fixed operator precedence
[ginac.git] / ginac / ncmul.cpp
index dd0c7bdc07d0fee84c03ade49504b13375c16a3c..ccc91c490d4be13f853739e61b8d423c076e6fe4 100644 (file)
@@ -3,7 +3,7 @@
  *  Implementation of GiNaC's non-commutative products of expressions. */
 
 /*
- *  GiNaC Copyright (C) 1999-2003 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2004 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
 #include "add.h"
 #include "mul.h"
 #include "matrix.h"
-#include "print.h"
 #include "archive.h"
 #include "utils.h"
 
 namespace GiNaC {
 
-GINAC_IMPLEMENT_REGISTERED_CLASS(ncmul, exprseq)
+GINAC_IMPLEMENT_REGISTERED_CLASS_OPT(ncmul, exprseq,
+  print_func<print_context>(&ncmul::do_print).
+  print_func<print_tree>(&ncmul::do_print_tree).
+  print_func<print_csrc>(&ncmul::do_print_csrc).
+  print_func<print_python_repr>(&ncmul::do_print_csrc))
+
 
 //////////
 // default constructor
@@ -85,7 +89,7 @@ ncmul::ncmul(const exvector & v, bool discardable) : inherited(v,discardable)
        tinfo_key = TINFO_ncmul;
 }
 
-ncmul::ncmul(exvector * vp) : inherited(vp)
+ncmul::ncmul(std::auto_ptr<exvector> vp) : inherited(vp)
 {
        tinfo_key = TINFO_ncmul;
 }
@@ -102,26 +106,15 @@ DEFAULT_ARCHIVING(ncmul)
 
 // public
 
-void ncmul::print(const print_context & c, unsigned level) const
+void ncmul::do_print(const print_context & c, unsigned level) const
 {
-       if (is_a<print_tree>(c)) {
-
-               inherited::print(c, level);
-
-       } else if (is_a<print_csrc>(c) || is_a<print_python_repr>(c)) {
-
-               c.s << class_name() << "(";
-               exvector::const_iterator it = seq.begin(), itend = seq.end()-1;
-               while (it != itend) {
-                       it->print(c, precedence());
-                       c.s << ",";
-                       it++;
-               }
-               it->print(c, precedence());
-               c.s << ")";
+       printseq(c, '(', '*', ')', precedence(), level);
+}
 
-       } else
-               printseq(c, '(', '*', ')', precedence(), level);
+void ncmul::do_print_csrc(const print_context & c, unsigned level) const
+{
+       c.s << class_name();
+       printseq(c, '(', ',', ')', precedence(), precedence());
 }
 
 bool ncmul::info(unsigned inf) const
@@ -134,7 +127,8 @@ typedef std::vector<int> intvector;
 ex ncmul::expand(unsigned options) const
 {
        // First, expand the children
-       exvector expanded_seq = expandchildren(options);
+       std::auto_ptr<exvector> vp = expandchildren(options);
+       const exvector &expanded_seq = vp.get() ? *vp : this->seq;
        
        // Now, look for all the factors that are sums and remember their
        // position and number of terms.
@@ -158,9 +152,13 @@ ex ncmul::expand(unsigned options) const
        }
 
        // If there are no sums, we are done
-       if (number_of_adds == 0)
-               return (new ncmul(expanded_seq, true))->
-                       setflag(status_flags::dynallocated | (options == 0 ? status_flags::expanded : 0));
+       if (number_of_adds == 0) {
+               if (vp.get())
+                       return (new ncmul(vp))->
+                               setflag(status_flags::dynallocated | (options == 0 ? status_flags::expanded : 0));
+               else
+                       return *this;
+       }
 
        // Now, form all possible products of the terms of the sums with the
        // remaining factors, and add them together
@@ -427,7 +425,7 @@ ex ncmul::eval(int level) const
 ex ncmul::evalm() const
 {
        // Evaluate children first
-       exvector *s = new exvector;
+       std::auto_ptr<exvector> s(new exvector);
        s->reserve(seq.size());
        exvector::const_iterator it = seq.begin(), itend = seq.end();
        while (it != itend) {
@@ -446,7 +444,6 @@ ex ncmul::evalm() const
                        prod = prod.mul(ex_to<matrix>(*it));
                        it++;
                }
-               delete s;
                return prod;
        }
 
@@ -459,11 +456,30 @@ ex ncmul::thiscontainer(const exvector & v) const
        return (new ncmul(v))->setflag(status_flags::dynallocated);
 }
 
-ex ncmul::thiscontainer(exvector * vp) const
+ex ncmul::thiscontainer(std::auto_ptr<exvector> vp) const
 {
        return (new ncmul(vp))->setflag(status_flags::dynallocated);
 }
 
+ex ncmul::conjugate() const
+{
+       if (return_type() != return_types::noncommutative) {
+               return exprseq::conjugate();
+       }
+
+       if ((return_type_tinfo() & 0xffffff00U) != TINFO_clifford) {
+               return exprseq::conjugate();
+       }
+
+       exvector ev;
+       ev.reserve(nops());
+       for (const_iterator i=end(); i!=begin();) {
+               --i;
+               ev.push_back(i->conjugate());
+       }
+       return (new ncmul(ev, true))->setflag(status_flags::dynallocated).eval();
+}
+
 // protected
 
 /** Implementation of ex::diff() for a non-commutative product. It applies
@@ -550,16 +566,34 @@ unsigned ncmul::return_type_tinfo() const
 // non-virtual functions in this class
 //////////
 
-exvector ncmul::expandchildren(unsigned options) const
+std::auto_ptr<exvector> ncmul::expandchildren(unsigned options) const
 {
-       exvector s;
-       s.reserve(seq.size());
-       exvector::const_iterator it = seq.begin(), itend = seq.end();
-       while (it != itend) {
-               s.push_back(it->expand(options));
-               it++;
+       const_iterator cit = this->seq.begin(), end = this->seq.end();
+       while (cit != end) {
+               const ex & expanded_ex = cit->expand(options);
+               if (!are_ex_trivially_equal(*cit, expanded_ex)) {
+
+                       // copy first part of seq which hasn't changed
+                       std::auto_ptr<exvector> s(new exvector(this->seq.begin(), cit));
+                       reserve(*s, this->seq.size());
+
+                       // insert changed element
+                       s->push_back(expanded_ex);
+                       ++cit;
+
+                       // copy rest
+                       while (cit != end) {
+                               s->push_back(cit->expand(options));
+                               ++cit;
+                       }
+
+                       return s;
+               }
+
+               ++cit;
        }
-       return s;
+
+       return std::auto_ptr<exvector>(0); // nothing has changed
 }
 
 const exvector & ncmul::get_factors() const