tmp/tmp54rxrz0j/{from.md → to.md}
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| 1 |
+
#### Modifiers <a id="any.modifiers">[[any.modifiers]]</a>
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``` cpp
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template <class T, class... Args>
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decay_t<T>& emplace(Args&&... args);
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```
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Let `VT` be `decay_t<T>`.
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| 9 |
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*Requires:* `VT` shall satisfy the `CopyConstructible` requirements.
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| 11 |
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| 12 |
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*Effects:* Calls `reset()`. Then initializes the contained value as if
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| 13 |
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direct-non-list-initializing an object of type `VT` with the arguments
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`std::forward<Args>(args)...`.
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*Postconditions:* `*this` contains a value.
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*Returns:* A reference to the new contained value.
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*Throws:* Any exception thrown by the selected constructor of `VT`.
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*Remarks:* If an exception is thrown during the call to `VT`’s
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constructor, `*this` does not contain a value, and any previously
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contained value has been destroyed. This function shall not participate
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in overload resolution unless `is_copy_constructible_v<VT>` is `true`
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and `is_constructible_v<VT, Args...>` is `true`.
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``` cpp
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template <class T, class U, class... Args>
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decay_t<T>& emplace(initializer_list<U> il, Args&&... args);
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```
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Let `VT` be `decay_t<T>`.
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| 34 |
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| 35 |
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*Requires:* `VT` shall satisfy the `CopyConstructible` requirements.
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| 36 |
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| 37 |
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*Effects:* Calls `reset()`. Then initializes the contained value as if
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| 38 |
+
direct-non-list-initializing an object of type `VT` with the arguments
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| 39 |
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`il, std::forward<Args>(args)...`.
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| 40 |
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| 41 |
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*Postconditions:* `*this` contains a value.
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| 42 |
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| 43 |
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*Returns:* A reference to the new contained value.
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| 44 |
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| 45 |
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*Throws:* Any exception thrown by the selected constructor of `VT`.
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| 46 |
+
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| 47 |
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*Remarks:* If an exception is thrown during the call to `VT`’s
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| 48 |
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constructor, `*this` does not contain a value, and any previously
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| 49 |
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contained value has been destroyed. The function shall not participate
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| 50 |
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in overload resolution unless `is_copy_constructible_v<VT>` is `true`
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| 51 |
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and `is_constructible_v<VT, initializer_list<U>&, Args...>` is `true`.
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| 52 |
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| 53 |
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``` cpp
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| 54 |
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void reset() noexcept;
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| 55 |
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```
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*Effects:* If `has_value()` is `true`, destroys the contained value.
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*Postconditions:* `has_value()` is `false`.
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``` cpp
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void swap(any& rhs) noexcept;
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```
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*Effects:* Exchanges the states of `*this` and `rhs`.
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| 66 |
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