From Jason Turner

[optional.nullops]

C++17 → C++20 1.8 KB 57 lines
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Archived: C++17 | C++20
Markdown: C++17 | C++20
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  1. tmp/tmpspevncth/{from.md → to.md} +2 -52
tmp/tmpspevncth/{from.md → to.md} RENAMED
@@ -1,64 +1,14 @@
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  ### Comparison with `nullopt` <a id="optional.nullops">[[optional.nullops]]</a>
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  ``` cpp
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  template<class T> constexpr bool operator==(const optional<T>& x, nullopt_t) noexcept;
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- template <class T> constexpr bool operator==(nullopt_t, const optional<T>& x) noexcept;
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  ```
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  *Returns:* `!x`.
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  ``` cpp
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- template <class T> constexpr bool operator!=(const optional<T>& x, nullopt_t) noexcept;
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- template <class T> constexpr bool operator!=(nullopt_t, const optional<T>& x) noexcept;
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  ```
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- *Returns:* `bool(x)`.
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-
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- ``` cpp
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- template <class T> constexpr bool operator<(const optional<T>& x, nullopt_t) noexcept;
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- ```
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-
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- *Returns:* `false`.
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-
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- ``` cpp
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- template <class T> constexpr bool operator<(nullopt_t, const optional<T>& x) noexcept;
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- ```
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-
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- *Returns:* `bool(x)`.
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-
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- ``` cpp
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- template <class T> constexpr bool operator<=(const optional<T>& x, nullopt_t) noexcept;
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- ```
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-
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- *Returns:* `!x`.
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-
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- ``` cpp
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- template <class T> constexpr bool operator<=(nullopt_t, const optional<T>& x) noexcept;
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- ```
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-
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- *Returns:* `true`.
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-
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- ``` cpp
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- template <class T> constexpr bool operator>(const optional<T>& x, nullopt_t) noexcept;
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- ```
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-
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- *Returns:* `bool(x)`.
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-
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- ``` cpp
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- template <class T> constexpr bool operator>(nullopt_t, const optional<T>& x) noexcept;
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- ```
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-
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- *Returns:* `false`.
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-
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- ``` cpp
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- template <class T> constexpr bool operator>=(const optional<T>& x, nullopt_t) noexcept;
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- ```
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-
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- *Returns:* `true`.
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-
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- ``` cpp
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- template <class T> constexpr bool operator>=(nullopt_t, const optional<T>& x) noexcept;
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- ```
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-
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- *Returns:* `!x`.
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  ### Comparison with `nullopt` <a id="optional.nullops">[[optional.nullops]]</a>
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  ``` cpp
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  template<class T> constexpr bool operator==(const optional<T>& x, nullopt_t) noexcept;
 
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  ```
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  *Returns:* `!x`.
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  ``` cpp
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+ template<class T> constexpr strong_ordering operator<=>(const optional<T>& x, nullopt_t) noexcept;
 
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  ```
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+ *Returns:* `bool(x) <=> false`.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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