From a5d9a95994952061aaab5670d6f49c1214b5cd04 Mon Sep 17 00:00:00 2001
From: minmingong <minmingong@global.tencent.com>
Date: Fri, 20 Dec 2024 12:40:08 -0800
Subject: [PATCH] Remove the `using namespace` from headers to eliminate the
 namespace contamination

---
 include/implicit_point.h   | 5 +++--
 include/implicit_point.hpp | 2 +-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/include/implicit_point.h b/include/implicit_point.h
index 3edbf99..9e606c8 100644
--- a/include/implicit_point.h
+++ b/include/implicit_point.h
@@ -442,8 +442,8 @@ class implicitPoint3D_LNC : public genericPoint {
 //
 //////////////////////////////////////////////////////////////////////////////////////
 
-using namespace ::std;
-
+namespace std
+{
 ostream& operator<<(ostream& os, const genericPoint& p);
 
 inline ostream& operator<<(ostream& os, const explicitPoint2D& p)
@@ -483,6 +483,7 @@ inline ostream& operator<<(ostream& os, const implicitPoint3D_LNC& p)
 	if (p.apapExplicit(e)) return os << e;
 	else return os << "UNDEF_LNC";
 }
+}
 
 #include "hand_optimized_predicates.hpp"
 #include "implicit_point.hpp"
diff --git a/include/implicit_point.hpp b/include/implicit_point.hpp
index 6cc36cf..3dc5718 100644
--- a/include/implicit_point.hpp
+++ b/include/implicit_point.hpp
@@ -935,7 +935,7 @@ inline bool implicitPoint3D_LNC::getExactXYZCoordinates(bigrational& x, bigratio
 	return true;
 }
 
-inline ostream& operator<<(ostream& os, const genericPoint& p)
+inline std::ostream& operator<<(std::ostream& os, const genericPoint& p)
 {
 	if (p.isExplicit2D()) return os << p.toExplicit2D();
 	else if (p.isExplicit3D()) return os << p.toExplicit3D();