Implement string_view from the library fundamentals TS (n4023). Also works in C++11 and 03, with reduced functionality (mostly in the area of constexpr)

llvm-svn: 210659

1 files changed, 71 insertions, 0 deletions

diff --git a/libcxx/test/experimental/string.view/string.view.comparison/opgt.string_view.pointer.pass.cpp b/libcxx/test/experimental/string.view/string.view.comparison/opgt.string_view.pointer.pass.cpp
new file mode 100644
index 00000000000..48703cac612
--- /dev/null
+++ b/libcxx/test/experimental/string.view/string.view.comparison/opgt.string_view.pointer.pass.cpp
@@ -0,0 +1,71 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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>
+
+// constexpr template<class charT, class traits, class Allocator>
+//   bool operator>(const charT* lhs, basic_string_wiew<charT,traits> rhs);
+// constexpr template<class charT, class traits, class Allocator>
+//   bool operator>(basic_string_wiew<charT,traits> lhs, const charT* rhs);
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const typename S::value_type* lhs, const S& rhs, bool x, bool y)
+{
+    assert((lhs > rhs) == x);
+    assert((rhs > lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::experimental::string_view S;
+    test("", S(""), false, false);
+    test("", S("abcde"), false, true);
+    test("", S("abcdefghij"), false, true);
+    test("", S("abcdefghijklmnopqrst"), false, true);
+    test("abcde", S(""), true, false);
+    test("abcde", S("abcde"), false, false);
+    test("abcde", S("abcdefghij"), false, true);
+    test("abcde", S("abcdefghijklmnopqrst"), false, true);
+    test("abcdefghij", S(""), true, false);
+    test("abcdefghij", S("abcde"), true, false);
+    test("abcdefghij", S("abcdefghij"), false, false);
+    test("abcdefghij", S("abcdefghijklmnopqrst"), false, true);
+    test("abcdefghijklmnopqrst", S(""), true, false);
+    test("abcdefghijklmnopqrst", S("abcde"), true, false);
+    test("abcdefghijklmnopqrst", S("abcdefghij"), true, false);
+    test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), false, false);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::experimental::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (!(sv1     > ""), "" );
+    static_assert (!(""      > sv1), "" );
+    static_assert (!(sv1     > "abcde"), "" );
+    static_assert (  "abcde" > sv1, "" );
+    
+    static_assert (  sv2      > "", "" );
+    static_assert (!(""       > sv2), "" );
+    static_assert (!(sv2      > "abcde"), "" );
+    static_assert (!("abcde"  > sv2), "" );
+    static_assert (!(sv2      > "abcde0"), "" );
+    static_assert (  "abcde0" > sv2, "" );
+    }
+#endif
+}