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, 64 insertions, 0 deletions

diff --git a/libcxx/test/experimental/string.view/string.view.comparison/ople.string_view.string_view.pass.cpp b/libcxx/test/experimental/string.view/string.view.comparison/ople.string_view.string_view.pass.cpp
new file mode 100644
index 00000000000..17219a42602
--- /dev/null
+++ b/libcxx/test/experimental/string.view/string.view.comparison/ople.string_view.string_view.pass.cpp
@@ -0,0 +1,64 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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>
+
+// template<class charT, class traits>
+//   constexpr bool operator<=(basic_string_view<charT,traits> lhs,
+//                  basic_string_view<charT,traits> rhs);
+
+#include <experimental/string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& 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(""), S(""), true, true);
+    test(S(""), S("abcde"), true, false);
+    test(S(""), S("abcdefghij"), true, false);
+    test(S(""), S("abcdefghijklmnopqrst"), true, false);
+    test(S("abcde"), S(""), false, true);
+    test(S("abcde"), S("abcde"), true, true);
+    test(S("abcde"), S("abcdefghij"), true, false);
+    test(S("abcde"), S("abcdefghijklmnopqrst"), true, false);
+    test(S("abcdefghij"), S(""), false, true);
+    test(S("abcdefghij"), S("abcde"), false, true);
+    test(S("abcdefghij"), S("abcdefghij"), true, true);
+    test(S("abcdefghij"), S("abcdefghijklmnopqrst"), true, false);
+    test(S("abcdefghijklmnopqrst"), S(""), false, true);
+    test(S("abcdefghijklmnopqrst"), S("abcde"), false, true);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghij"), false, true);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), true, true);
+    }
+
+#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 <= sv1,  "" );
+    static_assert (  sv2 <= sv2,  "" );
+
+    static_assert (  sv1 <= sv2,  "" );
+    static_assert (!(sv2 <= sv1), "" );
+    }
+#endif
+}