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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_STD_AT_LEAST_20_OR_RUNTIME_EVALUATED) {
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) == true);
assert((abc <= abcdef) == true);
assert((abc0def <= abc) == false);
assert((abc0def <= abcdef) == true);
assert((abcdef <= abc) == false);
assert((abcdef <= abc0def) == false);
assert((abc.data() <= abc0def) == true);
assert((abc0def <= abc.data()) == false);
if (TEST_STD_AT_LEAST_20_OR_RUNTIME_EVALUATED) {
assert((std::basic_string<CharT, Traits>(abc) <= abc0def) == true);
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;
}
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