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Submits a completion token or function object for execution.
template< typename Executor, typename CompletionToken> DEDUCED post( const Executor & ex, CompletionToken && token, typename enable_if< is_executor< Executor >::value >::type * = 0);
This function submits an object for execution using the specified executor.
The function object is queued for execution, and is never called from the
current thread prior to returning from post().
This function has the following effects:
Handler,
initialized with handler(forward<CompletionToken>(token)).
result
of type async_result<Handler>, initializing the object as result(handler).
ex1
by performing get_associated_executor(handler).
w
by performing make_work(ex1).
alloc
by performing get_associated_allocator(handler).
f
with a function call operator that performs ex1.dispatch(std::move(handler), alloc) followed by w.reset().
Executor(ex).post(std::move(f), alloc).
result.get().