QJsonArray Class

Member Function Documentation

QJsonArray::QJsonArray()

Creates an empty array.

QJsonArray::QJsonArray(std::initializer_list<QJsonValue> args)

Creates an array initialized from args initialization list.

QJsonArray can be constructed in a way similar to JSON notation, for example:

  QJsonArray array = { 1, 2.2, QString() };

This function was introduced in Qt 5.4.

QJsonArray::QJsonArray(const QJsonArray &other)

Creates a copy of other.

Since QJsonArray is implicitly shared, the copy is shallow as long as the object doesn't get modified.

QJsonArray::~QJsonArray()

Deletes the array.

void QJsonArray::append(const QJsonValue &value)

Inserts value at the end of the array.

See also prepend() and insert().

QJsonValue QJsonArray::at(int i) const

Returns a QJsonValue representing the value for index i.

The returned QJsonValue is Undefined, if i is out of bounds.

iterator QJsonArray::begin()

Returns an STL-style iterator pointing to the first item in the array.

See also constBegin() and end().

const_iterator QJsonArray::begin() const

This is an overloaded function.

const_iterator QJsonArray::constBegin() const

Returns a const STL-style iterator pointing to the first item in the array.

See also begin() and constEnd().

const_iterator QJsonArray::constEnd() const

Returns a const STL-style iterator pointing to the imaginary item after the last item in the array.

See also constBegin() and end().

bool QJsonArray::contains(const QJsonValue &value) const

Returns true if the array contains an occurrence of value, otherwise false.

See also count().

int QJsonArray::count() const

Same as size().

See also size().

bool QJsonArray::empty() const

This function is provided for STL compatibility. It is equivalent to isEmpty() and returns true if the array is empty.

iterator QJsonArray::end()

Returns an STL-style iterator pointing to the imaginary item after the last item in the array.

See also begin() and constEnd().

const_iterator QJsonArray::end() const

This is an overloaded function.

iterator QJsonArray::erase(iterator it)

Removes the item pointed to by it, and returns an iterator pointing to the next item.

See also removeAt().

QJsonValue QJsonArray::first() const

Returns the first value stored in the array.

Same as at(0).

See also at().

[static] QJsonArray QJsonArray::fromStringList(const QStringList &list)

Converts the string list list to a QJsonArray.

The values in list will be converted to JSON values.

See also toVariantList() and QJsonValue::fromVariant().

[static] QJsonArray QJsonArray::fromVariantList(const QVariantList &list)

Converts the variant list list to a QJsonArray.

The QVariant values in list will be converted to JSON values.

See also toVariantList() and QJsonValue::fromVariant().

void QJsonArray::insert(int i, const QJsonValue &value)

Inserts value at index position i in the array. If i is 0, the value is prepended to the array. If i is size(), the value is appended to the array.

See also append(), prepend(), replace(), and removeAt().

iterator QJsonArray::insert(iterator before, const QJsonValue &value)

Inserts value before the position pointed to by before, and returns an iterator pointing to the newly inserted item.

See also erase() and insert().

bool QJsonArray::isEmpty() const

Returns true if the object is empty. This is the same as size() == 0.

See also size().

QJsonValue QJsonArray::last() const

Returns the last value stored in the array.

Same as at(size() - 1).

See also at().

void QJsonArray::pop_back()

This function is provided for STL compatibility. It is equivalent to removeLast(). The array must not be empty. If the array can be empty, call isEmpty() before calling this function.

void QJsonArray::pop_front()

This function is provided for STL compatibility. It is equivalent to removeFirst(). The array must not be empty. If the array can be empty, call isEmpty() before calling this function.

void QJsonArray::prepend(const QJsonValue &value)

Inserts value at the beginning of the array.

This is the same as insert(0, value) and will prepend value to the array.

See also append() and insert().

void QJsonArray::push_back(const QJsonValue &value)

This function is provided for STL compatibility. It is equivalent to append(value) and will append value to the array.

void QJsonArray::push_front(const QJsonValue &value)

This function is provided for STL compatibility. It is equivalent to prepend(value) and will prepend value to the array.

void QJsonArray::removeAt(int i)

Removes the value at index position i. i must be a valid index position in the array (i.e., 0 <= i < size()).

See also insert() and replace().

void QJsonArray::removeFirst()

Removes the first item in the array. Calling this function is equivalent to calling removeAt(0). The array must not be empty. If the array can be empty, call isEmpty() before calling this function.

See also removeAt() and removeLast().

void QJsonArray::removeLast()

Removes the last item in the array. Calling this function is equivalent to calling removeAt(size() - 1). The array must not be empty. If the array can be empty, call isEmpty() before calling this function.

See also removeAt() and removeFirst().

void QJsonArray::replace(int i, const QJsonValue &value)

Replaces the item at index position i with value. i must be a valid index position in the array (i.e., 0 <= i < size()).

See also operator[]() and removeAt().

int QJsonArray::size() const

Returns the number of values stored in the array.

QJsonValue QJsonArray::takeAt(int i)

Removes the item at index position i and returns it. i must be a valid index position in the array (i.e., 0 <= i < size()).

If you don't use the return value, removeAt() is more efficient.

See also removeAt().

QVariantList QJsonArray::toVariantList() const

Converts this object to a QVariantList.

Returns the created map.

bool QJsonArray::operator!=(const QJsonArray &other) const

Returns true if this array is not equal to other.

QJsonArray QJsonArray::operator+(const QJsonValue &value) const

Returns an array that contains all the items in this array followed by the provided value.

This function was introduced in Qt 5.3.

See also operator+=().

QJsonArray &QJsonArray::operator+=(const QJsonValue &value)

Appends value to the array, and returns a reference to the array itself.

This function was introduced in Qt 5.3.

See also append() and operator<<().

QJsonArray &QJsonArray::operator<<(const QJsonValue &value)

Appends value to the array, and returns a reference to the array itself.

This function was introduced in Qt 5.3.

See also operator+=() and append().

QJsonArray &QJsonArray::operator=(const QJsonArray &other)

Assigns other to this array.

bool QJsonArray::operator==(const QJsonArray &other) const

Returns true if this array is equal to other.

QJsonValueRef QJsonArray::operator[](int i)

Returns the value at index position i as a modifiable reference. i must be a valid index position in the array (i.e., 0 <= i < size()).

The return value is of type QJsonValueRef, a helper class for QJsonArray and QJsonObject. When you get an object of type QJsonValueRef, you can use it as if it were a reference to a QJsonValue. If you assign to it, the assignment will apply to the character in the QJsonArray of QJsonObject from which you got the reference.

See also at().

QJsonValue QJsonArray::operator[](int i) const

This is an overloaded function.

Same as at().