forked from OSchip/llvm-project
117 lines
3.7 KiB
C++
117 lines
3.7 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// <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) {
|
|
// TODO FIXME: once P0980 "Making std::string constexpr" is implemented
|
|
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_IS_CONSTANT_EVALUATED) {
|
|
// TODO FIXME: once P0980 "Making std::string constexpr" is implemented
|
|
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;
|
|
}
|