define variable according to string
<p>How to define variable according to string. I had defined many classes.But I want to creat variable of this class according to some string.</p>

<p>The code looks like this.</p>

<pre><code>class AA {};
class BB {};
class CC {
    CC(void *pt);
    virtual ~CC();
};
......

void test(char *ss,void *pt=NULL) {
    //??????How to do?

}

int main() {
    a1=test("AA");    //a1=new AA();
    a2=test("AA");    //a2=new AA();
    b1=test("BB");    //b1=new BB();
    c1=test("CC",pt); //c1=new CC(pt);
}
</code></pre>

<p>Orther,you can consider this as URL and handle function.The std::map is common method to get instance of class according to string.But can't create a new instance to variable. I hope get a new instance according to string.</p>
