Add the specified functor at the front of this queue. Return 0 on success, and a non-zero value if enqueuing is disabled. The value of functor becomes unspecified but valid, and its allocator remains unchanged.
functor
Declared in <bdlmt_multiqueuethreadpool.h>
<bdlmt_multiqueuethreadpool.h>
int pushFront(bslmf::MovableRef<Job> functor);