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Create a new modifiable buffer that represents the given string.
template<
typename Elem,
typename Traits,
typename Allocator>
mutable_buffer buffer(
std::basic_string< Elem, Traits, Allocator > & data);
mutable_buffer(data.size() ? &data[0] : 0, data.size() * sizeof(Elem)).
The buffer is invalidated by any non-const operation called on the given string object.