Re: address of virtual member function passed as template argument

From:
"Ben Voigt" <rbv@nospam.nospam>
Newsgroups:
microsoft.public.vc.language
Date:
Mon, 19 Mar 2007 13:06:24 -0500
Message-ID:
<en9ByDlaHHA.3612@TK2MSFTNGP04.phx.gbl>

The problem is that this doesn't fit my needs. But thank you for your
response.
I want to use Boost.Property and therefor it need to pass those
addresses to boost::property::object_property<...>

consider the following example:
<code>
class foo
{
private:
int value;

public:
int getValue() const { return value; }
void setValue(const int& v) { value = v; }

boost::scalar_property< boost::object_property
<
char, foo,
&foo::getValue,
&foo::setValue

Value;

};
</code>

If you make getValue() oder setValue() virtual, it crashes.
Well, i could pass pointers to getValue and setValue to the property
using it's custuctor at RunTime.
But i had to write my own property-lib for that and (more importantly)
it wouldn't fit into my OOP-system that well. (would be better if
every devired class _had_ to use getValue and setValue for their
properties)


How about:

class foo
 {
 private:
 int value;

 int proxygetValue() const { return getValue(); }
 void proxysetValue(const int& v) { setValue(v); }
 public:
 virtual int getValue() const { return value; }
 virtual void setValue(const int& v) { value = v; }

boost::scalar_property< boost::object_property
 <
char, foo,
&foo::proxygetValue,
 &foo::proxysetValue
 > > Value;
 };

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