X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fcontainer.h;h=cc03d7d852356bc8c95155fe90fc163a2ba16db6;hp=c6a72e276d9226d76c06fe492a9879aa664248e3;hb=ab8da4fe0687969d124c2c3b3e6ce62a63376a0a;hpb=f5e84af31b20c7f732bee375bacc152e7fb01e56

diff --git a/ginac/container.h b/ginac/container.h
index c6a72e27..cc03d7d8 100644
--- a/ginac/container.h
+++ b/ginac/container.h
@@ -3,7 +3,7 @@
  *  Wrapper template for making GiNaC classes out of STL containers. */
 
 /*
- *  GiNaC Copyright (C) 1999-2003 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2009 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
@@ -17,28 +17,28 @@
  *
  *  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_CONTAINER_H__
-#define __GINAC_CONTAINER_H__
-
-#include <iterator>
-#include <stdexcept>
-#include <algorithm>
-#include <vector>
-#include <list>
+#ifndef GINAC_CONTAINER_H
+#define GINAC_CONTAINER_H
 
 #include "ex.h"
 #include "print.h"
 #include "archive.h"
 #include "assertion.h"
 
-namespace GiNaC {
+#include <algorithm>
+#include <iterator>
+#include <list>
+#include <memory>
+#include <stdexcept>
+#include <vector>
 
+namespace GiNaC {
 
 /** Helper template for encapsulating the reserve() mechanics of STL containers. */
-template <template <class> class C>
+template <template <class T, class = std::allocator<T> > class C>
 class container_storage {
 protected:
 	typedef C<ex> STLT;
@@ -66,11 +66,68 @@ template <>
 inline void container_storage<std::vector>::reserve(std::vector<ex> & v, size_t n) { v.reserve(n); }
 
 
+/** Helper template to allow initialization of containers via an overloaded
+ *  comma operator (idea stolen from Blitz++). */
+template <typename T, typename STLT>
+class container_init {
+public:
+	container_init(STLT & s) : stlt(s) {}
+
+	container_init<T, STLT> operator,(const T & x)
+	{
+		stlt.push_back(x);
+		return container_init<T, STLT>(stlt);
+	}
+
+	// The following specializations produce much tighter code than the
+	// general case above
+
+	container_init<T, STLT> operator,(int x)
+	{
+		stlt.push_back(x);
+		return container_init<T, STLT>(stlt);
+	}
+
+	container_init<T, STLT> operator,(unsigned int x)
+	{
+		stlt.push_back(x);
+		return container_init<T, STLT>(stlt);
+	}
+
+	container_init<T, STLT> operator,(long x)
+	{
+		stlt.push_back(x);
+		return container_init<T, STLT>(stlt);
+	}
+
+	container_init<T, STLT> operator,(unsigned long x)
+	{
+		stlt.push_back(x);
+		return container_init<T, STLT>(stlt);
+	}
+
+	container_init<T, STLT> operator,(double x)
+	{
+		stlt.push_back(x);
+		return container_init<T, STLT>(stlt);
+	}
+
+	container_init<T, STLT> operator,(const symbol & x)
+	{
+		stlt.push_back(T(x));
+		return container_init<T, STLT>(stlt);
+	}
+
+private:
+	container_init();
+	STLT & stlt;
+};
+
 /** Wrapper template for making GiNaC classes out of STL containers. */
-template <template <class> class C>
+template <template <class T, class = std::allocator<T> > class C>
 class container : public basic, public container_storage<C> {
 	GINAC_DECLARE_REGISTERED_CLASS(container, basic)
-
+protected:
 	typedef typename container_storage<C>::STLT STLT;
 
 public:
@@ -79,68 +136,76 @@ public:
 
 protected:
 	// helpers
-	static unsigned get_tinfo() { return TINFO_fail; }
+	static unsigned get_default_flags() { return 0; }
 	static char get_open_delim() { return '('; }
 	static char get_close_delim() { return ')'; }
 
 	// constructors
 public:
-	container(STLT const & s, bool discardable = false) : inherited(get_tinfo())
+	container(STLT const & s, bool discardable = false)
 	{
+		setflag(get_default_flags());
+
 		if (discardable)
 			this->seq.swap(const_cast<STLT &>(s));
 		else
 			this->seq = s;
 	}
 
-	explicit container(STLT * vp) : inherited(get_tinfo())
+	explicit container(std::auto_ptr<STLT> vp)
 	{
-		if (vp == 0) {
-			// lst(0) ends up here
-			this->seq.push_back(0);
-		} else {
-			this->seq.swap(*vp);
-			delete vp;
-		}
+		setflag(get_default_flags());
+		this->seq.swap(*vp);
 	}
 
 	container(exvector::const_iterator b, exvector::const_iterator e)
-	 : inherited(get_tinfo()), container_storage<C>(b, e) {}
+	 : container_storage<C>(b, e)
+	{
+		setflag(get_default_flags());
+	}
 
 	explicit container(const ex & p1)
-	 : inherited(get_tinfo()), container_storage<C>(1, p1) {}
+	 : container_storage<C>(1, p1)
+	{
+		setflag(get_default_flags());
+	}
 
-	container(const ex & p1, const ex & p2) : inherited(get_tinfo())
+	container(const ex & p1, const ex & p2)
 	{
+		setflag(get_default_flags());
 		reserve(this->seq, 2);
 		this->seq.push_back(p1); this->seq.push_back(p2);
 	}
 
-	container(const ex & p1, const ex & p2, const ex & p3) : inherited(get_tinfo())
+	container(const ex & p1, const ex & p2, const ex & p3)
 	{
+		setflag(get_default_flags());
 		reserve(this->seq, 3);
 		this->seq.push_back(p1); this->seq.push_back(p2); this->seq.push_back(p3);
 	}
 
 	container(const ex & p1, const ex & p2, const ex & p3,
-	                   const ex & p4) : inherited(get_tinfo())
+	          const ex & p4)
 	{
+		setflag(get_default_flags());
 		reserve(this->seq, 4);
 		this->seq.push_back(p1); this->seq.push_back(p2); this->seq.push_back(p3);
 		this->seq.push_back(p4);
 	}
 
 	container(const ex & p1, const ex & p2, const ex & p3,
-	          const ex & p4, const ex & p5) : inherited(get_tinfo())
+	          const ex & p4, const ex & p5)
 	{
+		setflag(get_default_flags());
 		reserve(this->seq, 5);
 		this->seq.push_back(p1); this->seq.push_back(p2); this->seq.push_back(p3);
 		this->seq.push_back(p4); this->seq.push_back(p5);
 	}
 
 	container(const ex & p1, const ex & p2, const ex & p3,
-	          const ex & p4, const ex & p5, const ex & p6) : inherited(get_tinfo())
+	          const ex & p4, const ex & p5, const ex & p6)
 	{
+		setflag(get_default_flags());
 		reserve(this->seq, 6);
 		this->seq.push_back(p1); this->seq.push_back(p2); this->seq.push_back(p3);
 		this->seq.push_back(p4); this->seq.push_back(p5); this->seq.push_back(p6);
@@ -148,8 +213,9 @@ public:
 
 	container(const ex & p1, const ex & p2, const ex & p3,
 	          const ex & p4, const ex & p5, const ex & p6,
-	          const ex & p7) : inherited(get_tinfo())
+	          const ex & p7)
 	{
+		setflag(get_default_flags());
 		reserve(this->seq, 7);
 		this->seq.push_back(p1); this->seq.push_back(p2); this->seq.push_back(p3);
 		this->seq.push_back(p4); this->seq.push_back(p5); this->seq.push_back(p6);
@@ -158,8 +224,9 @@ public:
 
 	container(const ex & p1, const ex & p2, const ex & p3,
 	          const ex & p4, const ex & p5, const ex & p6,
-	          const ex & p7, const ex & p8) : inherited(get_tinfo())
+	          const ex & p7, const ex & p8)
 	{
+		setflag(get_default_flags());
 		reserve(this->seq, 8);
 		this->seq.push_back(p1); this->seq.push_back(p2); this->seq.push_back(p3);
 		this->seq.push_back(p4); this->seq.push_back(p5); this->seq.push_back(p6);
@@ -168,8 +235,9 @@ public:
 
 	container(const ex & p1, const ex & p2, const ex & p3,
 	          const ex & p4, const ex & p5, const ex & p6,
-	          const ex & p7, const ex & p8, const ex & p9) : inherited(get_tinfo())
+	          const ex & p7, const ex & p8, const ex & p9)
 	{
+		setflag(get_default_flags());
 		reserve(this->seq, 9);
 		this->seq.push_back(p1); this->seq.push_back(p2); this->seq.push_back(p3);
 		this->seq.push_back(p4); this->seq.push_back(p5); this->seq.push_back(p6);
@@ -179,8 +247,9 @@ public:
 	container(const ex & p1, const ex & p2, const ex & p3,
 	          const ex & p4, const ex & p5, const ex & p6,
 	          const ex & p7, const ex & p8, const ex & p9,
-	          const ex & p10) : inherited(get_tinfo())
+	          const ex & p10)
 	{
+		setflag(get_default_flags());
 		reserve(this->seq, 10);
 		this->seq.push_back(p1); this->seq.push_back(p2); this->seq.push_back(p3);
 		this->seq.push_back(p4); this->seq.push_back(p5); this->seq.push_back(p6);
@@ -191,8 +260,9 @@ public:
 	container(const ex & p1, const ex & p2, const ex & p3,
 	          const ex & p4, const ex & p5, const ex & p6,
 	          const ex & p7, const ex & p8, const ex & p9,
-	          const ex & p10, const ex & p11) : inherited(get_tinfo())
+	          const ex & p10, const ex & p11)
 	{
+		setflag(get_default_flags());
 		reserve(this->seq, 11);
 		this->seq.push_back(p1); this->seq.push_back(p2); this->seq.push_back(p3);
 		this->seq.push_back(p4); this->seq.push_back(p5); this->seq.push_back(p6);
@@ -203,8 +273,9 @@ public:
 	container(const ex & p1, const ex & p2, const ex & p3,
 	          const ex & p4, const ex & p5, const ex & p6,
 	          const ex & p7, const ex & p8, const ex & p9,
-	          const ex & p10, const ex & p11, const ex & p12) : inherited(get_tinfo())
+	          const ex & p10, const ex & p11, const ex & p12)
 	{
+		setflag(get_default_flags());
 		reserve(this->seq, 12);
 		this->seq.push_back(p1); this->seq.push_back(p2); this->seq.push_back(p3);
 		this->seq.push_back(p4); this->seq.push_back(p5); this->seq.push_back(p6);
@@ -216,8 +287,9 @@ public:
 	          const ex & p4, const ex & p5, const ex & p6,
 	          const ex & p7, const ex & p8, const ex & p9,
 	          const ex & p10, const ex & p11, const ex & p12,
-	          const ex & p13) : inherited(get_tinfo())
+	          const ex & p13)
 	{
+		setflag(get_default_flags());
 		reserve(this->seq, 13);
 		this->seq.push_back(p1); this->seq.push_back(p2); this->seq.push_back(p3);
 		this->seq.push_back(p4); this->seq.push_back(p5); this->seq.push_back(p6);
@@ -230,8 +302,9 @@ public:
 	          const ex & p4, const ex & p5, const ex & p6,
 	          const ex & p7, const ex & p8, const ex & p9,
 	          const ex & p10, const ex & p11, const ex & p12,
-	          const ex & p13, const ex & p14) : inherited(get_tinfo())
+	          const ex & p13, const ex & p14)
 	{
+		setflag(get_default_flags());
 		reserve(this->seq, 14);
 		this->seq.push_back(p1); this->seq.push_back(p2); this->seq.push_back(p3);
 		this->seq.push_back(p4); this->seq.push_back(p5); this->seq.push_back(p6);
@@ -244,8 +317,9 @@ public:
 	          const ex & p4, const ex & p5, const ex & p6,
 	          const ex & p7, const ex & p8, const ex & p9,
 	          const ex & p10, const ex & p11, const ex & p12,
-	          const ex & p13, const ex & p14, const ex & p15) : inherited(get_tinfo())
+	          const ex & p13, const ex & p14, const ex & p15)
 	{
+		setflag(get_default_flags());
 		reserve(this->seq, 15);
 		this->seq.push_back(p1); this->seq.push_back(p2); this->seq.push_back(p3);
 		this->seq.push_back(p4); this->seq.push_back(p5); this->seq.push_back(p6);
@@ -259,8 +333,9 @@ public:
 	          const ex & p7, const ex & p8, const ex & p9,
 	          const ex & p10, const ex & p11, const ex & p12,
 	          const ex & p13, const ex & p14, const ex & p15,
-	          const ex & p16) : inherited(get_tinfo())
+	          const ex & p16)
 	{
+		setflag(get_default_flags());
 		reserve(this->seq, 16);
 		this->seq.push_back(p1); this->seq.push_back(p2); this->seq.push_back(p3);
 		this->seq.push_back(p4); this->seq.push_back(p5); this->seq.push_back(p6);
@@ -270,6 +345,15 @@ public:
 		this->seq.push_back(p16);
 	}
 
+	// First step of initialization of container with a comma-separated
+	// sequence of expressions. Subsequent steps are handled by
+	// container_init<>::operator,().
+	container_init<ex, STLT> operator=(const ex & x)
+	{
+		this->seq.push_back(x);
+		return container_init<ex, STLT>(this->seq);
+	}
+
 	// functions overriding virtual functions from base classes
 public:
 	bool info(unsigned inf) const { return inherited::info(inf); }
@@ -280,7 +364,83 @@ public:
 	ex eval(int level = 0) const;
 	ex subs(const exmap & m, unsigned options = 0) const;
 
+	void read_archive(const archive_node &n, lst &sym_lst) 
+	{
+		inherited::read_archive(n, sym_lst);
+		setflag(get_default_flags());
+
+		archive_node::archive_node_cit first = n.find_first("seq");
+		archive_node::archive_node_cit last = n.find_last("seq");
+		++last;
+		reserve(this->seq, last - first);
+		for (archive_node::archive_node_cit i=first; i<last; ++i) {
+			ex e;
+			n.find_ex_by_loc(i, e, sym_lst);
+			this->seq.push_back(e);
+		}
+	}
+
+	/** Archive the object. */
+	void archive(archive_node &n) const
+	{
+		inherited::archive(n);
+		const_iterator i = this->seq.begin(), end = this->seq.end();
+		while (i != end) {
+			n.add_ex("seq", *i);
+			++i;
+		}
+	}
+
 protected:
+	ex conjugate() const
+	{
+		STLT *newcont = NULL;
+		for (const_iterator i=this->seq.begin(); i!=this->seq.end(); ++i) {
+			if (newcont) {
+				newcont->push_back(i->conjugate());
+				continue;
+			}
+			ex x = i->conjugate();
+			if (are_ex_trivially_equal(x, *i)) {
+				continue;
+			}
+			newcont = new STLT;
+			reserve(*newcont, this->seq.size());
+			for (const_iterator j=this->seq.begin(); j!=i; ++j) {
+				newcont->push_back(*j);
+			}
+			newcont->push_back(x);
+		}
+		if (newcont) {
+			ex result = thiscontainer(*newcont);
+			delete newcont;
+			return result;
+		}
+		return *this;
+	}
+
+	ex real_part() const
+	{
+		STLT cont;
+		reserve(cont, nops());
+		const_iterator b = begin();
+		const_iterator e = end();
+		for(const_iterator i=b; i!=e; ++i)
+			cont.push_back(i->real_part());
+		return thiscontainer(cont);
+	}
+
+	ex imag_part() const
+	{
+		STLT cont;
+		reserve(cont, nops());
+		const_iterator b = begin();
+		const_iterator e = end();
+		for(const_iterator i=b; i!=e; ++i)
+			cont.push_back(i->imag_part());
+		return thiscontainer(cont);
+	}
+
 	bool is_equal_same_type(const basic & other) const;
 
 	// new virtual functions which can be overridden by derived classes
@@ -291,7 +451,7 @@ protected:
 
 	/** Similar to duplicate(), but with a preset sequence (which gets
 	 *  deleted). Must be overridden by derived classes. */
-	virtual ex thiscontainer(STLT * vp) const { return container(vp); }
+	virtual ex thiscontainer(std::auto_ptr<STLT> vp) const { return container(vp); }
 
 	virtual void printseq(const print_context & c, char openbracket, char delim,
 	                      char closebracket, unsigned this_precedence,
@@ -335,56 +495,28 @@ protected:
 	void do_print_python(const print_python & c, unsigned level) const;
 	void do_print_python_repr(const print_python_repr & c, unsigned level) const;
 	STLT evalchildren(int level) const;
-	STLT *subschildren(const exmap & m, unsigned options = 0) const;
+	std::auto_ptr<STLT> subschildren(const exmap & m, unsigned options = 0) const;
 };
 
 /** Default constructor */
-template <template <class> class C>
-container<C>::container() : inherited(get_tinfo()) {}
-
-/** Construct object from archive_node. */
-template <template <class> class C>
-container<C>::container(const archive_node &n, lst &sym_lst) : inherited(n, sym_lst)
+template <template <class T, class = std::allocator<T> > class C>
+container<C>::container()
 {
-	for (unsigned int i=0; true; i++) {
-		ex e;
-		if (n.find_ex("seq", e, sym_lst, i))
-			this->seq.push_back(e);
-		else
-			break;
-	}
+	setflag(get_default_flags());
 }
 
-/** Unarchive the object. */
-template <template <class> class C>
-ex container<C>::unarchive(const archive_node &n, lst &sym_lst)
-{
-	return (new container(n, sym_lst))->setflag(status_flags::dynallocated);
-}
-
-/** Archive the object. */
-template <template <class> class C>
-void container<C>::archive(archive_node &n) const
-{
-	inherited::archive(n);
-	const_iterator i = this->seq.begin(), end = this->seq.end();
-	while (i != end) {
-		n.add_ex("seq", *i);
-		++i;
-	}
-}
 
-template <template <class> class C>
+template <template <class T, class = std::allocator<T> > class C>
 void container<C>::do_print(const print_context & c, unsigned level) const
 {
 	// always print brackets around seq, ignore upper_precedence
 	printseq(c, get_open_delim(), ',', get_close_delim(), precedence(), precedence()+1);
 }
 
-template <template <class> class C>
+template <template <class T, class = std::allocator<T> > class C>
 void container<C>::do_print_tree(const print_tree & c, unsigned level) const
 {
-	c.s << std::string(level, ' ') << class_name()
+	c.s << std::string(level, ' ') << class_name() << " @" << this
 	    << std::hex << ", hash=0x" << hashvalue << ", flags=0x" << flags << std::dec
 	    << ", nops=" << nops()
 	    << std::endl;
@@ -396,20 +528,20 @@ void container<C>::do_print_tree(const print_tree & c, unsigned level) const
 	c.s << std::string(level + c.delta_indent,' ') << "=====" << std::endl;
 }
 
-template <template <class> class C>
+template <template <class T, class = std::allocator<T> > class C>
 void container<C>::do_print_python(const print_python & c, unsigned level) const
 {
 	printseq(c, '[', ',', ']', precedence(), precedence()+1);
 }
 
-template <template <class> class C>
+template <template <class T, class = std::allocator<T> > class C>
 void container<C>::do_print_python_repr(const print_python_repr & c, unsigned level) const
 {
 	c.s << class_name();
 	printseq(c, '(', ',', ')', precedence(), precedence()+1);
 }
 
-template <template <class> class C>
+template <template <class T, class = std::allocator<T> > class C>
 ex container<C>::op(size_t i) const
 {
 	GINAC_ASSERT(i < nops());
@@ -419,7 +551,7 @@ ex container<C>::op(size_t i) const
 	return *it;
 }
 
-template <template <class> class C>
+template <template <class T, class = std::allocator<T> > class C>
 ex & container<C>::let_op(size_t i)
 {
 	GINAC_ASSERT(i < nops());
@@ -430,7 +562,7 @@ ex & container<C>::let_op(size_t i)
 	return *it;
 }
 
-template <template <class> class C>
+template <template <class T, class = std::allocator<T> > class C>
 ex container<C>::eval(int level) const
 {
 	if (level == 1)
@@ -439,18 +571,18 @@ ex container<C>::eval(int level) const
 		return thiscontainer(evalchildren(level));
 }
 
-template <template <class> class C>
+template <template <class T, class = std::allocator<T> > class C>
 ex container<C>::subs(const exmap & m, unsigned options) const
 {
-	STLT *vp = subschildren(m, options);
-	if (vp)
+	std::auto_ptr<STLT> vp = subschildren(m, options);
+	if (vp.get())
 		return ex_to<basic>(thiscontainer(vp)).subs_one_level(m, options);
 	else
 		return subs_one_level(m, options);
 }
 
 /** Compare two containers of the same type. */
-template <template <class> class C>
+template <template <class T, class = std::allocator<T> > class C>
 int container<C>::compare_same_type(const basic & other) const
 {
 	GINAC_ASSERT(is_a<container>(other));
@@ -469,7 +601,7 @@ int container<C>::compare_same_type(const basic & other) const
 	return (it1 == it1end) ? (it2 == it2end ? 0 : -1) : 1;
 }
 
-template <template <class> class C>
+template <template <class T, class = std::allocator<T> > class C>
 bool container<C>::is_equal_same_type(const basic & other) const
 {
 	GINAC_ASSERT(is_a<container>(other));
@@ -489,7 +621,7 @@ bool container<C>::is_equal_same_type(const basic & other) const
 }
 
 /** Add element at front. */
-template <template <class> class C>
+template <template <class T, class = std::allocator<T> > class C>
 container<C> & container<C>::prepend(const ex & b)
 {
 	ensure_if_modifiable();
@@ -498,7 +630,7 @@ container<C> & container<C>::prepend(const ex & b)
 }
 
 /** Add element at back. */
-template <template <class> class C>
+template <template <class T, class = std::allocator<T> > class C>
 container<C> & container<C>::append(const ex & b)
 {
 	ensure_if_modifiable();
@@ -507,7 +639,7 @@ container<C> & container<C>::append(const ex & b)
 }
 
 /** Remove first element. */
-template <template <class> class C>
+template <template <class T, class = std::allocator<T> > class C>
 container<C> & container<C>::remove_first()
 {
 	ensure_if_modifiable();
@@ -516,7 +648,7 @@ container<C> & container<C>::remove_first()
 }
 
 /** Remove last element. */
-template <template <class> class C>
+template <template <class T, class = std::allocator<T> > class C>
 container<C> & container<C>::remove_last()
 {
 	ensure_if_modifiable();
@@ -525,7 +657,7 @@ container<C> & container<C>::remove_last()
 }
 
 /** Remove all elements. */
-template <template <class> class C>
+template <template <class T, class = std::allocator<T> > class C>
 container<C> & container<C>::remove_all()
 {
 	ensure_if_modifiable();
@@ -534,7 +666,7 @@ container<C> & container<C>::remove_all()
 }
 
 /** Sort elements. */
-template <template <class> class C>
+template <template <class T, class = std::allocator<T> > class C>
 container<C> & container<C>::sort()
 {
 	ensure_if_modifiable();
@@ -543,13 +675,13 @@ container<C> & container<C>::sort()
 }
 
 /** Specialization of container::unique_() for std::list. */
-inline void container<std::list>::unique_()
+template<> inline void container<std::list>::unique_()
 {
 	this->seq.unique(ex_is_equal());
 }
 
 /** Remove adjacent duplicate elements. */
-template <template <class> class C>
+template <template <class T, class = std::allocator<T> > class C>
 container<C> & container<C>::unique()
 {
 	ensure_if_modifiable();
@@ -558,7 +690,7 @@ container<C> & container<C>::unique()
 }
 
 /** Print sequence of contained elements. */
-template <template <class> class C>
+template <template <class T, class = std::allocator<T> > class C>
 void container<C>::printseq(const print_context & c, char openbracket, char delim,
                             char closebracket, unsigned this_precedence,
                             unsigned upper_precedence) const
@@ -581,7 +713,7 @@ void container<C>::printseq(const print_context & c, char openbracket, char deli
 		c.s << closebracket;
 }
 
-template <template <class> class C>
+template <template <class T, class = std::allocator<T> > class C>
 typename container<C>::STLT container<C>::evalchildren(int level) const
 {
 	if (level == 1)
@@ -602,12 +734,12 @@ typename container<C>::STLT container<C>::evalchildren(int level) const
 	return s;
 }
 
-template <template <class> class C>
-typename container<C>::STLT *container<C>::subschildren(const exmap & m, unsigned options) const
+template <template <class T, class = std::allocator<T> > class C>
+std::auto_ptr<typename container<C>::STLT> container<C>::subschildren(const exmap & m, unsigned options) const
 {
 	// returns a NULL pointer if nothing had to be substituted
-	// returns a pointer to a newly created epvector otherwise
-	// (which has to be deleted somewhere else)
+	// returns a pointer to a newly created STLT otherwise
+	// (and relinquishes responsibility for the STLT)
 
 	const_iterator cit = this->seq.begin(), end = this->seq.end();
 	while (cit != end) {
@@ -615,7 +747,7 @@ typename container<C>::STLT *container<C>::subschildren(const exmap & m, unsigne
 		if (!are_ex_trivially_equal(*cit, subsed_ex)) {
 
 			// copy first part of seq which hasn't changed
-			STLT *s = new STLT(this->seq.begin(), cit);
+			std::auto_ptr<STLT> s(new STLT(this->seq.begin(), cit));
 			reserve(*s, this->seq.size());
 
 			// insert changed element
@@ -634,9 +766,9 @@ typename container<C>::STLT *container<C>::subschildren(const exmap & m, unsigne
 		++cit;
 	}
 	
-	return 0; // nothing has changed
+	return std::auto_ptr<STLT>(0); // nothing has changed
 }
 
 } // namespace GiNaC
 
-#endif // ndef __GINAC_CONTAINER_H__
+#endif // ndef GINAC_CONTAINER_H