From 98fa99a4c097b9baee1ce09124a24bced4b1abbb Mon Sep 17 00:00:00 2001
From: Chris Dams <Chris.Dams@mi.infn.it>
Date: Thu, 17 Aug 2006 14:38:38 +0000
Subject: [PATCH 1/1] Support for exset and printing thereof.

---
 ginac/basic.h       |  2 ++
 ginac/ex.h          |  1 +
 ginac/operators.cpp | 27 +++++++++++++++++++++++++++
 3 files changed, 30 insertions(+)

diff --git a/ginac/basic.h b/ginac/basic.h
index b08ad669..5fa74d5b 100644
--- a/ginac/basic.h
+++ b/ginac/basic.h
@@ -25,6 +25,7 @@
 
 #include <cstddef> // for size_t
 #include <vector>
+#include <set>
 #include <map>
 // CINT needs <algorithm> to work properly with <vector>
 #include <algorithm>
@@ -45,6 +46,7 @@ class archive_node;
 class print_context;
 
 typedef std::vector<ex> exvector;
+typedef std::set<ex, ex_is_less> exset;
 typedef std::map<ex, ex, ex_is_less> exmap;
 
 // Define this to enable some statistical output for comparisons and hashing
diff --git a/ginac/ex.h b/ginac/ex.h
index 574e6800..3070b7ad 100644
--- a/ginac/ex.h
+++ b/ginac/ex.h
@@ -687,6 +687,7 @@ struct ex_swap : public std::binary_function<ex, ex, void> {
 
 // Make it possible to print exvectors and exmaps
 std::ostream & operator<<(std::ostream & os, const exvector & e);
+std::ostream & operator<<(std::ostream & os, const exset & e);
 std::ostream & operator<<(std::ostream & os, const exmap & e);
 
 // wrapper functions around member functions
diff --git a/ginac/operators.cpp b/ginac/operators.cpp
index 1a1b6de4..d7549659 100644
--- a/ginac/operators.cpp
+++ b/ginac/operators.cpp
@@ -377,6 +377,33 @@ std::ostream & operator<<(std::ostream & os, const exvector & e)
 	return os;
 }
 
+std::ostream & operator<<(std::ostream & os, const exset & e)
+{
+	print_context *p = get_print_context(os);
+	exset::const_iterator i = e.begin();
+	exset::const_iterator send = e.end();
+
+	if (i==send) {
+		os << "<>";
+		return os;
+	}
+
+	os << "<";
+	while (true) {
+		if (p == 0)
+			i->print(print_dflt(os));
+		else
+			i->print(*p);
+		++i;
+		if (i == send)
+			break;
+		os << ",";
+	}
+	os << ">";
+
+	return os;
+}
+
 std::ostream & operator<<(std::ostream & os, const exmap & e)
 {
 	print_context *p = get_print_context(os);
-- 
2.44.0