QStack Class▲
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Header: QStack
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qmake: QT += core
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Inherits: https://
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Group: QStack is part of tools, https://
Detailed Description▲
https://<T> is one of Qt's generic https://. It implements a stack data structure for items of a same type.
A stack is a last in, first out (LIFO) structure. Items are added to the top of the stack using push() and retrieved from the top using pop(). The https://() function provides access to the topmost item without removing it.
Example:
QStack<int> stack;
stack.push(1);
stack.push(2);
stack.push(3);
while (!stack.isEmpty())
cout << stack.pop() << endl;The example will output 3, 2, 1 in that order.
https:// inherits from https://. All of https://'s functionality also applies to https://. For example, you can use https://() to test whether the stack is empty, and you can traverse a https:// using https://'s iterator classes (for example, QVectorIterator). But in addition, https:// provides three convenience functions that make it easy to implement LIFO semantics: push(), pop(), and https://().
https://'s value type must be an https://. This covers most data types that are commonly used, but the compiler won't let you, for example, store a QWidget as a value; instead, store a QWidget *.
See Also▲
See also https://, https://
Member Function Documentation▲
[since 4.8] void QStack::swap(QStack<T> &other)▲
Swaps stack other with this stack. This operation is very fast and never fails.
This function was introduced in Qt 4.8.
T &QStack::top()▲
Returns a reference to the stack's top item. This function assumes that the stack isn't empty.
This is the same as https://().
See Also▲
See also pop(), https://, isEmpty()