Qt::strong_ordering Class | Qt Core (original) (raw)
class Qt::strong_ordering
Qt::strong_ordering represents a comparison where equivalent values are indistinguishable. More...
| Header: | #include |
|---|---|
| CMake: | find_package(Qt6 REQUIRED COMPONENTS Core) target_link_libraries(mytarget PRIVATE Qt6::Core) |
| qmake: | QT += core |
| Since: | Qt 6.7 |
Public Functions
Static Public Members
| const Qt::strong_ordering | equal |
|---|---|
| const Qt::strong_ordering | equivalent |
| const Qt::strong_ordering | greater |
| const Qt::strong_ordering | less |
| bool | is_eq(Qt::strong_ordering o) |
|---|---|
| bool | is_gt(Qt::strong_ordering o) |
| bool | is_gteq(Qt::strong_ordering o) |
| bool | is_lt(Qt::strong_ordering o) |
| bool | is_lteq(Qt::strong_ordering o) |
| bool | is_neq(Qt::strong_ordering o) |
| bool | operator!=(Qt::strong_ordering lhs, Qt::strong_ordering rhs) |
| bool | operator==(Qt::strong_ordering lhs, Qt::strong_ordering rhs) |
Detailed Description
A value of type Qt::strong_ordering is typically returned from a three-way comparison function. Such a function compares two objects and establishes how they are ordered. It uses this return type to indicate that the ordering is strict; that is, the function establishes a well-defined total order.
Qt::strong_ordering has four values, represented by the following symbolic constants:
- less represents that the left operand is less than the right;
- equal represents that the left operand is equivalent to the right;
- equivalent is an alias for
equal; - greater represents that the left operand is greater than the right.
Qt::strong_ordering 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, // and a compare function declared as follows:
Qt::strong_ordering compare(T lhs, T rhs); // defined out-of-line
~~~
Qt::strong_ordering result = compare(a, b); if (result < 0) { // a is less than b }
if (compare(c, d) >= 0) { // c is greater than or equal to d }
See also Qt::weak_ordering, Qt::partial_ordering, and Comparison types overview.
Member Variable Documentation
const Qt::strong_ordering strong_ordering::equal
Represents the result of a comparison where the left operand is equal to the right operand. Same as Qt::strong_ordering::equivalent.
const Qt::strong_ordering strong_ordering::equivalent
Represents the result of a comparison where the left operand is equal to the right operand. Same as Qt::strong_ordering::equal.
const Qt::strong_ordering strong_ordering::greater
Represents the result of a comparison where the left operand is greater than the right operand.
const Qt::strong_ordering strong_ordering::less
Represents the result of a comparison where the left operand is less than the right operand.
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