Showing content from https://en.cppreference.com/w/cpp/language/../utility/program/../compare/partial_order.html below:
std::partial_order - cppreference.com
inline namespace /* unspecified */ {
inline constexpr /* unspecified */ partial_order = /* unspecified */;
} (since C++20)
Call signature
template< class T, class U >
requires /* see below */
constexpr std::partial_ordering
partial_order( T&& t, U&& u ) noexcept(/* see below */);
Compares two values using 3-way comparison and produces a result of type std::partial_ordering.
Let t and u be expressions and T and U denote decltype((t)) and decltype((u)) respectively, std::partial_order(t, u) is expression-equivalent to:
- If std::is_same_v<std::decay_t<T>, std::decay_t<U>> is true:
- std::partial_ordering(partial_order(t, u)), if it is a well-formed expression with overload resolution performed in a context that does not include a declaration of
std::partial_order,
- otherwise, std::partial_ordering(std::compare_three_way()(t, u)), if it is well-formed,
- otherwise, std::partial_ordering(std::weak_order(t, u)), if it is well-formed.
- In all other cases, the expression is ill-formed, which can result in substitution failure when it appears in the immediate context of a template instantiation.
Customization point objects
The name std::partial_order denotes a customization point object, which is a const function object of a literal semiregular class type. See CustomizationPointObject for details.
[edit] Example [edit] See also the result type of 3-way comparison that supports all 6 operators, is not substitutable, and allows incomparable values
(class) [edit] performs 3-way comparison and produces a result of type std::strong_ordering
(customization point object)[edit] performs 3-way comparison and produces a result of type std::weak_ordering
(customization point object)[edit] performs 3-way comparison and produces a result of type std::partial_ordering, even if operator<=> is unavailable
(customization point object)[edit]
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