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Swap the contents.
void swap( string& other);
Exchanges the contents of this string with another string. Ownership
of the respective memory_resource
objects is not
transferred.
&other
== this
,
do nothing. Otherwise,
*other.storage() == *this->storage()
, ownership of the underlying memory
is swapped in constant time, with no possibility of exceptions. All
iterators and references remain valid. Otherwise,
Constant or linear in size()
plus other.size()
.
Strong guarantee. Calls to memory_resource::allocate
may throw.