X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Foperators.cpp;h=c83f09a154502ece4dcfdab3c440a05208d3e2b9;hp=b589c3c450b00d1dfb3d504f7866ce19e425082e;hb=f2a55a878a7e944ecb1a56134661e301e896cf39;hpb=a8507b8af1c08d9b27d98d57f95c7ca1a8671e27

diff --git a/ginac/operators.cpp b/ginac/operators.cpp
index b589c3c4..c83f09a1 100644
--- a/ginac/operators.cpp
+++ b/ginac/operators.cpp
@@ -1,8 +1,9 @@
 /** @file operators.cpp
  *
- *  Implementation of GiNaC's overloaded operators.
- *
- *  GiNaC Copyright (C) 1999 Johannes Gutenberg University Mainz, Germany
+ *  Implementation of GiNaC's overloaded operators. */
+
+/*
+ *  GiNaC Copyright (C) 1999-2002 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
@@ -19,381 +20,269 @@
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
-#include <iostream>
-#include <stdexcept>
-
-#include "ginac.h"
-
-// binary arithmetic operators ex with ex
-
-ex operator+(ex const & lh, ex const & rh)
-{
-    debugmsg("operator+(ex,ex)",LOGLEVEL_OPERATOR);
-    return lh.exadd(rh);
-}
-
-ex operator-(ex const & lh, ex const & rh)
-{
-    debugmsg("operator-(ex,ex)",LOGLEVEL_OPERATOR);
-    return lh.exadd(rh.exmul(exMINUSONE()));
-}
-
-ex operator*(ex const & lh, ex const & rh)
-{
-    debugmsg("operator*(ex,ex)",LOGLEVEL_OPERATOR);
-    return lh.exmul(rh);
-}
-
-ex operator/(ex const & lh, ex const & rh)
-{
-    debugmsg("operator*(ex,ex)",LOGLEVEL_OPERATOR);
-    return lh.exmul(power(rh,exMINUSONE()));
-}
-
-ex operator%(ex const & lh, ex const & rh)
-{
-    debugmsg("operator%(ex,ex)",LOGLEVEL_OPERATOR);
-    return lh.exncmul(rh);
-}
-
-/*
-
-// binary arithmetic operators ex with numeric
-
-ex operator+(ex const & lh, numeric const & rh)
-{
-    debugmsg("operator+(ex,numeric)",LOGLEVEL_OPERATOR);
-    return lh+ex(rh);
-}
+#include "operators.h"
+#include "numeric.h"
+#include "add.h"
+#include "mul.h"
+#include "power.h"
+#include "ncmul.h"
+#include "relational.h"
+#include "print.h"
+#include "utils.h"
 
-ex operator-(ex const & lh, numeric const & rh)
-{
-    debugmsg("operator-(ex,numeric)",LOGLEVEL_OPERATOR);
-    return lh-ex(rh);
-}
+namespace GiNaC {
 
-ex operator*(ex const & lh, numeric const & rh)
+/** Used internally by operator+() to add two ex objects together. */
+static inline const ex exadd(const ex & lh, const ex & rh)
 {
-    debugmsg("operator*(ex,numeric)",LOGLEVEL_OPERATOR);
-    return lh*ex(rh);
+	return (new add(lh,rh))->setflag(status_flags::dynallocated);
 }
 
-ex operator/(ex const & lh, numeric const & rh)
+/** Used internally by operator*() to multiply two ex objects together. */
+static inline const ex exmul(const ex & lh, const ex & rh)
 {
-    debugmsg("operator/(ex,numeric)",LOGLEVEL_OPERATOR);
-    return lh/ex(rh);
+	// Check if we are constructing a mul object or a ncmul object.  Due to
+	// ncmul::eval()'s rule to pull out commutative elements we need to check
+	// only one of the elements.
+	if (rh.return_type()==return_types::commutative ||
+	    lh.return_type()==return_types::commutative)
+		return (new mul(lh,rh))->setflag(status_flags::dynallocated);
+	else
+		return (new ncmul(lh,rh))->setflag(status_flags::dynallocated);
 }
 
-ex operator%(ex const & lh, numeric const & rh)
+/** Used internally by operator-() and friends to change the sign of an argument. */
+static inline const ex exminus(const ex & lh)
 {
-    debugmsg("operator%(ex,numeric)",LOGLEVEL_OPERATOR);
-    return lh%ex(rh);
+	return (new mul(lh,_ex_1))->setflag(status_flags::dynallocated);
 }
 
-// binary arithmetic operators numeric with ex
-
-ex operator+(numeric const & lh, ex const & rh)
-{
-    debugmsg("operator+(numeric,ex)",LOGLEVEL_OPERATOR);
-    return ex(lh)+rh;
-}
+// binary arithmetic operators ex with ex
 
-ex operator-(numeric const & lh, ex const & rh)
+const ex operator+(const ex & lh, const ex & rh)
 {
-    debugmsg("operator-(numeric,ex)",LOGLEVEL_OPERATOR);
-    return ex(lh)-rh;
+	return exadd(lh, rh);
 }
 
-ex operator*(numeric const & lh, ex const & rh)
+const ex operator-(const ex & lh, const ex & rh)
 {
-    debugmsg("operator*(numeric,ex)",LOGLEVEL_OPERATOR);
-    return ex(lh)*rh;
+	return exadd(lh, exminus(rh));
 }
 
-ex operator/(numeric const & lh, ex const & rh)
+const ex operator*(const ex & lh, const ex & rh)
 {
-    debugmsg("operator/(numeric,ex)",LOGLEVEL_OPERATOR);
-    return ex(lh)/rh;
+	return exmul(lh, rh);
 }
 
-ex operator%(numeric const & lh, ex const & rh)
+const ex operator/(const ex & lh, const ex & rh)
 {
-    debugmsg("operator%(numeric,ex)",LOGLEVEL_OPERATOR);
-    return ex(lh)%rh;
+	return exmul(lh, power(rh,_ex_1));
 }
 
-*/
 
 // binary arithmetic operators numeric with numeric
 
-numeric operator+(numeric const & lh, numeric const & rh)
+const numeric operator+(const numeric & lh, const numeric & rh)
 {
-    debugmsg("operator+(numeric,numeric)",LOGLEVEL_OPERATOR);
-    return lh.add(rh);
+	return lh.add(rh);
 }
 
-numeric operator-(numeric const & lh, numeric const & rh)
+const numeric operator-(const numeric & lh, const numeric & rh)
 {
-    debugmsg("operator-(numeric,numeric)",LOGLEVEL_OPERATOR);
-    return lh.sub(rh);
+	return lh.sub(rh);
 }
 
-numeric operator*(numeric const & lh, numeric const & rh)
+const numeric operator*(const numeric & lh, const numeric & rh)
 {
-    debugmsg("operator*(numeric,numeric)",LOGLEVEL_OPERATOR);
-    return lh.mul(rh);
+	return lh.mul(rh);
 }
 
-numeric operator/(numeric const & lh, numeric const & rh)
+const numeric operator/(const numeric & lh, const numeric & rh)
 {
-    debugmsg("operator/(numeric,ex)",LOGLEVEL_OPERATOR);
-    return lh.div(rh);
+	return lh.div(rh);
 }
 
-// binary arithmetic assignment operators with ex
 
-ex const & operator+=(ex & lh, ex const & rh)
-{
-    debugmsg("operator+=(ex,ex)",LOGLEVEL_OPERATOR);
-    return (lh=lh+rh);
-}
+// binary arithmetic assignment operators with ex
 
-ex const & operator-=(ex & lh, ex const & rh)
+ex & operator+=(ex & lh, const ex & rh)
 {
-    debugmsg("operator-=(ex,ex)",LOGLEVEL_OPERATOR);
-    return (lh=lh-rh);
+	return lh = exadd(lh, rh);
 }
 
-ex const & operator*=(ex & lh, ex const & rh)
+ex & operator-=(ex & lh, const ex & rh)
 {
-    debugmsg("operator*=(ex,ex)",LOGLEVEL_OPERATOR);
-    return (lh=lh*rh);
+	return lh = exadd(lh, exminus(rh));
 }
 
-ex const & operator/=(ex & lh, ex const & rh)
+ex & operator*=(ex & lh, const ex & rh)
 {
-    debugmsg("operator/=(ex,ex)",LOGLEVEL_OPERATOR);
-    return (lh=lh/rh);
+	return lh = exmul(lh, rh);
 }
 
-ex const & operator%=(ex & lh, ex const & rh)
+ex & operator/=(ex & lh, const ex & rh)
 {
-    debugmsg("operator%=(ex,ex)",LOGLEVEL_OPERATOR);
-    return (lh=lh%rh);
+	return lh = exmul(lh, power(rh,_ex_1));
 }
 
-/*
 
 // binary arithmetic assignment operators with numeric
 
-ex const & operator+=(ex & lh, numeric const & rh)
-{
-    debugmsg("operator+=(ex,numeric)",LOGLEVEL_OPERATOR);
-    return (lh=lh+ex(rh));
-}
-
-ex const & operator-=(ex & lh, numeric const & rh)
-{
-    debugmsg("operator-=(ex,numeric)",LOGLEVEL_OPERATOR);
-    return (lh=lh-ex(rh));
-}
-
-ex const & operator*=(ex & lh, numeric const & rh)
-{
-    debugmsg("operator*=(ex,numeric)",LOGLEVEL_OPERATOR);
-    return (lh=lh*ex(rh));
-}
-
-ex const & operator/=(ex & lh, numeric const & rh)
+numeric & operator+=(numeric & lh, const numeric & rh)
 {
-    debugmsg("operator/=(ex,numeric)",LOGLEVEL_OPERATOR);
-    return (lh=lh/ex(rh));
+	lh = lh.add(rh);
+	return lh;
 }
 
-ex const & operator%=(ex & lh, numeric const & rh)
+numeric & operator-=(numeric & lh, const numeric & rh)
 {
-    debugmsg("operator%=(ex,numeric)",LOGLEVEL_OPERATOR);
-    return (lh=lh%ex(rh));
+	lh = lh.sub(rh);
+	return lh;
 }
 
-*/
-
-// binary arithmetic assignment operators with numeric
-
-numeric const & operator+=(numeric & lh, numeric const & rh)
+numeric & operator*=(numeric & lh, const numeric & rh)
 {
-    debugmsg("operator+=(numeric,numeric)",LOGLEVEL_OPERATOR);
-    return (lh=lh.add(rh));
+	lh = lh.mul(rh);
+	return lh;
 }
 
-numeric const & operator-=(numeric & lh, numeric const & rh)
+numeric & operator/=(numeric & lh, const numeric & rh)
 {
-    debugmsg("operator-=(numeric,numeric)",LOGLEVEL_OPERATOR);
-    return (lh=lh.sub(rh));
+	lh = lh.div(rh);
+	return lh;
 }
 
-numeric const & operator*=(numeric & lh, numeric const & rh)
-{
-    debugmsg("operator*=(numeric,numeric)",LOGLEVEL_OPERATOR);
-    return (lh=lh.mul(rh));
-}
-
-numeric const & operator/=(numeric & lh, numeric const & rh)
-{
-    debugmsg("operator/=(numeric,numeric)",LOGLEVEL_OPERATOR);
-    return (lh=lh.div(rh));
-}
 
 // unary operators
 
-ex operator+(ex const & lh)
+const ex operator+(const ex & lh)
 {
-    return lh;
+	return lh;
 }
 
-ex operator-(ex const & lh)
+const ex operator-(const ex & lh)
 {
-    return exMINUSONE()*lh;
+	return exminus(lh);
 }
 
-numeric operator+(numeric const & lh)
-{
-    return lh;
-}
-
-numeric operator-(numeric const & lh)
-{
-    return (numeric(-1)*lh);
-}
-
-// binary relational operators ex with ex
-
-relational operator==(ex const & lh, ex const & rh)
+const numeric operator+(const numeric & lh)
 {
-    debugmsg("operator==(ex,ex)",LOGLEVEL_OPERATOR);
-    return relational(lh,rh,relational::equal);
+	return lh;
 }
 
-relational operator!=(ex const & lh, ex const & rh)
+const numeric operator-(const numeric & lh)
 {
-    debugmsg("operator!=(ex,ex)",LOGLEVEL_OPERATOR);
-    return relational(lh,rh,relational::not_equal);
+	return _num_1.mul(lh);
 }
 
-relational operator<(ex const & lh, ex const & rh)
-{
-    debugmsg("operator<(ex,ex)",LOGLEVEL_OPERATOR);
-    return relational(lh,rh,relational::less);
-}
 
-relational operator<=(ex const & lh, ex const & rh)
-{
-    debugmsg("operator<=(ex,ex)",LOGLEVEL_OPERATOR);
-    return relational(lh,rh,relational::less_or_equal);
-}
+// increment / decrement operators
 
-relational operator>(ex const & lh, ex const & rh)
+/** Expression prefix increment.  Adds 1 and returns incremented ex. */
+ex & operator++(ex & rh)
 {
-    debugmsg("operator>(ex,ex)",LOGLEVEL_OPERATOR);
-    return relational(lh,rh,relational::greater);
+	return rh = exadd(rh, _ex1);
 }
 
-relational operator>=(ex const & lh, ex const & rh)
+/** Expression prefix decrement.  Subtracts 1 and returns decremented ex. */
+ex & operator--(ex & rh)
 {
-    debugmsg("operator>=(ex,ex)",LOGLEVEL_OPERATOR);
-    return relational(lh,rh,relational::greater_or_equal);
+	return rh = exadd(rh, _ex_1);
 }
 
-/*
-
-// binary relational operators ex with numeric
-
-relational operator==(ex const & lh, numeric const & rh)
+/** Expression postfix increment.  Returns the ex and leaves the original
+ *  incremented by 1. */
+const ex operator++(ex & lh, int)
 {
-    debugmsg("operator==(ex,numeric)",LOGLEVEL_OPERATOR);
-    return relational(lh,rh,relational::equal);
+	ex tmp(lh);
+	lh = exadd(lh, _ex1);
+	return tmp;
 }
 
-relational operator!=(ex const & lh, numeric const & rh)
+/** Expression postfix decrement.  Returns the ex and leaves the original
+ *  decremented by 1. */
+const ex operator--(ex & lh, int)
 {
-    debugmsg("operator!=(ex,numeric)",LOGLEVEL_OPERATOR);
-    return relational(lh,rh,relational::not_equal);
+	ex tmp(lh);
+	lh = exadd(lh, _ex_1);
+	return tmp;
 }
 
-relational operator<(ex const & lh, numeric const & rh)
+/** Numeric prefix increment.  Adds 1 and returns incremented number. */
+numeric& operator++(numeric & rh)
 {
-    debugmsg("operator<(ex,numeric)",LOGLEVEL_OPERATOR);
-    return relational(lh,rh,relational::less);
+	rh = rh.add(_num1);
+	return rh;
 }
 
-relational operator<=(ex const & lh, numeric const & rh)
+/** Numeric prefix decrement.  Subtracts 1 and returns decremented number. */
+numeric& operator--(numeric & rh)
 {
-    debugmsg("operator<=(ex,numeric)",LOGLEVEL_OPERATOR);
-    return relational(lh,rh,relational::less_or_equal);
+	rh = rh.add(_num_1);
+	return rh;
 }
 
-relational operator>(ex const & lh, numeric const & rh)
+/** Numeric postfix increment.  Returns the number and leaves the original
+ *  incremented by 1. */
+const numeric operator++(numeric & lh, int)
 {
-    debugmsg("operator>(ex,numeric)",LOGLEVEL_OPERATOR);
-    return relational(lh,rh,relational::greater);
+	numeric tmp(lh);
+	lh = lh.add(_num1);
+	return tmp;
 }
 
-relational operator>=(ex const & lh, numeric const & rh)
+/** Numeric postfix decrement.  Returns the number and leaves the original
+ *  decremented by 1. */
+const numeric operator--(numeric & lh, int)
 {
-    debugmsg("operator>=(ex,numeric)",LOGLEVEL_OPERATOR);
-    return relational(lh,rh,relational::greater_or_equal);
+	numeric tmp(lh);
+	lh = lh.add(_num_1);
+	return tmp;
 }
 
-// binary relational operators numeric with ex
+// binary relational operators ex with ex
 
-relational operator==(numeric const & lh, ex const & rh)
+const relational operator==(const ex & lh, const ex & rh)
 {
-    debugmsg("operator==(numeric,ex)",LOGLEVEL_OPERATOR);
-    return relational(lh,rh,relational::equal);
+	return relational(lh,rh,relational::equal);
 }
 
-relational operator!=(numeric const & lh, ex const & rh)
+const relational operator!=(const ex & lh, const ex & rh)
 {
-    debugmsg("operator!=(numeric,ex)",LOGLEVEL_OPERATOR);
-    return relational(lh,rh,relational::not_equal);
+	return relational(lh,rh,relational::not_equal);
 }
 
-relational operator<(numeric const & lh, ex const & rh)
+const relational operator<(const ex & lh, const ex & rh)
 {
-    debugmsg("operator<(numeric,ex)",LOGLEVEL_OPERATOR);
-    return relational(lh,rh,relational::less);
+	return relational(lh,rh,relational::less);
 }
 
-relational operator<=(numeric const & lh, ex const & rh)
+const relational operator<=(const ex & lh, const ex & rh)
 {
-    debugmsg("operator<=(numeric,ex)",LOGLEVEL_OPERATOR);
-    return relational(lh,rh,relational::less_or_equal);
+	return relational(lh,rh,relational::less_or_equal);
 }
 
-relational operator>(numeric const & lh, ex const & rh)
+const relational operator>(const ex & lh, const ex & rh)
 {
-    debugmsg("operator>(numeric,ex)",LOGLEVEL_OPERATOR);
-    return relational(lh,rh,relational::greater);
+	return relational(lh,rh,relational::greater);
 }
 
-relational operator>=(numeric const & lh, ex const & rh)
+const relational operator>=(const ex & lh, const ex & rh)
 {
-    debugmsg("operator>=(numeric,ex)",LOGLEVEL_OPERATOR);
-    return relational(lh,rh,relational::greater_or_equal);
+	return relational(lh,rh,relational::greater_or_equal);
 }
 
-*/
-
 // input/output stream operators
 
-ostream & operator<<(ostream & os, ex const & e)
+std::ostream & operator<<(std::ostream & os, const ex & e)
 {
-    e.print(os);
-    return os;
+	e.print(print_context(os));
+	return os;
 }
 
-istream & operator>>(istream & is, ex & e)
+std::istream & operator>>(std::istream & is, ex & e)
 {
-    throw(std::logic_error("input from streams not yet implemented"));
+	throw (std::logic_error("expression input from streams not implemented"));
 }
 
+} // namespace GiNaC