113 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: !stdlib=libc++ && (c++03 || c++11 || c++14)10 11// <string_view>12 13// template<class charT, class traits>14// constexpr bool operator>=(basic_string_view<charT, traits> lhs, basic_string_view<charT, traits> rhs);15// (plus "sufficient additional overloads" to make implicit conversions work as intended)16 17#include <string_view>18#include <cassert>19#include <string>20 21#include "test_macros.h"22#include "constexpr_char_traits.h"23#include "make_string.h"24 25template <class T>26struct ConvertibleTo {27 T t_;28 TEST_CONSTEXPR explicit ConvertibleTo(T t) : t_(t) {}29 TEST_CONSTEXPR operator T() const { return t_; }30};31 32template <class SV>33TEST_CONSTEXPR_CXX14 bool test() {34 typedef typename SV::value_type CharT;35 typedef typename SV::traits_type Traits;36 37 // Test the behavior of the operator, both with and without implicit conversions.38 SV v[] = {39 SV(MAKE_CSTRING(CharT, "")),40 SV(MAKE_CSTRING(CharT, "abc")),41 SV(MAKE_CSTRING(CharT, "abcdef")),42 SV(MAKE_CSTRING(CharT, "acb")),43 };44 for (int i = 0; i < 4; ++i) {45 for (int j = 0; j < 4; ++j) {46 // See http://eel.is/c++draft/string.view#tab:string.view.comparison.overloads47 bool expected = (i >= j);48 assert((v[i] >= v[j]) == expected);49 assert((v[i].data() >= v[j]) == expected);50 assert((v[i] >= v[j].data()) == expected);51 assert((ConvertibleTo<SV>(v[i]) >= v[j]) == expected);52 assert((v[i] >= ConvertibleTo<SV>(v[j])) == expected);53 54 if (TEST_STD_AT_LEAST_20_OR_RUNTIME_EVALUATED) {55 assert((std::basic_string<CharT, Traits>(v[i]) >= v[j]) == expected);56 assert((v[i] >= std::basic_string<CharT, Traits>(v[j])) == expected);57 }58 }59 }60 61 // Test its behavior with embedded null bytes.62 SV abc = SV(MAKE_CSTRING(CharT, "abc"));63 SV abc0def = SV(MAKE_CSTRING(CharT, "abc\0def"), 7);64 SV abcdef = SV(MAKE_CSTRING(CharT, "abcdef"));65 assert((abc >= abc0def) == false);66 assert((abc >= abcdef) == false);67 assert((abc0def >= abc) == true);68 assert((abc0def >= abcdef) == false);69 assert((abcdef >= abc) == true);70 assert((abcdef >= abc0def) == true);71 72 assert((abc.data() >= abc0def) == false);73 assert((abc0def >= abc.data()) == true);74 75 if (TEST_STD_AT_LEAST_20_OR_RUNTIME_EVALUATED) {76 assert((std::basic_string<CharT, Traits>(abc) >= abc0def) == false);77 assert((abc0def >= std::basic_string<CharT, Traits>(abc)) == true);78 }79 80 return true;81}82 83int main(int, char**) {84 test<std::string_view>();85#ifndef TEST_HAS_NO_WIDE_CHARACTERS86 test<std::wstring_view>();87#endif88#if TEST_STD_VER >= 1189 test<std::u16string_view>();90 test<std::u32string_view>();91#endif92#if TEST_STD_VER > 1493 static_assert(test<std::string_view>(), "");94# ifndef TEST_HAS_NO_WIDE_CHARACTERS95 static_assert(test<std::wstring_view>(), "");96# endif97 static_assert(test<std::u16string_view>(), "");98 static_assert(test<std::u32string_view>(), "");99#endif100 101#if TEST_STD_VER > 11102 test<std::basic_string_view<char, constexpr_char_traits<char>>>();103 static_assert(test<std::basic_string_view<char, constexpr_char_traits<char>>>(), "");104#endif105 106#if TEST_STD_VER > 17107 test<std::u8string_view>();108 static_assert(test<std::u8string_view>());109#endif110 111 return 0;112}113