std::error_category::operator==,!=,<,<=>
From cppreference.com
< cpp | error | error category
bool operator==( const error_category& rhs ) const noexcept; |
(1) | (since C++11) |
bool operator!=( const error_category& rhs ) const noexcept; |
(2) | (since C++11) (until C++20) |
bool operator<( const error_category& rhs ) const noexcept; |
(3) | (since C++11) (until C++20) |
std::strong_ordering operator<=>( const error_category& rhs ) const noexcept; |
(4) | (since C++20) |
Compares to another error category.
1) Checks whether *this and rhs refer to the same object.
2) Checks whether *this and rhs do not refer to the same object.
3) Orders *this and rhs by the order of this and &rhs. Equivalent to std::less<const error_category*>()(this, &rhs).
4) Orders *this and rhs by the order of this and &rhs. Equivalent to std::compare_three_way()(this, &rhs).
The |
(since C++20) |
[edit] Parameters
rhs | - | specifies the error_category to compare
|
[edit] Return value
1) true if *this and rhs refer to the same object, false otherwise.
2) true if *this and rhs do not refer to the same object, false otherwise.
3) true if *this is less than rhs as defined by the order of this and &rhs.
4) std::strong_order::less if *this is less than rhs as defined by the order of this and &rhs, otherwise std::strong_order::greater if rhs is less than *this in the order, otherwise std::strong_order::equal.