X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fconstant.h;h=bdd8d69e79d16b3a5e1612a167341d19b6786627;hp=bf85b382d6c5b38dc2e4ddc5ab89544c2209420d;hb=11c7f91bf740646e78ffa0711ef405aefca96705;hpb=f7a07ae7330a3543bb00aa7b659e2624d6c440c7

diff --git a/ginac/constant.h b/ginac/constant.h
index bf85b382..bdd8d69e 100644
--- a/ginac/constant.h
+++ b/ginac/constant.h
@@ -46,7 +46,7 @@ public:
 	constant(const std::string & initname, evalffunctype efun = 0, const std::string & texname = std::string());
 	constant(const std::string & initname, const numeric & initnumber, const std::string & texname = std::string());
 	
-	// functions overriding virtual functions from bases classes
+	// functions overriding virtual functions from base classes
 public:
 	void print(const print_context & c, unsigned level = 0) const;
 	int degree(const ex & s) const;
@@ -80,11 +80,20 @@ extern const constant Catalan;
 extern const constant Euler;
 
 // utility functions
+
+/** Return the constant object handled by an ex.  Deprecated: use ex_to<constant>().
+ *  This is unsafe: you need to check the type first. */
 inline const constant &ex_to_constant(const ex &e)
 {
 	return static_cast<const constant &>(*e.bp);
 }
 
+/** Specialization of is_exactly_a<constant>(obj) for constant objects. */
+template<> inline bool is_exactly_a<constant>(const basic & obj)
+{
+	return obj.tinfo()==TINFO_constant;
+}
+
 } // namespace GiNaC
 
 #endif // ndef __GINAC_CONSTANT_H__