Deep Exploration C + + object model notes (1)--new and delete operators

int New int (5);

The new operation is actually made up of two steps:

(1) Configure the required memory with the appropriate new operator function entity.

Call the new operator in the function library.

int New sizeof int ) );

(2) Set an initial value for the configured object.

5;

Initialization should be performed only after the memory configuration succeeds (via the new operator).

1 int *pi; 2 3 if sizeof (int))) 4 5 5 // In two steps

In a similar way;

Delete Pi; if 0 ) __delete (pi);

Note that pi is not automatically cleared 0 (NULL).

So if you have the following actions:

if 5 ( ) {  //...}

will be legal (but unpredictable).

Delete Ends the life of the object that the pi points to, so it should not be processed later.

When new is working on a class:

New Point3D;

is converted to:

Point3D *origin; // Pseudo Code if sizeof  = Point3D::P Oint3d (Origin);

Deep Exploration C + + object model notes (1)--new and delete operators