if (Obj) do

This is a discussion on if (Obj) do within the C# Programming forums, part of the General Programming Boards category; This is one of those trivia topics about the language features. In C you could do Code: if (obj) {...} ...

  1. #1
    Registered User C_ntua's Avatar
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    if (Obj) do

    This is one of those trivia topics about the language features.

    In C you could do
    Code:
    if (obj) {...}
    In C# you have to do
    Code:
    if (obj != null) {...}
    The funny thing is that C is a more object oriented style approach. It practically uses an overloaded if() when C# has an if for only logical operations and bool values (not for pointers and references).

    If there had to be a separation between bool and references, I would choose to have the bool variables have a == true in an if. Makes more sense for me. You read if(obj) as "if this object (exists)" rather than "if this obj is true". And if (obj != null) would read "if the value of this obj is not equal to null" mixing objects with values.

    What do you think? Except the obvious answer "I have better things to do in my life"

  2. #2
    Registered User valaris's Avatar
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    I think it's just an obvious extension of how C# handles if (). C doesn't use an "overloaded" if at all, it is only following its language construct of 0 for false, anything else true. Even though if (obj != null) is a bit longer to type, its also clearer in its intentions. Not to mention I think overall if you've spent a deal of time in c#, most programming tasks are still quicker to write then in C.

    Either way "that's the way the cookie crumbles". =-D

  3. #3
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    Someone's clearly missing the point.

  4. #4
    Registered User C_ntua's Avatar
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    Quote Originally Posted by MWAAAHAAA View Post
    Someone's clearly missing the point.
    That could be any one of us, not clear who you mean

  5. #5
    Super Moderator VirtualAce's Avatar
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    I also often wonder why C# won't allow if (obj) and haven't yet found a good reason why it does not allow it. Obviously 'if' statements are evaluated a bit differently but it does annoy me that I must use the longer version.

  6. #6
    Confused Magos's Avatar
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    You could do like this:
    Code:
    public class Test
    {
    	public Test()
    	{
    	}
    
    	public static implicit operator bool(Test t)
    	{
    		return (t != null);
    	}
    }
    
    var t = new Test();
    
    if(t)
    {
    	System.Windows.Forms.MessageBox.Show("Hey it's true!");
    }
    
    t = null;
    
    if(!t)
    {
    	System.Windows.Forms.MessageBox.Show("And now it's false!");
    }
    MagosX.com

    Give a man a fish and you feed him for a day.
    Teach a man to fish and you feed him for a lifetime.

  7. #7
    Registered User C_ntua's Avatar
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    Couldn't that be built in? Well, MS I guess had its reasons but I simply cannot imagine them.

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