simple_promise
A simple_promise<T> is the simplest “returning” promise. The internal state maintains an optional<T> which is set by the coroutine body. This allows a [coroutine Type](#Coroutine-Types) to pull out the return type and provide it to the caller. simple_promise<T> satisfies the Returnable concept.
The coroutine key words available are co_return (ARG) where T is constructible from ARG, co_return (std::nullopt_t) in the case the promise cannot be fulfilled and co_await (AwaitableProxy) for suspension.
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template<typename T = void>
class zab::simple_promise : public zab::simple_common<simple_promise<void>> The promise of some value used be
simple_future’s.- Template Parameters
T – The type of the promised value.
Public Functions
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simple_promise() = default
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~simple_promise() = default
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template<typename ...Args>
inline void return_value(Args&&... _args) noexcept Creates the promised object from some values.
One day they may support
co_return x y z;- Parameters
_args – The arguments to construct T with.
- Template Parameters
Args – The types of the arguments.
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inline void return_value(returns &&_move) noexcept
Construct the optional of T.
- Parameters
_move – The optional to move.
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inline void return_value(std::nullopt_t) noexcept
No value is returned.
