std::partial_ordering

Header: <compare>

The class type std::partial_ordering is the result type of a three-way comparison that:

# Declarations

class partial_ordering;

(since C++20)

# Parameters

• v, w: std::partial_ordering values to check
• u: an unused parameter of any type that accepts literal zero argument

# Notes

The built-in operator<=> between floating-point values uses this ordering: the positive zero and the negative zero compare equivalent, but can be distinguished, and NaN values compare unordered with any other value.

# Example

This section is incompleteReason: no example

# See also

• strong_ordering
• weak_ordering