Create a stream observer that transmits log records to the specified stream. Optionally specify an allocator (e.g., the address of a bslma::Allocator object) to supply memory; otherwise, the default allocator is used. Note that a default record format is in effect for stream logging (see logRecordDefault).
Declared in <ball_streamobserver.h>
explicit
StreamObserver(
std::ostream* stream,
allocator_type const& allocator = allocator_type());