Implement std::string_view as described in http://wg21.link/P0254R1. Reviewed as https://reviews.llvm.org/D21459

llvm-svn: 276238

1 files changed, 56 insertions, 0 deletions

diff --git a/libcxx/test/std/strings/string.view/string.view.cons/from_string.pass.cpp b/libcxx/test/std/strings/string.view/string.view.cons/from_string.pass.cpp
new file mode 100644
index 00000000000..3ca6ea16f5b
--- /dev/null
+++ b/libcxx/test/std/strings/string.view/string.view.cons/from_string.pass.cpp
@@ -0,0 +1,56 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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>
+
+// template<class Allocator>
+// basic_string_view(const basic_string<_CharT, _Traits, Allocator>& _str) noexcept
+
+
+#include <string_view>
+#include <string>
+#include <cassert>
+
+#include "test_macros.h"
+
+struct dummy_char_traits : public std::char_traits<char> {};
+
+template<typename CharT, typename Traits>
+void test ( const std::basic_string<CharT, Traits> &str ) {
+    std::basic_string_view<CharT, Traits> sv1 ( str );
+    assert ( sv1.size() == str.size());
+    assert ( sv1.data() == str.data());
+}
+
+int main () {
+
+    test ( std::string("QBCDE") );
+    test ( std::string("") );
+    test ( std::string() );
+
+    test ( std::wstring(L"QBCDE") );
+    test ( std::wstring(L"") );
+    test ( std::wstring() );
+
+#if TEST_STD_VER >= 11
+    test ( std::u16string{u"QBCDE"} );
+    test ( std::u16string{u""} );
+    test ( std::u16string{} );
+
+    test ( std::u32string{U"QBCDE"} );
+    test ( std::u32string{U""} );
+    test ( std::u32string{} );
+#endif
+
+    test ( std::basic_string<char, dummy_char_traits>("QBCDE") );
+    test ( std::basic_string<char, dummy_char_traits>("") );
+    test ( std::basic_string<char, dummy_char_traits>() );
+
+}