From Jason Turner

[optional.swap]

C++20 → C++23 3.6 KB 9 lines
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Archived: C++20 | C++23
Markdown: C++20 | C++23
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tmp/tmp8u4hpyyt/{from.md → to.md} RENAMED
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  **Table: `optional::swap(optional&)` effects** <a id="optional.swap">[optional.swap]</a>
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  | | `*this` contains a value | `*this` does not contain a value |
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- | ------------------------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
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- | `rhs` contains a value | calls `swap(*(*this), *rhs)` | initializes the contained value of `*this` as if direct-non-list-initializing an object of type `T` with the expression `std::move(*rhs)`, followed by `rhs.val->T::~T()`; postcondition is that `*this` contains a value and `rhs` does not contain a value |
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- | `rhs` does not contain a value | initializes the contained value of `rhs` as if direct-non-list-initializing an object of type `T` with the expression `std::move(*(*this))`, followed by `val->T::~T()`; postcondition is that `*this` does not contain a value and `rhs` contains a value | no effect |
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  **Table: `optional::swap(optional&)` effects** <a id="optional.swap">[optional.swap]</a>
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  | | `*this` contains a value | `*this` does not contain a value |
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+ | ------------------------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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+ | `rhs` contains a value | calls `swap(*(*this), *rhs)` | direct-non-list-initializes the contained value of `*this` with `std::move(*rhs)`, followed by `rhs.val->T::~T()`; postcondition is that `*this` contains a value and `rhs` does not contain a value |
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+ | `rhs` does not contain a value | direct-non-list-initializes the contained value of `rhs` with `std::move(*(*this))`, followed by `val->T::~T()`; postcondition is that `*this` does not contain a value and `rhs` contains a value | no effect |
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