- added find() (like has(), but returns list of all occurrences)

[ginac.git] / ginac / symbol.h

diff --git a/ginac/symbol.h b/ginac/symbol.h
index aec27aee7d99af180a23fec62757341b6f7f00bb..16c3193313df3277d6337aa464c824b7ad39273c 100644 (file)
--- a/ginac/symbol.h
+++ b/ginac/symbol.h
@@ -75,12 +75,11 @@ public:
        basic * duplicate() const;
        void print(const print_context & c, unsigned level = 0) const;
        bool info(unsigned inf) const;
-       ex expand(unsigned options = 0) const;
-       bool has(const ex & other) const;
        int degree(const ex & s) const;
        int ldegree(const ex & s) const;
        ex coeff(const ex & s, int n = 1) const;
        ex eval(int level = 0) const;
+       ex evalf(int level = 0) const { return *this; } // overwrites basic::evalf() for performance reasons
        ex series(const relational & s, int order, unsigned options = 0) const;
        ex normal(lst &sym_lst, lst &repl_lst, int level = 0) const;
        ex to_rational(lst &repl_lst) const;
@@ -115,11 +114,24 @@ private:
 
 
 // utility functions
+
+/** Return the symbol object handled by an ex.  Deprecated: use ex_to<symbol>().
+ *  This is unsafe: you need to check the type first. */
 inline const symbol &ex_to_symbol(const ex &e)
 {
        return static_cast<const symbol &>(*e.bp);
 }
 
+inline symbol &ex_to_nonconst_symbol(const ex &e)
+{
+       return static_cast<symbol &>(*e.bp);
+}
+
+/** Specialization of is_exactly_a<symbol>(obj) for symbol objects. */
+template<> inline bool is_exactly_a<symbol>(const basic & obj)
+{
+       return obj.tinfo()==TINFO_symbol;
+}
 
 // wrapper functions around member functions
 inline void unassign(symbol & symarg)