Write the value of the specified map to the specified output stream in a single-line format, and return a reference providing modifiable access to stream. If stream is not valid on entry, this operation has no effect. Note that this human-readable format is not fully specified and can change without notice.
Declared in <bdlc_flathashmap.h>
template<
class KEY,
class VALUE,
class HASH,
class EQUAL>
std::ostream&
operator<<(
std::ostream& stream,
FlatHashMap<KEY, VALUE, HASH, EQUAL> const& map);