Re: Member function pointer, delegates

From:
=?UTF-8?B?RXJpayBXaWtzdHLDtm0=?= <Erik-wikstrom@telia.com>
Newsgroups:
comp.lang.c++
Date:
Thu, 04 Oct 2007 10:56:42 GMT
Message-ID:
<KF3Ni.10385$ZA.6968@newsb.telia.net>
On 2007-10-04 10:53, mosfet wrote:

Ian Collins a ??crit :

mosfet wrote:

Hi,

In my project I am supposed to test if some HTTP headers belongs to a
know list of system headers so I wrote the following code.
I get a WebRequest class(ported from .net world) and a HttpWebRequest
deriving from it.
In my WebRequest I have some getters/setters defined like this
:

typedef std::basic_string<TCHAR> tstring;


What's a TCHAR and isn't there an alternative standard type?

#define DECL_GET_PROP( PropName, Type ) \
    Type& get_##PropName() { return m_##PropName; }


<snip>

class WebRequest
{
public:
....
// Properties
virtual DECL_GETSET_PROP(Accept, tstring);


<snip>

....
};
I know macros are evil but in my case I find it useful, so the first
line for instance will be expanded as :
virtual tstring& get_Accept() { return m_Accept; }
virtual void set_Accept(tstring PropVal) {m_Accept = PropVal; }


It's not the macros that would bother me, its the presence of all the
setter and getter methods, which tent to be indicative of a poor design.

The problem is my get/set methods don't have the same signature, for
instance Accept takes a string while ContentLength takes a long.
My question is how to solve this ?
Should I use delegated instaead of member function pointers ?


There you are, there is a problem with the design! You probably want to
look at the factory pattern, with a process object for each header item,
build a list of header objects for each message and process that.


It's not my design, tell Microsoft they have bad design in their .NET
languages.


If you are using the .Net Framework you should use C++/CLR, you will
probably never get it to work correctly with standard C++. For more help
with C++/CLR ask in one of the microsoft.public.* newsgroups or on
http://forums.microsoft.com/.

--
Erik Wikstr??m

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