Submits a completion token or function object for execution.

template<
    typename CompletionToken>
DEDUCED dispatch(
    CompletionToken && token);
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template<
    typename Executor,
    typename CompletionToken>
DEDUCED dispatch(
    const Executor & ex,
    CompletionToken && token,
    typename enable_if< is_executor< Executor >::value >::type *  = 0);
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template<
    typename ExecutionContext,
    typename CompletionToken>
DEDUCED dispatch(
    ExecutionContext & ctx,
    CompletionToken && token,
    typename enable_if< is_convertible< ExecutionContext &, execution_context & >::value >::type *  = 0);
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