Initial commit

module/jni/libcxx/test/std/strings/string.view/string.view.comparison/equal.pass.cpp

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+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: !stdlib=libc++ && (c++03 || c++11 || c++14)
+
+// <string_view>
+
+// template<class charT, class traits>
+//   constexpr bool operator==(basic_string_view<charT, traits> lhs, basic_string_view<charT, traits> rhs);
+// (plus "sufficient additional overloads" to make implicit conversions work as intended)
+
+#include <string_view>
+#include <cassert>
+#include <string>
+
+#include "test_macros.h"
+#include "constexpr_char_traits.h"
+#include "make_string.h"
+
+template<class T>
+struct ConvertibleTo {
+    T t_;
+    TEST_CONSTEXPR explicit ConvertibleTo(T t) : t_(t) {}
+    TEST_CONSTEXPR operator T() const {
+        return t_;
+    }
+};
+
+template<class SV>
+TEST_CONSTEXPR_CXX14 bool test()
+{
+    typedef typename SV::value_type CharT;
+    typedef typename SV::traits_type Traits;
+
+    // Test the behavior of the operator, both with and without implicit conversions.
+    SV v[] = {
+        SV(MAKE_CSTRING(CharT, "")),
+        SV(MAKE_CSTRING(CharT, "abc")),
+        SV(MAKE_CSTRING(CharT, "abcdef")),
+        SV(MAKE_CSTRING(CharT, "acb")),
+    };
+    for (int i = 0; i < 4; ++i) {
+        for (int j = 0; j < 4; ++j) {
+            // See http://eel.is/c++draft/string.view#tab:string.view.comparison.overloads
+            bool expected = (i == j);
+            assert((v[i] == v[j]) == expected);
+            assert((v[i].data() == v[j]) == expected);
+            assert((v[i] == v[j].data()) == expected);
+            assert((ConvertibleTo<SV>(v[i]) == v[j]) == expected);
+            assert((v[i] == ConvertibleTo<SV>(v[j])) == expected);
+
+            if (!TEST_IS_CONSTANT_EVALUATED || TEST_STD_VER >= 20) {
+                assert((std::basic_string<CharT, Traits>(v[i]) == v[j]) == expected);
+                assert((v[i] == std::basic_string<CharT, Traits>(v[j])) == expected);
+            }
+        }
+    }
+
+    // Test its behavior with embedded null bytes.
+    SV abc = SV(MAKE_CSTRING(CharT, "abc"));
+    SV abc0def = SV(MAKE_CSTRING(CharT, "abc\0def"), 7);
+    SV abcdef = SV(MAKE_CSTRING(CharT, "abcdef"));
+    assert((abc == abc0def) == false);
+    assert((abc == abcdef) == false);
+    assert((abc0def == abc) == false);
+    assert((abc0def == abcdef) == false);
+    assert((abcdef == abc) == false);
+    assert((abcdef == abc0def) == false);
+
+    assert((abc.data() == abc0def) == false);
+    assert((abc0def == abc.data()) == false);
+
+    if (!TEST_IS_CONSTANT_EVALUATED || TEST_STD_VER >= 20) {
+        assert((std::basic_string<CharT, Traits>(abc) == abc0def) == false);
+        assert((abc0def == std::basic_string<CharT, Traits>(abc)) == false);
+    }
+
+    return true;
+}
+
+int main(int, char**)
+{
+    test<std::string_view>();
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+    test<std::wstring_view>();
+#endif
+#if TEST_STD_VER >= 11
+    test<std::u16string_view>();
+    test<std::u32string_view>();
+#endif
+#if TEST_STD_VER > 14
+    static_assert(test<std::string_view>(), "");
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+    static_assert(test<std::wstring_view>(), "");
+#endif
+    static_assert(test<std::u16string_view>(), "");
+    static_assert(test<std::u32string_view>(), "");
+#endif
+
+#if TEST_STD_VER > 11
+    test<std::basic_string_view<char, constexpr_char_traits<char>>>();
+    static_assert(test<std::basic_string_view<char, constexpr_char_traits<char>>>(), "");
+#endif
+
+#if TEST_STD_VER > 17
+    test<std::u8string_view>();
+    static_assert(test<std::u8string_view>());
+#endif
+
+    return 0;
+}