Implement LWG#2778: basic_string_view is missing constexpr.
llvm-svn: 292823
diff --git a/libcxx/test/std/strings/string.view/string.view.cons/assign.pass.cpp b/libcxx/test/std/strings/string.view/string.view.cons/assign.pass.cpp
new file mode 100644
index 0000000..b7348ea
--- /dev/null
+++ b/libcxx/test/std/strings/string.view/string.view.cons/assign.pass.cpp
@@ -0,0 +1,50 @@
+//===----------------------------------------------------------------------===//
+//
+// 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.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// constexpr basic_string_view& operator=(const basic_string_view &) noexcept = default;
+
+#include <string_view>
+#include <cassert>
+
+#include "test_macros.h"
+
+template<typename T>
+#if TEST_STD_VER > 11
+constexpr
+#endif
+bool test (T sv0)
+ {
+ T sv1;
+ sv1 = sv0;
+// We can't just say "sv0 == sv1" here because string_view::compare
+// isn't constexpr until C++17, and we want to support back to C++14
+ return sv0.size() == sv1.size() && sv0.data() == sv1.data();
+ }
+
+int main () {
+
+ assert( test<std::string_view> ( "1234"));
+#ifdef _LIBCPP_HAS_NO_UNICODE_CHARS
+ assert( test<std::u16string_view> (u"1234"));
+ assert( test<std::u32string_view> (U"1234"));
+#endif
+ assert( test<std::wstring_view> (L"1234"));
+
+#if TEST_STD_VER > 11
+ static_assert( test<std::string_view> ({ "abc", 3}), "");
+#ifdef _LIBCPP_HAS_NO_UNICODE_CHARS
+ static_assert( test<std::u16string_view> ({u"abc", 3}), "");
+ static_assert( test<std::u32string_view> ({U"abc", 3}), "");
+#endif
+ static_assert( test<std::wstring_view> ({L"abc", 3}), "");
+#endif
+}