* Interface to relations between expressions. */
/*
- * GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
+ * GiNaC Copyright (C) 1999-2022 Johannes Gutenberg University Mainz, Germany
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#ifndef __GINAC_RELATIONAL_H__
-#define __GINAC_RELATIONAL_H__
+#ifndef GINAC_RELATIONAL_H
+#define GINAC_RELATIONAL_H
#include "basic.h"
#include "ex.h"
+#include "archive.h"
namespace GiNaC {
greater_or_equal
};
- // other ctors
+ // other constructors
public:
relational(const ex & lhs, const ex & rhs, operators oper=equal);
- // 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;
- unsigned precedence(void) const {return 20;}
- bool info(unsigned inf) const;
- unsigned nops() const;
- ex & let_op(int i);
- ex eval(int level=0) const;
- ex evalf(int level=0) const;
- ex normal(lst &sym_lst, lst &repl_lst, int level=0) const;
- ex simplify_ncmul(const exvector & v) const;
+ unsigned precedence() const override {return 20;}
+ bool info(unsigned inf) const override;
+ size_t nops() const override;
+ ex op(size_t i) const override;
+ ex map(map_function & f) const override;
+ ex subs(const exmap & m, unsigned options = 0) const override;
+
+ /** Save (a.k.a. serialize) object into archive. */
+ void archive(archive_node& n) const override;
+ /** Read (a.k.a. deserialize) object from archive. */
+ void read_archive(const archive_node& n, lst& syms) override;
+ ex canonical() const;
+
protected:
- unsigned return_type(void) const;
- unsigned return_type_tinfo(void) const;
+ ex eval_ncmul(const exvector & v) const override;
+ bool match_same_type(const basic & other) const override;
+ unsigned return_type() const override;
+ return_type_t return_type_tinfo() const override;
+ unsigned calchash() const override;
// new virtual functions which can be overridden by derived classes
+protected:
+ void do_print(const print_context & c, unsigned level) const;
+ void do_print_python_repr(const print_python_repr & c, unsigned level) const;
+
public:
- virtual ex lhs(void) const;
- virtual ex rhs(void) const;
+ ex lhs() const { return lh; }
+ ex rhs() const { return rh; }
// non-virtual functions in this class
-public:
- operator bool(void) const;
+private:
+ // For conversions to Boolean, as would be used in an if conditional,
+ // implicit conversions from bool to int have a large number of
+ // undesirable side effects. The following safe_bool type enables
+ // use of relational objects in conditionals without those side effects
+ struct safe_bool_helper {
+ void nonnull() {};
+ };
+
+ typedef void (safe_bool_helper::*safe_bool)();
+ safe_bool make_safe_bool(bool) const;
+
+public:
+ operator safe_bool() const;
+ safe_bool operator!() const;
+
// member variables
protected:
ex rh;
operators o;
};
+GINAC_DECLARE_UNARCHIVER(relational);
// utility functions
-/** Return the relational object handled by an ex. Deprecated: use ex_to<relational>().
- * This is unsafe: you need to check the type first. */
-inline const relational &ex_to_relational(const ex &e)
-{
- return static_cast<const relational &>(*e.bp);
-}
-
-/** Specialization of is_exactly_a<relational>(obj) for relational objects. */
-template<> inline bool is_exactly_a<relational>(const basic & obj)
+// inlined functions for efficiency
+inline relational::safe_bool relational::operator!() const
{
- return obj.tinfo()==TINFO_relational;
+ return make_safe_bool(!static_cast<bool>(*this));
}
} // namespace GiNaC
-#endif // ndef __GINAC_RELATIONAL_H__
+#endif // ndef GINAC_RELATIONAL_H