tmp/tmpduv4bjfc/{from.md → to.md}
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| 1 |
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### Class template `bad_expected_access` <a id="expected.bad">[[expected.bad]]</a>
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``` cpp
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namespace std {
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template<class E>
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class bad_expected_access : public bad_expected_access<void> {
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public:
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explicit bad_expected_access(E);
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const char* what() const noexcept override;
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E& error() & noexcept;
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const E& error() const & noexcept;
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E&& error() && noexcept;
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const E&& error() const && noexcept;
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private:
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E unex; // exposition only
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};
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}
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```
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The class template `bad_expected_access` defines the type of objects
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thrown as exceptions to report the situation where an attempt is made to
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access the value of an `expected<T, E>` object for which `has_value()`
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is `false`.
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``` cpp
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explicit bad_expected_access(E e);
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```
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*Effects:* Initializes *unex* with `std::move(e)`.
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``` cpp
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const E& error() const & noexcept;
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E& error() & noexcept;
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```
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*Returns:* *unex*.
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``` cpp
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E&& error() && noexcept;
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const E&& error() const && noexcept;
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```
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*Returns:* `std::move(`*`unex`*`)`.
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``` cpp
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const char* what() const noexcept override;
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```
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*Returns:* An implementation-defined NTBS.
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