Exchange the value, the hasher, and the key-equality functor of the specified a and b objects. This function provides the no-throw exception-safety guarantee if the two objects were created with the same allocator and the basic guarantee otherwise.
Declared in <bdlc_flathashmap.h>
template<
class KEY,
class VALUE,
class HASH,
class EQUAL>
void
swap(
FlatHashMap<KEY, VALUE, HASH, EQUAL>& a,
FlatHashMap<KEY, VALUE, HASH, EQUAL>& b);