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