tmp/tmp10_mqqoc/{from.md → to.md}
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| 1 |
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#### Observers <a id="expected.void.obs">[[expected.void.obs]]</a>
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``` cpp
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constexpr explicit operator bool() const noexcept;
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constexpr bool has_value() const noexcept;
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```
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*Returns:* *has_val*.
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``` cpp
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constexpr void operator*() const noexcept;
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```
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*Preconditions:* `has_value()` is `true`.
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``` cpp
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constexpr void value() const &;
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```
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*Throws:* `bad_expected_access(error())` if `has_value()` is `false`.
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``` cpp
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constexpr void value() &&;
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```
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*Throws:* `bad_expected_access(std::move(error()))` if `has_value()` is
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`false`.
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``` cpp
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constexpr const E& error() const & noexcept;
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constexpr E& error() & noexcept;
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```
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*Preconditions:* `has_value()` is `false`.
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*Returns:* *unex*.
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``` cpp
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constexpr E&& error() && noexcept;
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constexpr const E&& error() const && noexcept;
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```
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*Preconditions:* `has_value()` is `false`.
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*Returns:* `std::move(`*`unex`*`)`.
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``` cpp
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template<class G = E> constexpr E error_or(G&& e) const &;
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```
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*Mandates:* `is_copy_constructible_v<E>` is `true` and
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| 52 |
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`is_convertible_v<G, E>` is `true`.
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| 53 |
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*Returns:* `std::forward<G>(e)` if `has_value()` is `true`, `error()`
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otherwise.
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``` cpp
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template<class G = E> constexpr E error_or(G&& e) &&;
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```
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*Mandates:* `is_move_constructible_v<E>` is `true` and
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`is_convertible_v<G, E>` is `true`.
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*Returns:* `std::forward<G>(e)` if `has_value()` is `true`,
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`std::move(error())` otherwise.
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