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### Convertible to const buffer requirements

A type that meets the requirements for convertibility to a const buffer must meet the requirements of `CopyConstructible` types (C++ Std, 20.1.3), and the requirements of `Assignable` types (C++ Std, 23.1).

In the table below, `X` denotes a class meeting the requirements for convertibility to a const buffer, `a` and `b` denote values of type `X`, and `u`, `v` and `w` denote identifiers.

Table 4. ConvertibleToConstBuffer requirements

expression | postcondition
--- | ---
    const_buffer u(a);
    const_buffer v(a);
    buffer_cast<const void*>(u) == buffer_cast<const void*>(v)
      && buffer_size(u) == buffer_size(v)
    const_buffer u(a);
    const_buffer v = a;
    buffer_cast<const void*>(u) == buffer_cast<const void*>(v)
      && buffer_size(u) == buffer_size(v)
    const_buffer u(a);
    const_buffer v; v = a;
    buffer_cast<const void*>(u) == buffer_cast<const void*>(v)
      && buffer_size(u) == buffer_size(v)
    const_buffer u(a);
    const X& v = a;
    const_buffer w(v);
    buffer_cast<const void*>(u) == buffer_cast<const void*>(w)
      && buffer_size(u) == buffer_size(w)
    const_buffer u(a);
    X v(a);
    const_buffer w(v);
    buffer_cast<const void*>(u) == buffer_cast<const void*>(w)
      && buffer_size(u) == buffer_size(w)
    const_buffer u(a);
    X v = a;
    const_buffer w(v);
    buffer_cast<const void*>(u) == buffer_cast<const void*>(w)
      && buffer_size(u) == buffer_size(w)
    const_buffer u(a);
    X v(b); v = a;
    const_buffer w(v);
    buffer_cast<const void*>(u) == buffer_cast<const void*>(w)
      && buffer_size(u) == buffer_size(w)