1 files changed, 94 insertions, 0 deletions
diff --git a/test/std/containers/container.adaptors/stack/stack.cons/deduct.pass.cpp b/test/std/containers/container.adaptors/stack/stack.cons/deduct.pass.cpp
new file mode 100644
index 000000000000..bb48f0e5e22e
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+++ b/test/std/containers/container.adaptors/stack/stack.cons/deduct.pass.cpp
@@ -0,0 +1,94 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <stack>
+// UNSUPPORTED: c++98, c++03, c++11, c++14
+// UNSUPPORTED: clang-5, apple-clang-9
+// UNSUPPORTED: libcpp-no-deduction-guides
+// Clang 5 will generate bad implicit deduction guides
+//	Specifically, for the copy constructor.
+
+
+// template<class Container>
+//   stack(Container) -> stack<typename Container::value_type, Container>;
+//
+// template<class Container, class Allocator>
+//   stack(Container, Allocator) -> stack<typename Container::value_type, Container>;
+
+
+#include <stack>
+#include <vector>
+#include <list>
+#include <iterator>
+#include <cassert>
+#include <cstddef>
+#include <climits> // INT_MAX
+
+#include "test_macros.h"
+#include "test_iterators.h"
+#include "test_allocator.h"
+
+struct A {};
+
+int main()
+{
+
+//  Test the explicit deduction guides
+    {
+    std::vector<int> v{0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+    std::stack stk(v);
+
+    static_assert(std::is_same_v<decltype(stk), std::stack<int, std::vector<int>>>, "");
+    assert(stk.size() == v.size());
+    assert(stk.top() == v.back());
+    }
+
+    {
+    std::list<long, test_allocator<long>> l{10, 11, 12, 13, 14, 15, 16, 17, 18, 19 };
+    std::stack stk(l, test_allocator<long>(0,2)); // different allocator
+    static_assert(std::is_same_v<decltype(stk)::container_type, std::list<long, test_allocator<long>>>, "");
+    static_assert(std::is_same_v<decltype(stk)::value_type, long>, "");
+    assert(stk.size() == 10);
+    assert(stk.top() == 19);
+//  I'd like to assert that we've gotten the right allocator in the stack, but
+//  I don't know how to get at the underlying container.
+    }
+
+//  Test the implicit deduction guides
+
+    {
+//  We don't expect this one to work - no way to implicitly get value_type
+//  std::stack stk(std::allocator<int>()); // stack (allocator &)
+    }
+
+    {
+    std::stack<A> source;
+    std::stack stk(source); // stack(stack &)
+    static_assert(std::is_same_v<decltype(stk)::value_type, A>, "");
+    static_assert(std::is_same_v<decltype(stk)::container_type, std::deque<A>>, "");
+    assert(stk.size() == 0);
+    }
+
+    {
+//  This one is odd - you can pass an allocator in to use, but the allocator
+//  has to match the type of the one used by the underlying container
+    typedef short T;
+    typedef test_allocator<T> A;
+    typedef std::deque<T, A> C;
+
+    C c{0,1,2,3};
+    std::stack<T, C> source(c);
+    std::stack stk(source, A(2)); // stack(stack &, allocator)
+    static_assert(std::is_same_v<decltype(stk)::value_type, T>, "");
+    static_assert(std::is_same_v<decltype(stk)::container_type, C>, "");
+    assert(stk.size() == 4);
+    assert(stk.top() == 3);
+    }
+
+}