C# 0 The Complete Reference

fixed

 prevents 

o

 from being moved. Because 

p

 points to 

o.num

, if 

o

 were moved, then 

p

 would point to an invalid location.

Accessing Structure Members Through a Pointer

A pointer can point to an object of a structure type as long as the structure does not contain 

reference types. When you access a member of a structure through a pointer, you must use 

the arrow operator, which is 

–>

, rather than the dot (

.

) operator. For example, given this 

structure,

struct MyStruct {

  public int a;

  public int b;

  public int Sum() { return a + b; }

}

you would access its members through a pointer, like this:

MyStruct o = new MyStruct();

MyStruct* p; // declare a pointer

p = &o;

p->a = 10; // use the -> operator

p->b = 20; // use the -> operator

Console.WriteLine("Sum is " + p->Sum());