Re: class method static variable same across isntances?
"Chris ( Val )" <chrisval@gmail.com> wrote in message
news:1191685327.213462.183740@22g2000hsm.googlegroups.com...
On Oct 6, 2:32 pm, "Jim Langston" <tazmas...@rocketmail.com> wrote:
"Chris ( Val )" <chris...@gmail.com> wrote in
messagenews:1191594611.671775.251940@57g2000hsv.googlegroups.com...
On Oct 5, 9:26 am, "Jim Langston" <tazmas...@rocketmail.com> wrote:
The output of the following program for me is:
Same
0 1 2
Which is what I want. I just want to confirm this is well defined
behavior,
that a static local variable to a class function/method is the same
instance
across classes.
#include <iostream>
#include <vector>
class Foo
{
public:
std::vector<int>& Data( )
{
static std::vector<int> EmptyData;
return EmptyData;
}
int Bar()
{
static int Val = 0;
return Val++;
}
};
[snip]
Have you thought about deriving from a common base class?
E.g:
class Common
{
static std::vector<int> EmptyData;
// ...
};
class Foo : public Common
{
// ...
If you want common functionality across all instances,
it might be worth looking into something like this.
It's actually used in a method to return a reference to a set using a
form
of recursion.
[snipped code]
Ok, but how is the code you posted relevant to what I asked?
You posted an interest in finding out about a static retaining
its value across all instances of a class. I just wanted to put
forward the suggestion of using a common base class for such
things, to simplify your code and see what your thoughts were :-)
Well, my code shows how I am using the fact that a static is the same
instance across instances of the object. And how using a common base class
wouldn't help me in the least.
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