17 Language support library [support]

17.12 Coroutines [support.coroutine]

17.12.5 No-op coroutines [coroutine.noop]

17.12.5.1 Class noop_coroutine_promise [coroutine.promise.noop]

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struct noop_coroutine_promise {};
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The class noop_coroutine_promise defines the promise type for the coroutine referred to by noop_coroutine_handle ([coroutine.syn]).

17.12.5.2 Class coroutine_handle<noop_coroutine_promise> [coroutine.handle.noop]

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namespace std { template<> struct coroutine_handle<noop_coroutine_promise> { // [coroutine.handle.noop.conv], conversion constexpr operator coroutine_handle<>() const noexcept; // [coroutine.handle.noop.observers], observers constexpr explicit operator bool() const noexcept; constexpr bool done() const noexcept; // [coroutine.handle.noop.resumption], resumption constexpr void operator()() const noexcept; constexpr void resume() const noexcept; constexpr void destroy() const noexcept; // [coroutine.handle.noop.promise], promise access noop_coroutine_promise& promise() const noexcept; // [coroutine.handle.noop.address], address constexpr void* address() const noexcept; private: coroutine_handle(unspecified); void* ptr; // exposition only }; }

17.12.5.2.1 Conversion [coroutine.handle.noop.conv]

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constexpr operator coroutine_handle<>() const noexcept;
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Effects: Equivalent to: return coroutine_handle<>​::​from_address(address());

17.12.5.2.2 Observers [coroutine.handle.noop.observers]

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constexpr explicit operator bool() const noexcept;
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Returns: true.
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constexpr bool done() const noexcept;
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Returns: false.

17.12.5.2.3 Resumption [coroutine.handle.noop.resumption]

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constexpr void operator()() const noexcept; constexpr void resume() const noexcept; constexpr void destroy() const noexcept;
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Effects: None.
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Remarks: If noop_coroutine_handle is converted to coroutine_handle<>, calls to operator(), resume and destroy on that handle will also have no observable effects.

17.12.5.2.4 Promise access [coroutine.handle.noop.promise]

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noop_coroutine_promise& promise() const noexcept;
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Returns: A reference to the promise object associated with this coroutine handle.

17.12.5.2.5 Address [coroutine.handle.noop.address]

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constexpr void* address() const noexcept;
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Returns: ptr.
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Remarks: A noop_coroutine_handle's ptr is always a non-null pointer value.

17.12.5.3 Function noop_coroutine [coroutine.noop.coroutine]

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noop_coroutine_handle noop_coroutine() noexcept;
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Returns: A handle to a coroutine that has no observable effects when resumed or destroyed.
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Remarks: A handle returned from noop_coroutine may or may not compare equal to a handle returned from another invocation of noop_coroutine.