From 787cd1101e4bc1446206f6e345d023ca18ded09a Mon Sep 17 00:00:00 2001
From: jzmaddock <john@johnmaddock.co.uk>
Date: Sun, 22 Dec 2013 09:57:01 +0000
Subject: [PATCH] Update tests to exercise move-construct/copy better. Fix
 exposed bug in tommath backend. See also
 https://svn.boost.org/trac/boost/ticket/9497.

---
 include/boost/multiprecision/tommath.hpp |  2 +-
 test/test_arithmetic.hpp                 | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/include/boost/multiprecision/tommath.hpp b/include/boost/multiprecision/tommath.hpp
index 17094434..85a7551e 100644
--- a/include/boost/multiprecision/tommath.hpp
+++ b/include/boost/multiprecision/tommath.hpp
@@ -58,7 +58,7 @@ struct tommath_int
    }
    tommath_int& operator = (tommath_int&& o)
    {
-      mp_exch(&m_data, &o.data());
+      mp_exch(&m_data, &o.m_data);
       return *this;
    }
 #endif
diff --git a/test/test_arithmetic.hpp b/test/test_arithmetic.hpp
index a34d6247..3b6703ff 100644
--- a/test/test_arithmetic.hpp
+++ b/test/test_arithmetic.hpp
@@ -1777,5 +1777,24 @@ void test()
    test_conditional(a, (a + 0));
 
    test_signed_ops<Real>(boost::mpl::bool_<std::numeric_limits<Real>::is_signed>());
+   //
+   // Test move:
+   //
+#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
+   Real m(static_cast<Real&&>(a));
+   BOOST_CHECK_EQUAL(m, 20);
+   // Move from already moved from object:
+   Real m2(static_cast<Real&&>(a));
+   // assign from moved from object 
+   // (may result in "a" being left in valid state as implementation artifact):
+   c = static_cast<Real&&>(a);
+   // assignment to moved-from objects:
+   c = static_cast<Real&&>(m);
+   BOOST_CHECK_EQUAL(c, 20);
+   m2 = c;
+   BOOST_CHECK_EQUAL(c, 20);
+   // Destructor of "a" checks destruction of moved-from-object...
+   Real m3(static_cast<Real&&>(a));
+#endif
 }