1 files changed, 137 insertions, 0 deletions
diff --git a/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.alg/swap.pass.cpp b/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.alg/swap.pass.cpp
new file mode 100644
index 00000000000..b8995bffe0f
--- /dev/null
+++ b/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.alg/swap.pass.cpp
@@ -0,0 +1,137 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <functional>
+
+// class function<R(ArgTypes...)>
+
+// template <MoveConstructible  R, MoveConstructible ... ArgTypes>
+//   void swap(function<R(ArgTypes...)>&, function<R(ArgTypes...)>&);
+
+// UNSUPPORTED: asan, msan
+
+#include <functional>
+#include <new>
+#include <cstdlib>
+#include <cassert>
+
+int new_called = 0;
+
+void* operator new(std::size_t s) throw(std::bad_alloc)
+{
+    ++new_called;
+    return std::malloc(s);
+}
+
+void  operator delete(void* p) throw()
+{
+    --new_called;
+    std::free(p);
+}
+
+class A
+{
+    int data_[10];
+public:
+    static int count;
+
+    explicit A(int j)
+    {
+        ++count;
+        data_[0] = j;
+    }
+
+    A(const A& a)
+    {
+        ++count;
+        for (int i = 0; i < 10; ++i)
+            data_[i] = a.data_[i];
+    }
+
+    ~A() {--count;}
+
+    int operator()(int i) const
+    {
+        for (int j = 0; j < 10; ++j)
+            i += data_[j];
+        return i;
+    }
+
+    int id() const {return data_[0];}
+};
+
+int A::count = 0;
+
+int g(int) {return 0;}
+int h(int) {return 1;}
+
+int main()
+{
+    assert(new_called == 0);
+    {
+    std::function<int(int)> f1 = A(1);
+    std::function<int(int)> f2 = A(2);
+    assert(A::count == 2);
+    assert(new_called == 2);
+    assert(f1.target<A>()->id() == 1);
+    assert(f2.target<A>()->id() == 2);
+    swap(f1, f2);
+    assert(A::count == 2);
+    assert(new_called == 2);
+    assert(f1.target<A>()->id() == 2);
+    assert(f2.target<A>()->id() == 1);
+    }
+    assert(A::count == 0);
+    assert(new_called == 0);
+    {
+    std::function<int(int)> f1 = A(1);
+    std::function<int(int)> f2 = g;
+    assert(A::count == 1);
+    assert(new_called == 1);
+    assert(f1.target<A>()->id() == 1);
+    assert(*f2.target<int(*)(int)>() == g);
+    swap(f1, f2);
+    assert(A::count == 1);
+    assert(new_called == 1);
+    assert(*f1.target<int(*)(int)>() == g);
+    assert(f2.target<A>()->id() == 1);
+    }
+    assert(A::count == 0);
+    assert(new_called == 0);
+    {
+    std::function<int(int)> f1 = g;
+    std::function<int(int)> f2 = A(1);
+    assert(A::count == 1);
+    assert(new_called == 1);
+    assert(*f1.target<int(*)(int)>() == g);
+    assert(f2.target<A>()->id() == 1);
+    swap(f1, f2);
+    assert(A::count == 1);
+    assert(new_called == 1);
+    assert(f1.target<A>()->id() == 1);
+    assert(*f2.target<int(*)(int)>() == g);
+    }
+    assert(A::count == 0);
+    assert(new_called == 0);
+    {
+    std::function<int(int)> f1 = g;
+    std::function<int(int)> f2 = h;
+    assert(A::count == 0);
+    assert(new_called == 0);
+    assert(*f1.target<int(*)(int)>() == g);
+    assert(*f2.target<int(*)(int)>() == h);
+    swap(f1, f2);
+    assert(A::count == 0);
+    assert(new_called == 0);
+    assert(*f1.target<int(*)(int)>() == h);
+    assert(*f2.target<int(*)(int)>() == g);
+    }
+    assert(A::count == 0);
+    assert(new_called == 0);
+}