QJniArrayBase Class
The QJniArrayBase class provides common, type-independent APIs for QJniArray. More...
Header: | #include <QJniArrayBase> |
CMake: | find_package(Qt6 REQUIRED COMPONENTS Core) target_link_libraries(mytarget PRIVATE Qt6::Core) |
qmake: | QT += core |
Since: | Qt 6.8 |
Inherited By: |
Public Types
Public Functions
bool | isEmpty() const |
bool | isValid() const |
T | object() const |
QJniArrayBase::size_type | size() const |
QJniObject | operator QJniObject() const |
Static Public Members
auto | fromContainer(Container &&container) |
Protected Functions
void | swap(QJniArrayBase &other) |
Member Function Documentation
[static]
template <typename Container, QJniArrayBase::if_compatible_source_container<Container> = true> auto QJniArrayBase::fromContainer(Container &&container)
Creates a Java array holding the data in container, and returns a QJniArray instance that wraps it.
This function only participates in overload resolution if Container
is a container that stores elements of a JNI type or equivalent C++ type, and provides a forward iterator.
The specialization of the constructed QJniArray depends on the value type of the container. For a Container<T>
(such as e.g. QList<T>
) it will typically be QJniArray<T>
, with the following exceptions:
Container | Specialization |
---|---|
QByteArray | QJniArray<jbyte> |
QStringList | QJniArray<jstring> |
Container::value_type | Specialization |
QJniObject | QJniArray<jobject> |
See also QJniArray::toContainer().
bool QJniArrayBase::isEmpty() const
Returns true
if the array has size 0; otherwise returns false
.
An invalid array is always empty.
isValid()
, size()
bool QJniArrayBase::isValid() const
Returns whether the QJniArray object wraps a valid `jobject`. For invalid QJniArray instances, object() returns nullptr
. Iterating over an invalid object is safe (begin() will return the same as end()), and calling toContainer() on an invalid array will return an empty container.
See also QJniObject::isValid(), object(), and QJniArray::toContainer().
template <typename T = jobject> T QJniArrayBase::object() const
Returns the object held by the QJniArray as type T, which can be one of the JNI Object Types.
QJniArrayBase::size_type QJniArrayBase::size() const
Returns the size of the array.
[noexcept protected]
void QJniArrayBase::swap(QJniArrayBase &other)
Swaps this array object with other. This function is very fast and never fails.
QJniObject QJniArrayBase::operator QJniObject() const
Returns a QJniObject wrapping the same jobject
as this QJniArray instance.
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