3 struct ex;
6   ex eval() const;
10 struct ex {  struct
12   ex() : bp(0) { }  in ex()  argument
13   ex(const basic &);
14   virtual ~ex();
18 ex basic::eval() const {  in eval()
22 inline ex::ex(const basic &b) { construct_from_basic (b); }  in ex()  function in ex
23 inline ex::~ex() { if (--bp->refcount == 0) delete bp; }  in ~ex()
24 void ex::construct_from_basic(const basic &b) {  in construct_from_basic()
25   const ex & tmpex = b.eval();  in construct_from_basic()
30 ex pow() { return basic(); }  in pow()