Vector usage in Cocos2d-x

1. Create a vector object

• Vector (). Default constructor.

• Vector (ssize_t capacity ). Create a vector object and set the capacity.

• Vector (const vector <t> & other ). Create another vector object with an existing vector object, where & other is the reference parameter of the Left value.

• Vector (vector <t> & other ). Create another vector object with an existing vector object, where & other is the right value reference parameter.

 

2. Add Elements

Adding elements to a vector object must be of the ref object pointer type. The following is a summary of common functions:

• Void pushback (t object ). Add an element. t indicates the ref object pointer type.

• Void pushback (const vector <t> & other ). Add all elements in a vector object to the current vector object.

• Void insert (ssize_t index, t object ). Insert an element at the specified position. ssize_t is an alias of the int type.

 

3. Remove Elements

The following is a summary of common functions for removing elements from a vector <t> container:

• Void popback (). Remove the last element.

• Void eraseobject (t object, bool removeall = false ). Removes an element.

• Iterator erase (iterator position ). The object is removed at the specified position. The parameter is the iterator, And the return value is the next iterator.

• Iterator erase (iterator first, iterator last ). Specifies the range of objects to be removed (first ~ Last), the parameter is the iterator, And the return value is the next iterator.

• Iterator erase (ssize_t index ). Removes the element of a specified index. The parameter is ssize_t, And the return value is the next iterator.

• Void clear (). Remove all elements.

 

4. Replacing and exchanging Elements

We can also use the following function to replace and exchange elements in a vector container:

• Void swap (T object1, t object2 ). Exchange two elements.

• Void swap (ssize_t index1, ssize_t index2 ). Swap two specified position elements.

• Void Replace (ssize_t index, t object ). Replaces the specified position element with an object.

 

5. Search operations

We sometimes need to operate the elements in the vector. Below is a summary of common search functions:

• Iterator find (t object ). Search for objects in the vector container and return value iterator.

• T At (ssize_t index ). Returns the elements in the vector container Based on the index position.

• T front (). Returns the first element.

• T back (). Returns the last element.

• T getrandomobject (). Returns a random element.

• Bool contains (t object ). Returns whether an element exists in the container.

• Ssize_t getindex (t object ). Returns the location of the specified object.

 

6. Other operation functions

In addition, there are many vector object functions. Below is a summary of common functions:

• Ssize_t size (). Returns the number of elements.

• Ssize_t capacity (). Returns the vector capacity.

Vector usage in Cocos2d-x