Implement std::string_view as described in http://wg21.link/P0254R1. Reviewed as https://reviews.llvm.org/D21459
llvm-svn: 276238
diff --git a/libcxx/test/std/strings/string.view/string.view.ops/compare.sv.pass.cpp b/libcxx/test/std/strings/string.view/string.view.ops/compare.sv.pass.cpp
new file mode 100644
index 0000000..d119eff
--- /dev/null
+++ b/libcxx/test/std/strings/string.view/string.view.ops/compare.sv.pass.cpp
@@ -0,0 +1,121 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 int compare(basic_string_view str) const noexcept;
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+int sign ( int x ) { return x > 0 ? 1 : ( x < 0 ? -1 : 0 ); }
+
+template<typename CharT>
+void test1 ( std::basic_string_view<CharT> sv1,
+ std::basic_string_view<CharT> sv2, int expected ) {
+ assert ( sign( sv1.compare(sv2)) == sign(expected));
+}
+
+
+template<typename CharT>
+void test ( const CharT *s1, const CharT *s2, int expected ) {
+ typedef std::basic_string_view<CharT> string_view_t;
+
+ string_view_t sv1 ( s1 );
+ string_view_t sv2 ( s2 );
+ test1(sv1, sv2, expected);
+}
+
+int main () {
+
+ test("", "", 0);
+ test("", "abcde", -5);
+ test("", "abcdefghij", -10);
+ test("", "abcdefghijklmnopqrst", -20);
+ test("abcde", "", 5);
+ test("abcde", "abcde", 0);
+ test("abcde", "abcdefghij", -5);
+ test("abcde", "abcdefghijklmnopqrst", -15);
+ test("abcdefghij", "", 10);
+ test("abcdefghij", "abcde", 5);
+ test("abcdefghij", "abcdefghij", 0);
+ test("abcdefghij", "abcdefghijklmnopqrst", -10);
+ test("abcdefghijklmnopqrst", "", 20);
+ test("abcdefghijklmnopqrst", "abcde", 15);
+ test("abcdefghijklmnopqrst", "abcdefghij", 10);
+ test("abcdefghijklmnopqrst", "abcdefghijklmnopqrst", 0);
+
+ test(L"", L"", 0);
+ test(L"", L"abcde", -5);
+ test(L"", L"abcdefghij", -10);
+ test(L"", L"abcdefghijklmnopqrst", -20);
+ test(L"abcde", L"", 5);
+ test(L"abcde", L"abcde", 0);
+ test(L"abcde", L"abcdefghij", -5);
+ test(L"abcde", L"abcdefghijklmnopqrst", -15);
+ test(L"abcdefghij", L"", 10);
+ test(L"abcdefghij", L"abcde", 5);
+ test(L"abcdefghij", L"abcdefghij", 0);
+ test(L"abcdefghij", L"abcdefghijklmnopqrst", -10);
+ test(L"abcdefghijklmnopqrst", L"", 20);
+ test(L"abcdefghijklmnopqrst", L"abcde", 15);
+ test(L"abcdefghijklmnopqrst", L"abcdefghij", 10);
+ test(L"abcdefghijklmnopqrst", L"abcdefghijklmnopqrst", 0);
+
+#if TEST_STD_VER >= 11
+ test(u"", u"", 0);
+ test(u"", u"abcde", -5);
+ test(u"", u"abcdefghij", -10);
+ test(u"", u"abcdefghijklmnopqrst", -20);
+ test(u"abcde", u"", 5);
+ test(u"abcde", u"abcde", 0);
+ test(u"abcde", u"abcdefghij", -5);
+ test(u"abcde", u"abcdefghijklmnopqrst", -15);
+ test(u"abcdefghij", u"", 10);
+ test(u"abcdefghij", u"abcde", 5);
+ test(u"abcdefghij", u"abcdefghij", 0);
+ test(u"abcdefghij", u"abcdefghijklmnopqrst", -10);
+ test(u"abcdefghijklmnopqrst", u"", 20);
+ test(u"abcdefghijklmnopqrst", u"abcde", 15);
+ test(u"abcdefghijklmnopqrst", u"abcdefghij", 10);
+ test(u"abcdefghijklmnopqrst", u"abcdefghijklmnopqrst", 0);
+
+ test(U"", U"", 0);
+ test(U"", U"abcde", -5);
+ test(U"", U"abcdefghij", -10);
+ test(U"", U"abcdefghijklmnopqrst", -20);
+ test(U"abcde", U"", 5);
+ test(U"abcde", U"abcde", 0);
+ test(U"abcde", U"abcdefghij", -5);
+ test(U"abcde", U"abcdefghijklmnopqrst", -15);
+ test(U"abcdefghij", U"", 10);
+ test(U"abcdefghij", U"abcde", 5);
+ test(U"abcdefghij", U"abcdefghij", 0);
+ test(U"abcdefghij", U"abcdefghijklmnopqrst", -10);
+ test(U"abcdefghijklmnopqrst", U"", 20);
+ test(U"abcdefghijklmnopqrst", U"abcde", 15);
+ test(U"abcdefghijklmnopqrst", U"abcdefghij", 10);
+ test(U"abcdefghijklmnopqrst", U"abcdefghijklmnopqrst", 0);
+#endif
+
+#if _LIBCPP_STD_VER > 11
+ {
+ typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+ constexpr SV sv1 { "abcde", 5 };
+ constexpr SV sv2 { "abcde", 5 };
+ constexpr SV sv3 { "edcba0", 6 };
+ static_assert ( sv1.compare(sv2) == 0, "" );
+ static_assert ( sv2.compare(sv1) == 0, "" );
+ static_assert ( sv3.compare(sv2) > 0, "" );
+ static_assert ( sv2.compare(sv3) < 0, "" );
+ }
+#endif
+}