内容

• 公共函数
• 重实现公共函数
• 重实现保护函数
• 详细描述

Q3PtrStack Class

The Q3PtrStack 类是提供堆栈的模板类。 更多...

头：	#include <Q3PtrStack>
继承：	Q3PtrCollection

• 所有成员列表，包括继承成员

公共函数

	Q3PtrStack ()
	Q3PtrStack (const Q3PtrStack<type> & s )
	~Q3PtrStack ()
bool	autoDelete () const
type *	current () const
bool	isEmpty () const
type *	pop ()
void	push (const type * d )
bool	remove ()
void	setAutoDelete (bool enable )
type *	top () const
	operator type * () const
Q3PtrStack<type> &	operator= (const Q3PtrStack<type> & s )

重实现公共函数

virtual void	clear ()
virtual uint	count () const

• 4 公共函数继承自 Q3PtrCollection

重实现保护函数

virtual QDataStream &	read (QDataStream & s , Q3PtrCollection::Item & item )
virtual QDataStream &	write (QDataStream & s , Q3PtrCollection::Item item ) const

• 2 保护函数继承自 Q3PtrCollection

详细描述

The Q3PtrStack 类是提供堆栈的模板类。

Q3ValueStack is an STL-compatible alternative to this class.

Define a template instance Q3PtrStack <X> to create a stack that operates on pointers to X, (X*).

A stack is a last in, first out (LIFO) structure. Items are added to the top of the stack with push () and retrieved from the top with pop ()。使用 top () to get a reference to the top element without changing the stack.

You can control the stack's deletion policy with setAutoDelete ().

For compatibility with the Q3PtrCollection 类 current () 和 remove () are provided; they both operate on the top ().

另请参阅 Q3PtrList and Q3PtrQueue .

成员函数文档编制

Q3PtrStack:: Q3PtrStack ()

Creates an empty stack.

Q3PtrStack:: Q3PtrStack (const Q3PtrStack < type > & s )

Creates a stack by making a shallow copy of another stack s .

Q3PtrStack:: ~Q3PtrStack ()

Destroys the stack. All items will be deleted if autoDelete () 为 true。

bool Q3PtrStack:: autoDelete () const

如同 Q3PtrCollection::autoDelete (). Returns true if the auto-delete option is set. If the option is set, the stack auto-deletes its contents.

另请参阅 setAutoDelete ().

[虚拟] void Q3PtrStack:: clear ()

重实现自 Q3PtrCollection::clear ().

Removes all items from the stack, deleting them if autoDelete () 为 true。

另请参阅 remove ().

[虚拟] uint Q3PtrStack:: count () const

重实现自 Q3PtrCollection::count ().

Returns the number of items in the stack.

另请参阅 isEmpty ().

type * Q3PtrStack:: current () const

Returns a pointer to the top item on the stack (most recently pushed). The stack is not changed. Returns 0 if the stack is empty.

bool Q3PtrStack:: isEmpty () const

Returns true if the stack contains no elements; otherwise returns false.

type * Q3PtrStack:: pop ()

Removes the top item from the stack and returns it. The stack must not be empty.

void Q3PtrStack:: push (const type * d )

Adds an element d to the top of the stack. Last in, first out.

[virtual protected] QDataStream & Q3PtrStack:: read ( QDataStream & s , Q3PtrCollection::Item & item )

Reads a stack item, item , from the stream s 并返回流引用。

The default implementation sets item 为 0。

另请参阅 write ().

bool Q3PtrStack:: remove ()

Removes the top item from the stack and deletes it if autoDelete () is true. Returns true if there was an item to pop; otherwise returns false.

另请参阅 clear ().

void Q3PtrStack:: setAutoDelete ( bool enable )

Defines whether this stack auto-deletes its contents. The same as Q3PtrCollection::setAutoDelete ()。若 enable is true, auto-delete is turned on.

If auto-deleting is turned on, all the items in the stack are deleted when the stack itself is deleted. This is convenient if the stack has the only pointers to the items.

The default setting is false, for safety. If you turn it on, be careful about copying the stack, or you might find yourself with two stacks deleting the same items.

Note that the auto-delete setting may also affect other functions in subclasses. For example, a subclass that has a remove () function will remove the item from its data structure, and if auto-delete is enabled, will also delete the item.

另请参阅 autoDelete ().

type * Q3PtrStack:: top () const

Returns a pointer to the top item on the stack (most recently pushed). The stack is not changed. Returns 0 if the stack is empty.

[virtual protected] QDataStream & Q3PtrStack:: write ( QDataStream & s , Q3PtrCollection::Item item ) const

Writes a stack item, item , to the stream s 并返回流引用。

默认实现什么都不做。

另请参阅 read ().

Q3PtrStack:: operator type * () const

Returns a pointer to the top item on the stack (most recently pushed). The stack is not changed. Returns 0 if the stack is empty.

Q3PtrStack < type > & Q3PtrStack:: operator= (const Q3PtrStack < type > & s )

Sets the contents of this stack by making a shallow copy of another stack s . Elements currently in this stack will be deleted if autoDelete () 为 true。