    template<
        template< typename, std::size_t > class Span,
        typename T,
        std::size_t Extent>
    const_buffer(
        const Span< T, Extent > & span,
        constraint_t< sizeof(T)==1, defaulted_constraint >  = defaulted_constraint(),
        constraint_t< is_same< decltype(span.subspan(0, 0)), Span< T, static_cast< std::size_t >(-1)> >::value, defaulted_constraint >  = defaulted_constraint());
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