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Installs a handler into the slot, constructing the new object directly.
template<
typename CancellationHandler,
typename... Args>
CancellationHandler & emplace(
Args &&... args);
Destroys any existing handler in the slot, then installs the new handler,
constructing it with the supplied args.
The handler is a function object to be called when the signal is emitted. The signature of the handler must be
void handler(boost::asio::cancellation_type_t);
Arguments to be passed to the CancellationHandler object's
constructor.
A reference to the newly installed handler.
Handlers installed into the slot via emplace are not required
to be copy constructible or move constructible.