#### any_completion_handler::any_completion_handler

Construct an `any_completion_handler` in an empty state, without a target object.

    constexpr any_completion_handler();
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    constexpr any_completion_handler(
        nullptr_t );
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Construct an `any_completion_handler` to contain the specified target.

    template<
        typename H,
        typename Handler = decay_t<H>>
    any_completion_handler(
        H && h,
        constraint_t< !is_same< decay_t< H >, any_completion_handler >::value >  = 0);
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Move-construct an `any_completion_handler` from another.

    any_completion_handler(
        any_completion_handler && other);
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