tmp/tmpdlsqiyi5/{from.md → to.md}
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#### Construct/reset <a id="coroutine.handle.con">[[coroutine.handle.con]]</a>
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``` cpp
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constexpr coroutine_handle() noexcept;
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constexpr coroutine_handle(nullptr_t) noexcept;
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```
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*Ensures:* `address() == nullptr`.
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``` cpp
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static coroutine_handle from_promise(Promise& p);
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```
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*Preconditions:* `p` is a reference to a promise object of a coroutine.
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*Returns:* A coroutine handle `h` referring to the coroutine.
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*Ensures:* `addressof(h.promise()) == addressof(p)`.
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``` cpp
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coroutine_handle& operator=(nullptr_t) noexcept;
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```
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*Ensures:* `address() == nullptr`.
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*Returns:* `*this`.
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