Array-based single-link list (Boost unit test)

For single-linked lists, we use pointers most of the time (refer to a single linked list based on pointer implementations). Now let's see how to use arrays to implement single-linked lists.

1. Define data structures for nodes in a single-linked list

1typedefintElementType;2 classNodeType3 {4  Public:5 ElementType data;6     intNext;7};

The node consists of two elements, one of which is the data, and the other refers to the "pointer" to the next node (in this article it is actually the subscript used to implement an array of single-linked lists.) ）

2. Define an array of

1 Const int 1024x768 ; 2 NodeType node[capacity];

The structure of the array in memory is as follows:

　　

3. Define a "pointer" to the 1th node of the single-link list

1 int head;

4. A simple single-link list example

We assume that the single-linked list has only 3 nodes, and that 3 nodes are located in the No. 0, 1, and 2 positions of the array node, respectively, from left to right, such as:

　　

The head points to the 1th node in the list. The node is stored in the No. 0 position of the array node, and data is 111,next points to the next node. others and so on.

Note that the next of the last node in the list (that is, the 3rd node in the list) is set to 1, which means that it does not point to any nodes.

　　More importantly, these three nodes can be in any position in the array node, as long as they maintain the relationship between the links.

5. Actual program implementation

In the actual program implementation, in order to make it easier to determine which element in the array has been used, I added a judgment bit to the node data structure of the original single-linked list, as follows:

1typedefintElementType;2 classNodeType3 {4  Public:5NodeType () {data =0; Next = Null_value; Isfree =true; };6~NodeType () {};7 ElementType data;8     intNext;9     BOOLIsfree;//flag bit, true indicates that the node is available, and vice versa .Ten};

The remaining procedures are excerpted as follows:

linkedlist.h Linkedlist.cpp

The Boost unit test code is tested as follows:

BoostUnitTest.cpp

　　Personal "data structures and Algorithms" series Blog:

Linear table:

Sequential table:

Sequential table of arrays based on static allocations (both boost unit test)

Sequential table based on dynamically allocated arrays (with boost unit test)

　　　　Linked list:

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Array-based single-link list (Boost unit test)