From 28e0187175ceeadae61d01fcedefa15f97f454f0 Mon Sep 17 00:00:00 2001
From: Zoe Carver <z.zoelec2@gmail.com>
Date: Fri, 5 Jul 2019 20:13:34 +0000
Subject: This patch makes swap functions constexpr. Both swap overloads,
 swap_ranges and iter_swap are updated (with tests).

llvm-svn: 365238
---
 .../std/utilities/utility/utility.swap/swap.pass.cpp   | 14 ++++++++++++++
 .../utilities/utility/utility.swap/swap_array.pass.cpp | 18 ++++++++++++++++++
 2 files changed, 32 insertions(+)

(limited to 'libcxx/test/std/utilities')

diff --git a/libcxx/test/std/utilities/utility/utility.swap/swap.pass.cpp b/libcxx/test/std/utilities/utility/utility.swap/swap.pass.cpp
index f52af4cb896..c9146ee7637 100644
--- a/libcxx/test/std/utilities/utility/utility.swap/swap.pass.cpp
+++ b/libcxx/test/std/utilities/utility/utility.swap/swap.pass.cpp
@@ -62,6 +62,16 @@ constexpr bool can_swap() {
 }
 #endif
 
+#if TEST_STD_VER > 17
+constexpr bool test_swap_constexpr()
+{
+    int i = 1;
+    int j = 2;
+    std::swap(i, j);
+    return i == 2 && j == 1;
+}
+#endif // TEST_STD_VER > 17
+
 int main(int, char**)
 {
 
@@ -100,5 +110,9 @@ int main(int, char**)
     }
 #endif
 
+#if TEST_STD_VER > 17
+    static_assert(test_swap_constexpr());
+#endif // TEST_STD_VER > 17
+
   return 0;
 }
diff --git a/libcxx/test/std/utilities/utility/utility.swap/swap_array.pass.cpp b/libcxx/test/std/utilities/utility/utility.swap/swap_array.pass.cpp
index 015e85a0135..512505b78f0 100644
--- a/libcxx/test/std/utilities/utility/utility.swap/swap_array.pass.cpp
+++ b/libcxx/test/std/utilities/utility/utility.swap/swap_array.pass.cpp
@@ -53,6 +53,20 @@ constexpr bool can_swap() {
 }
 #endif
 
+#if TEST_STD_VER > 17
+constexpr bool test_swap_constexpr()
+{
+    int i[3] = {1, 2, 3};
+    int j[3] = {4, 5, 6};
+    std::swap(i, j);
+    return i[0] == 4 &&
+           i[1] == 5 &&
+           i[2] == 6 &&
+           j[0] == 1 &&
+           j[1] == 2 &&
+           j[2] == 3;
+}
+#endif // TEST_STD_VER > 17
 
 int main(int, char**)
 {
@@ -98,5 +112,9 @@ int main(int, char**)
     }
 #endif
 
+#if TEST_STD_VER > 17
+    static_assert(test_swap_constexpr());
+#endif // TEST_STD_VER > 17
+
   return 0;
 }
-- 
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