- Instead of just totally symmetric or antisymmetric, complex symmetries

[ginac.git] / ginac / basic.h

diff --git a/ginac/basic.h b/ginac/basic.h
index 9199e34c5634f0101e147eaa1f597807cd08353b..4ace75fd6d9289ee1c79fd4796768b10f113250d 100644 (file)
--- a/ginac/basic.h
+++ b/ginac/basic.h
@@ -47,7 +47,14 @@ class print_context;
 
 typedef std::vector<ex> exvector;
 
-typedef ex (*map_func)(const ex & e);
+
+/** Function object for map(). */
+struct map_function {
+       typedef const ex & argument_type;
+       typedef ex result_type;
+       virtual ex operator()(const ex & e) = 0;
+};
+
 
 /** This class is the ABC (abstract base class) of GiNaC's class hierarchy.
  *  It is responsible for the reference counting. */
@@ -106,7 +113,7 @@ public: // only const functions please (may break reference counting)
        virtual ex operator[](const ex & index) const;
        virtual ex operator[](int i) const;
        virtual bool has(const ex & other) const;
-       virtual ex map(map_func f) const;
+       virtual ex map(map_function & f) const;
        virtual int degree(const ex & s) const;
        virtual int ldegree(const ex & s) const;
        virtual ex coeff(const ex & s, int n = 1) const;