C#

Colin Angus Mackay wrote:

As you can see, the object of class A is passed by reference because when its property is updated in the method, the update is reflected in the Main method after the call.

static void AnotherMethod(A parameterA)        
{
    Console.WriteLine("In AnotherMethod");            
    Console.WriteLine(parameterA.SomeValue);            
    parameterA = new A();                    // Allocated new object.
    parameterA.SomeValue = "This value was set in AnotherMethod";               
    Console.WriteLine(parameterA.SomeValue);            
    Console.WriteLine("Exiting AnotherMethod");        
}

static void AnotherMethod(ref A parameterA)        
{
    Console.WriteLine("In AnotherMethod");            
    Console.WriteLine(parameterA.SomeValue);            
    parameterA = new A();                    // Allocated new object.
    parameterA.SomeValue = "This value was set in AnotherMethod";               
    Console.WriteLine(parameterA.SomeValue);            
    Console.WriteLine("Exiting AnotherMethod");        
}

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"Man who stand on hill with mouth open will wait long time for roast duck to drop in." -- Confucious

Colin Angus Mackay wrote:

Anyway, everything's sorted out now.... I hope....

void SomeMethod(int *pointer)
{
    /* Allocate memory */
    pointer = malloc(42);
}

int *p;

SomeMethod(p);

/* Oops!!! The variable p doesn't point to anything! */
p[0] = 0;

void SomeMethod(int **pointer)
{
    /* Allocate memory */
    *pointer = malloc(42);
}

int *p;

SomeMethod(&p);

/* Yay! */
p[0] = 0;

Leslie Sanford wrote:

and my C is really rusty, so pardon me if this isn't exactly correct

Leslie Sanford wrote:

Well, hopefully some of that makes sense.

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"Man who stand on hill with mouth open will wait long time for roast duck to drop in." -- Confucious

1nsp1r3d wrote:

I thought that all reference types were passed by reference and all value types by value(enums and ints/floats/etc)?

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"Man who stand on hill with mouth open will wait long time for roast duck to drop in." -- Confucious

-- modified at 11:03 Thursday 24th November, 2005

Subrahmanyam K wrote:

decimal d = 45.52
lblNetPrice.Text = Convert.ToString(d);