Exchange the states of the specified a and b. If the allocators match, both a and b will be left in a moved-into state, otherwise, both will not. If a and b are the same object, this function will have no effect. No allocations shall occur (so no exceptions will be thrown) unless a and b have different allocators.
Declared in <bsltf_wellbehavedmoveonlyalloctesttype.h>
void
swap(
WellBehavedMoveOnlyAllocTestType& a,
WellBehavedMoveOnlyAllocTestType& b);