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