- Qt 6.4
- Qt Core
- C++ Classes
- QCollatorSortKey
- Qt 6.4.2 Reference Documentation

# QCollatorSortKey Class

The QCollatorSortKey class can be used to speed up string collation. More...

Header: | #include <QCollatorSortKey>
CMake: | find_package(Qt6 REQUIRED COMPONENTS Core) target_link_libraries(mytarget PRIVATE Qt6::Core)
qmake: | QT += core
Since: | Qt 5.2

- List of all members, including inherited members

Note: All functions in this class are reentrant.

## Public Functions

| QCollatorSortKey(const QCollatorSortKey &other)
QCollatorSortKey & | operator=(QCollatorSortKey &&other)
QCollatorSortKey & | operator=(const QCollatorSortKey &other)
| ~QCollatorSortKey()
int | compare(const QCollatorSortKey &otherKey) const
void | swap(QCollatorSortKey &other)

## Related Non-Members

bool | operator<(const QCollatorSortKey &lhs, const QCollatorSortKey &rhs)

## Detailed Description

The QCollatorSortKey class is always created by QCollator::sortKey() and is used for fast strings collation, for example when collating many strings.

See also QCollator, QCollator::sortKey(), and compare().

## Member Function Documentation

### QCollatorSortKey::QCollatorSortKey(const QCollatorSortKey &other)

Constructs a copy of the other collator key.

### QCollatorSortKey &QCollatorSortKey::operator=(QCollatorSortKey &&other)

Move-assigns other to this collator key.

### QCollatorSortKey &QCollatorSortKey::operator=(const QCollatorSortKey &other)

Assigns other to this collator key.

### QCollatorSortKey::~QCollatorSortKey()

Destroys the collator key.

### int QCollatorSortKey::compare(const QCollatorSortKey &otherKey) const

Compares this key to otherKey, which must have been created by the same QCollator's sortKey() as this key. The comparison is performed in accordance with that QCollator's sort order.

Returns a negative value if this key sorts before otherKey, 0 if the two keys are equal or a positive value if this key sorts after otherKey.

See also operator<().

### void QCollatorSortKey::swap(QCollatorSortKey &other)

Swaps this collator key with other.

## Related Non-Members

### bool operator<(const QCollatorSortKey &lhs, const QCollatorSortKey &rhs)

Both keys must have been created by the same QCollator's sortKey(). Returns `true` if lhs should be sorted before rhs, according to the QCollator that created them; otherwise returns `false`.

See also QCollatorSortKey::compare().