X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Ffail.h;h=125788d533731f09a6c986754a650c0fcc9904b5;hp=5b9c2147f8ff1fb32eb776549e4a79e5f3f2f5b7;hb=7cf5e1f6346223de683c9e7986d098fd042d691c;hpb=444d1e293d87b78f0497a55c6a4dabad010f5b62

diff --git a/ginac/fail.h b/ginac/fail.h
index 5b9c2147..125788d5 100644
--- a/ginac/fail.h
+++ b/ginac/fail.h
@@ -1,7 +1,7 @@
 /** @file fail.h
  *
  *  Interface to class signaling failure of operation. Considered obsolete
- *  (all of this is replaced by exceptions). */
+ *  somewhat obsolete (most of this can be replaced by exceptions). */
 
 /*
  *  GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
@@ -32,13 +32,19 @@ class fail : public basic
 {
 	GINAC_DECLARE_REGISTERED_CLASS(fail, basic)
 	
-	// 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;
 protected:
 	unsigned return_type(void) const { return return_types::noncommutative_composite; };
 };
 
+/** Specialization of is_exactly_a<fail>(obj) for fail objects. */
+template<> inline bool is_exactly_a<fail>(const basic & obj)
+{
+	return obj.tinfo()==TINFO_fail;
+}
+
 } // namespace GiNaC
 
 #endif // ndef __GINAC_FAIL_H__