From Jason Turner

[syserr.compare]

C++17 → C++20 2.5 KB 61 lines
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Archived: C++17 | C++20
Markdown: C++17 | C++20
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  ### Comparison functions <a id="syserr.compare">[[syserr.compare]]</a>
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- ``` cpp
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- bool operator<(const error_code& lhs, const error_code& rhs) noexcept;
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- ```
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-
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- *Returns:*
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-
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- ``` cpp
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- lhs.category() < rhs.category() ||
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- (lhs.category() == rhs.category() && lhs.value() < rhs.value());
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- ```
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-
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- ``` cpp
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- bool operator<(const error_condition& lhs, const error_condition& rhs) noexcept;
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- ```
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-
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- *Returns:*
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- `lhs.category() < rhs.category() || lhs.category() == rhs.category() &&`
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- `lhs.value() < rhs.value()`.
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-
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  ``` cpp
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  bool operator==(const error_code& lhs, const error_code& rhs) noexcept;
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  ```
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  *Returns:*
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- `lhs.category() == rhs.category() && lhs.value() == rhs.value()`.
 
 
 
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  ``` cpp
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  bool operator==(const error_code& lhs, const error_condition& rhs) noexcept;
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  ```
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  *Returns:*
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- `lhs.category().equivalent(lhs.value(), rhs) || rhs.category().equivalent(lhs, rhs.value())`.
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  ``` cpp
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- bool operator==(const error_condition& lhs, const error_code& rhs) noexcept;
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  ```
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- *Returns:*
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- `rhs.category().equivalent(rhs.value(), lhs) || lhs.category().equivalent(rhs, lhs.value())`.
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-
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  ``` cpp
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  bool operator==(const error_condition& lhs, const error_condition& rhs) noexcept;
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  ```
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  *Returns:*
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- `lhs.category() == rhs.category() && lhs.value() == rhs.value()`.
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  ``` cpp
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- bool operator!=(const error_code& lhs, const error_code& rhs) noexcept;
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- bool operator!=(const error_code& lhs, const error_condition& rhs) noexcept;
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- bool operator!=(const error_condition& lhs, const error_code& rhs) noexcept;
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- bool operator!=(const error_condition& lhs, const error_condition& rhs) noexcept;
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  ```
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- *Returns:* `!(lhs == rhs)`.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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  ### Comparison functions <a id="syserr.compare">[[syserr.compare]]</a>
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  ``` cpp
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  bool operator==(const error_code& lhs, const error_code& rhs) noexcept;
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  ```
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  *Returns:*
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+
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+ ``` cpp
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+ lhs.category() == rhs.category() && lhs.value() == rhs.value()
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+ ```
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  ``` cpp
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  bool operator==(const error_code& lhs, const error_condition& rhs) noexcept;
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  ```
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  *Returns:*
 
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  ``` cpp
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+ lhs.category().equivalent(lhs.value(), rhs) || rhs.category().equivalent(lhs, rhs.value())
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  ```
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  ``` cpp
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  bool operator==(const error_condition& lhs, const error_condition& rhs) noexcept;
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  ```
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  *Returns:*
 
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  ``` cpp
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+ lhs.category() == rhs.category() && lhs.value() == rhs.value()
 
 
 
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  ```
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+ ``` cpp
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+ strong_ordering operator<=>(const error_code& lhs, const error_code& rhs) noexcept;
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+ ```
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+
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+ *Effects:* Equivalent to:
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+
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+ ``` cpp
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+ if (auto c = lhs.category() <=> rhs.category(); c != 0) return c;
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+ return lhs.value() <=> rhs.value();
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+ ```
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+
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+ ``` cpp
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+ strong_ordering operator<=>(const error_condition& lhs, const error_condition& rhs) noexcept;
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+ ```
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+
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+ *Returns:*
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+
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+ ``` cpp
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+ if (auto c = lhs.category() <=> rhs.category(); c != 0) return c;
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+ return lhs.value() <=> rhs.value();
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+ ```
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