QPartialOrdering 表示允许无序结果的比较结果。 更多...
头: | #include <QPartialOrdering> |
CMake: |
find_package(Qt6 COMPONENTS Core REQUIRED)
target_link_libraries(mytarget PRIVATE Qt6::Core) |
qmake: | QT += core |
Since: | Qt 6.0 |
const QPartialOrdering | Equivalent |
const QPartialOrdering | Greater |
const QPartialOrdering | Less |
const QPartialOrdering | Unordered |
bool | operator!= (QPartialOrdering p1 , QPartialOrdering p2 ) |
bool | operator== (QPartialOrdering p1 , QPartialOrdering p2 ) |
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.
Represents the result of a comparison where the value on the left hand side is equivalent to the value on right hand side.
Represents the result of a comparison where the value on the left hand side is greater than the value on right hand side.
Represents the result of a comparison where the value on the left hand side is less than the value on right hand side.
Represents the result of a comparison where the value on the left hand side is not ordered with respect to the value on right hand side.
返回 True 若 p1 and p2 represent different results; otherwise, returns true.
返回 True 若 p1 and p2 represent the same result; otherwise, returns false.