stack | Rey Rahadian

There’s two type of memory that we should know. Stack and Heap, what’s the difference ?

Stack

keeps track of the code execution contains
it uses LIFO structure
high performance memory, fixed limit
local variables goes to stack
points to an object in heap

Heap

It’s a large pool of operating system memory
used in dynamic memory allocation
garbage collector remove any resources that no longer used

let’s take a look on how stack and heap works

public void Go()
{
    MyInt x = new MyInt();
    x.MyValue = 2;

    DoSomething(x);

    Console.WriteLine(x.MyValue.ToString());
  
}

public void DoSomething(MyInt pValue)
{
    pValue.MyValue = 12345;
}

public void Go()

{

MyInt x = new MyInt();

x.MyValue = 2;

DoSomething(x);

Console.WriteLine(x.MyValue.ToString());

}

public void DoSomething(MyInt pValue)

{

pValue.MyValue = 12345;

}

when that method is called, this what’s happening in the stack

The Go() method is called
the x local variable is defined and goes to the stack, x is a pointer that point to MyInt instance in the heap
MyValue property is set, the value is stored in heap because MyValue is declared on the heap
DoSomething() method is called
the MyValue value in the heap is changed to 12345

references:

https://www.youtube.com/watch?v=clOUdVDDzIM
http://stackoverflow.com/questions/79923/what-and-where-are-the-stack-and-heap
http://www.c-sharpcorner.com/UploadFile/rmcochran/csharp_memory01122006130034PM/csharp_memory.aspx