Fix C++ example namespace

--HG--
extra : transplant_source : %CF%81%20%8A%8D%5B%D8%84%7FE%FFu%88%C5%BF%13.%A3%DD%BE

docs/src/userguide/wrapping_CPlusPlus.rst

@@ -75,41 +75,36 @@ and the implementation in the file called :file:`Rectangle.cpp`:
 
     #include "Rectangle.h"
 
-    using namespace shapes;
-
-    Rectangle::Rectangle(int X0, int Y0, int X1, int Y1)
-    {
-        x0 = X0;
-        y0 = Y0;
-        x1 = X1;
-        y1 = Y1;
-    }
-
-    Rectangle::~Rectangle()
-    {
-    }
-
-    int Rectangle::getLength()
-    {
-        return (x1 - x0);
-    }
-
-    int Rectangle::getHeight()
-    {
-        return (y1 - y0);
-    }
-
-    int Rectangle::getArea()
-    {
-        return (x1 - x0) * (y1 - y0);
-    }
+    namespace shapes {
 
-    void Rectangle::move(int dx, int dy)
-    {
-        x0 += dx;
-        y0 += dy;
-        x1 += dx;
-        y1 += dy;
+        Rectangle::Rectangle(int X0, int Y0, int X1, int Y1) {
+            x0 = X0;
+            y0 = Y0;
+            x1 = X1;
+            y1 = Y1;
+        }
+
+        Rectangle::~Rectangle() { }
+
+        int Rectangle::getLength() {
+            return (x1 - x0);
+        }
+
+        int Rectangle::getHeight() {
+            return (y1 - y0);
+        }
+
+        int Rectangle::getArea() {
+            return (x1 - x0) * (y1 - y0);
+        }
+
+        void Rectangle::move(int dx, int dy) {
+            x0 += dx;
+            y0 += dy;
+            x1 += dx;
+            y1 += dy;
+        }
+  
     }
 
 This is pretty dumb, but should suffice to demonstrate the steps involved.