Re: [boost] [property] interest in C# like properties for C++?

Subject: Re: [boost] [property] interest in C# like properties for C++?
From: David Brownstein (dbrownstein_at_[hidden])
Date: 2009-10-22 12:22:27

The only real difference that I see between assignment-style and
function-style accessors is that if you use function-style accessors and
later you replace an automatically generated accessor with a customized
(manually generated) accessor, then all of the code that uses the original
accessor continues to work (with a recompile).

For example:

struct MyClass
{
        Property<int>		counter;
};

void foo()
{
        MyClass x;

        x.counter( 5 );
}

Now let's say that we re-define MyClass:

struct MyClass
{
        void counter( int iValue ) { counter = iValue; NotifyObserver(); }

private:
        int			counter;
};

The function foo() doesn't need to be changed. This is more difficult to do
with assignment-style accessors.

David

-----Original Message-----
From: boost-bounces_at_[hidden] [mailto:boost-bounces_at_[hidden]]
On Behalf Of Stewart, Robert
Sent: Thursday, October 22, 2009 7:11 AM
To: boost_at_[hidden]
Subject: Re: [boost] [property] interest in C# like properties for C++?

David Brownstein wrote:
>
> I also
> share your belief that using function-style accessors rather
> than assignment is preferable.

Why?  What does that syntax offer you that makes it better?  I understand
Gennadiy's notion of searching for ".value" allowing him to find cases in
which he assigns to a "property," though I fail to understand why such a
search is important.  I don't understand how parentheses help anything.

In your code, you seem to support both syntaxes:

   std::string strName = Z.Name();
   int iCount = Z.Count;
   Z.Count(3);
   Z.Count = 6;

I see nothing gained by using parentheses.

If there are to be function calls, I should think it would be functions with
names like "get_value" and "set_value," though I'd lament the added
verboseness.

_____
Rob Stewart                           robert.stewart_at_[hidden]
Software Engineer, Core Software      using std::disclaimer;
Susquehanna International Group, LLP  http://www.sig.com

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