PR libstdc++/81017 add noexcept to std::function move operations

	PR libstdc++/81017
	* include/bits/std_function.h (function::function(function&&))
	(function::operator=(funtion&&)): Add noexcept.
	* testsuite/20_util/function/assign/move.cc: Check for noexcept.
	* testsuite/20_util/function/cons/move.cc: Likewise.

From-SVN: r249018

libstdc++-v3/ChangeLog

+2017-06-08  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR libstdc++/81017
+	* include/bits/std_function.h (function::function(function&&))
+	(function::operator=(funtion&&)): Add noexcept.
+	* testsuite/20_util/function/assign/move.cc: Check for noexcept.
+	* testsuite/20_util/function/cons/move.cc: Likewise.
+
 2017-06-07  Jonathan Wakely  <jwakely@redhat.com>
 
 	* include/bits/regex.h (basic_regex): Add deduction guide from P0433.

libstdc++-v3/include/bits/std_function.h

@@ -438,7 +438,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
        *  The newly-created %function contains the target of @a __x
        *  (if it has one).
        */
-      function(function&& __x) : _Function_base()
+      function(function&& __x) noexcept : _Function_base()
       {
 	__x.swap(*this);
       }
@@ -495,7 +495,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
        *  object, then this operation will not throw an %exception.
        */
       function&
-      operator=(function&& __x)
+      operator=(function&& __x) noexcept
       {
 	function(std::move(__x)).swap(*this);
 	return *this;

libstdc++-v3/testsuite/20_util/function/assign/move.cc

@@ -38,11 +38,12 @@ void test01()
   fo2 = (std::move(fo));
   VERIFY( static_cast<bool>(fo2) );
   VERIFY( fo2() == 2 );
+
+  static_assert(std::is_nothrow_move_assignable<function>::value,
+		"PR libstdc++/81017");
 }
 
 int main()
 {
   test01();
-
-  return 0;
 }

libstdc++-v3/testsuite/20_util/function/cons/move.cc

@@ -36,11 +36,12 @@ void test01()
   function fo2(std::move(fo));
   VERIFY( static_cast<bool>(fo2) );
   VERIFY( fo2() == 2 );
+
+  static_assert(std::is_nothrow_move_constructible<function>::value,
+		"PR libstdc++/81017");
 }
 
 int main()
 {
   test01();
-
-  return 0;
 }