From b4940574c06ea2a61ee3097dc145302d4a48911e Mon Sep 17 00:00:00 2001
From: Alex Dyachenko <alexd60@hotmail.com>
Date: Mon, 24 Mar 2014 00:04:35 -0400
Subject: [PATCH] Swap. Completed MPIR 2.6.0 section 5.2, except setting MPZ
 from MPQ or MPF

---
 .../mpir.net-tests/HugeIntTests/Assignment.cs      | 14 ++++++++++++++
 build.vc11/mpir.net/mpir.net/HugeInt.h             |  3 +++
 2 files changed, 17 insertions(+)

diff --git a/build.vc11/mpir.net/mpir.net-tests/HugeIntTests/Assignment.cs b/build.vc11/mpir.net/mpir.net-tests/HugeIntTests/Assignment.cs
index 0b882b87..b1b38358 100644
--- a/build.vc11/mpir.net/mpir.net-tests/HugeIntTests/Assignment.cs
+++ b/build.vc11/mpir.net/mpir.net-tests/HugeIntTests/Assignment.cs
@@ -35,6 +35,20 @@ namespace MPIR.Tests.HugeIntTests
                 Assert.AreEqual("-222509832503450298345029835740293845720", b.ToString());
             }
         }
+
+        [TestMethod]
+        public void Swap()
+        {
+            using (var a = new HugeInt("-222509832503450298345029835740293845720"))
+            using (var b = new HugeInt("2039847290878794872059384789347534534"))
+            {
+                var aValue = a._value();
+                var bValue = b._value();
+                a.Swap(b);
+                Assert.AreEqual(bValue, a._value());
+                Assert.AreEqual(aValue, b._value());
+            }
+        }
         //more tests coming here
     }
 }
diff --git a/build.vc11/mpir.net/mpir.net/HugeInt.h b/build.vc11/mpir.net/mpir.net/HugeInt.h
index 0edea396..601e807d 100644
--- a/build.vc11/mpir.net/mpir.net/HugeInt.h
+++ b/build.vc11/mpir.net/mpir.net/HugeInt.h
@@ -367,5 +367,8 @@ namespace MPIR
             void SetTo(double value) { mpz_set_d(_value, value); }
             void SetTo(String^ value) { SetTo(value, 10); }
             void SetTo(String^ value, int base);
+
+            //utility methods
+            void Swap(HugeInt^ a) { mpz_ptr temp = a->_value; a->_value = _value; _value = temp; }
     };
 };
\ No newline at end of file