QPartialOrdering Class

QPartialOrdering represents the result of a comparison that allows for unordered results. More...

Header:	#include <QPartialOrdering>
CMake:	find_package(Qt6 COMPONENTS Core REQUIRED) target_link_libraries(mytarget PRIVATE Qt6::Core)
qmake:	QT += core
Since:	Qt 6.0

• List of all members, including inherited members

Static Public Members

const QPartialOrdering	Equivalent
const QPartialOrdering	Greater
const QPartialOrdering	Less
const QPartialOrdering	Unordered

Related Non-Members

bool	operator!=(QPartialOrdering p1, QPartialOrdering p2)
bool	operator==(QPartialOrdering p1, QPartialOrdering p2)

Detailed Description

A value of type QPartialOrdering is typically returned from a three-way comparison function. Such a function compares two objects, and it may either establish that the two objects are ordered relative to each other, or that they are not ordered. The QPartialOrdering value returned from the comparison function represents one of those possibilities.

The possible values of type QPartialOrdering are, in fact, fully represented by the following four static values:

• QPartialOrdering::Less represents that the first object is less than the second;
• QPartialOrdering::Equivalent represents that the first object is equivalent to the second;
• QPartialOrdering::Greater represents that the first object is equivalent to the second;
• QPartialOrdering::Unordered represents that the first object is not ordered with respect to the second.

QPartialOrdering is idiomatically used by comparing an instance against a literal zero, for instance like this:

// given a, b, c, d as objects of some type that allows for a 3-way compare

QPartialOrdering result = a.compare(b);
if (result < 0) {
    // a is less than b
}

if (c.compare(d) >= 0) {
    // c is greater than or equal to d
}

A QPartialOrdering value which represents an unordered result will always return false when compared against literal 0.