Create an executor_work_guard object.

template<
    typename Executor>
executor_work_guard< Executor > make_work_guard(
    const Executor & ex,
    typename enable_if< is_executor< Executor >::value >::type *  = 0);
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template<
    typename ExecutionContext>
executor_work_guard< typename ExecutionContext::executor_type > make_work_guard(
    ExecutionContext & ctx,
    typename enable_if< is_convertible< ExecutionContext &, execution_context & >::value >::type *  = 0);
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template<
    typename T>
executor_work_guard< typename associated_executor< T >::type > make_work_guard(
    const T & t,
    typename enable_if<!is_executor< T >::value &&!is_convertible< T &, execution_context & >::value >::type *  = 0);
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template<
    typename T,
    typename Executor>
executor_work_guard< typename associated_executor< T, Executor >::type > make_work_guard(
    const T & t,
    const Executor & ex,
    typename enable_if< is_executor< Executor >::value >::type *  = 0);
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template<
    typename T,
    typename ExecutionContext>
executor_work_guard< typename associated_executor< T, typename ExecutionContext::executor_type >::type > make_work_guard(
    const T & t,
    ExecutionContext & ctx,
    typename enable_if<!is_executor< T >::value &&!is_convertible< T &, execution_context & >::value >::type *  = 0);
  » more...