From e9115a1b416a659a5265e94b866617c44ba4eecb Mon Sep 17 00:00:00 2001
From: Marshall Clow <mclow.lists@gmail.com>
Date: Mon, 10 Oct 2016 16:47:48 +0000
Subject: [PATCH] Add tests to check that swap(std::function, std::function) is
 noexcept. This is LWG#2062, but we already do this. No changes to the
 library, just adding tests.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@283780 91177308-0d34-0410-b5e6-96231b3b80d8
---
 .../func.wrap.func.alg/swap.pass.cpp              | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.alg/swap.pass.cpp b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.alg/swap.pass.cpp
index 58192c928..1a9206e0e 100644
--- a/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.alg/swap.pass.cpp
+++ b/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.alg/swap.pass.cpp
@@ -12,13 +12,14 @@
 // class function<R(ArgTypes...)>
 
 // template <MoveConstructible  R, MoveConstructible ... ArgTypes>
-//   void swap(function<R(ArgTypes...)>&, function<R(ArgTypes...)>&);
+//   void swap(function<R(ArgTypes...)>&, function<R(ArgTypes...)>&) noexcept;
 
 
 #include <functional>
 #include <cstdlib>
 #include <cassert>
 
+#include "test_macros.h"
 #include "count_new.hpp"
 
 class A
@@ -63,6 +64,9 @@ int main()
     {
     std::function<int(int)> f1 = A(1);
     std::function<int(int)> f2 = A(2);
+#if TEST_STD_VER >= 11
+    static_assert(noexcept(swap(f1, f2)), "" );
+#endif
     assert(A::count == 2);
     assert(globalMemCounter.checkOutstandingNewEq(2));
     assert(f1.target<A>()->id() == 1);
@@ -78,6 +82,9 @@ int main()
     {
     std::function<int(int)> f1 = A(1);
     std::function<int(int)> f2 = g;
+#if TEST_STD_VER >= 11
+    static_assert(noexcept(swap(f1, f2)), "" );
+#endif
     assert(A::count == 1);
     assert(globalMemCounter.checkOutstandingNewEq(1));
     assert(f1.target<A>()->id() == 1);
@@ -93,6 +100,9 @@ int main()
     {
     std::function<int(int)> f1 = g;
     std::function<int(int)> f2 = A(1);
+#if TEST_STD_VER >= 11
+    static_assert(noexcept(swap(f1, f2)), "" );
+#endif
     assert(A::count == 1);
     assert(globalMemCounter.checkOutstandingNewEq(1));
     assert(*f1.target<int(*)(int)>() == g);
@@ -108,6 +118,9 @@ int main()
     {
     std::function<int(int)> f1 = g;
     std::function<int(int)> f2 = h;
+#if TEST_STD_VER >= 11
+    static_assert(noexcept(swap(f1, f2)), "" );
+#endif
     assert(A::count == 0);
     assert(globalMemCounter.checkOutstandingNewEq(0));
     assert(*f1.target<int(*)(int)>() == g);