* Adjusted Debinization.

[ginac.git] / ginac / fail.h

diff --git a/ginac/fail.h b/ginac/fail.h
index 5b9c2147f8ff1fb32eb776549e4a79e5f3f2f5b7..125788d533731f09a6c986754a650c0fcc9904b5 100644 (file)
--- 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__