Request the strand to invoke the given function object.

template<
    typename Function,
    typename Allocator>
void dispatch(
    Function && f,
    const Allocator & a) const;
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(Deprecated: Use dispatch.) Request the strand to invoke the given handler.

template<
    typename LegacyCompletionHandler>
DEDUCED dispatch(
    LegacyCompletionHandler && handler);
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