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Create a new non-modifiable buffer that represents the given string.
template<
typename Elem,
typename Traits,
typename Allocator>
const_buffer buffer(
const std::basic_string< Elem, Traits, Allocator > & data);
const_buffer(data.data(), data.size() * sizeof(Elem)).
The buffer is invalidated by any non-const operation called on the given string object.