ginac/fail.h

   1 /** @file fail.h
   2  *
   3  *  Interface to class signaling failure of operation. Considered obsolete all
   4  *  this stuff ought to be replaced by exceptions. */
   5
   6 #ifndef _FAIL_H_
   7 #define _FAIL_H_
   8
   9 class fail;
  10
  11 #include "basic.h"
  12 #include "flags.h"
  13
  14 class fail : public basic
  15 {
  16
  17 // member functions
  18
  19     // default constructor, destructor, copy constructor assignment operator and helpers
  20 public:
  21     fail();
  22     ~fail();
  23     fail(fail const & other);
  24     fail const & operator=(fail const & other);
  25 protected:
  26     void copy(fail const & other);
  27     void destroy(bool call_parent);
  28
  29     // other constructors
  30     // none
  31
  32     // functions overriding virtual functions from bases classes
  33 public:
  34     basic * duplicate() const;
  35     void printraw(ostream & os) const;
  36     void print(ostream & os, unsigned upper_precedence=0) const;
  37 protected:
  38     int compare_same_type(basic const & other) const;
  39     unsigned return_type(void) const { return return_types::noncommutative_composite; };
  40
  41     // new virtual functions which can be overridden by derived classes
  42     // none
  43
  44     // non-virtual functions in this class
  45     // none
  46
  47 // member variables
  48 // none
  49 };
  50
  51 // global constants
  52
  53 extern const fail some_fail;
  54 extern type_info const & typeid_fail;
  55
  56 #endif // ndef _FAIL_H_
  57
  58