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Jidong Xiao
2023-09-18 21:52:39 -04:00
parent 9ba344c583
commit 53080f3930
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lectures/06_memory/README.md
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@@ -21,11 +21,14 @@ static int counter;
## 6.2 Dynamic Memory ## 6.2 Dynamic Memory
Dynamic memory is: Dynamic memory is:
- created using the new operator, - created using the **new** operator,
- accessed through pointers, and - accessed through pointers, and
- removed through the delete operator. - removed through the **delete** operator.
Here’s a simple example involving dynamic allocation of integers: Here’s a simple example involving dynamic allocation of integers:
<table>
<tr>
<td>
```cpp ```cpp
int * p = new int; int * p = new int;
*p = 17; *p = 17;
@@ -42,6 +45,11 @@ cout << *p << " " << *q << endl;
delete p; delete p;
delete q; delete q;
``` ```
</td>
<td><img src="heap.png" alt="heap"</td>
</tr>
</table>
<!--[alt text](heap.png "heap")-->
- The expression new int asks the system for a new chunk of memory that is large enough to hold an integer - The expression new int asks the system for a new chunk of memory that is large enough to hold an integer
and returns the address of that memory. Therefore, the statement int * p = new int; allocates memory and returns the address of that memory. Therefore, the statement int * p = new int; allocates memory