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33325524f5
The poisoned_hash_helper header was relying on an implicit forward declaration of std::hash located in <type_traits>. When we improve the modularization of the library, that causes issues, in addition to being a fundamentally non-portable assumption in the test suite. It turns out that the reason for relying on a forward declaration is to be able to test that std::hash is *not* provided if we don't include any header that provides it. But testing that is actually both non-portable and not really useful. Indeed, what harm does it make if additional headers provide std::hash specializations? That would certainly be conforming -- the Standard never requires an implementation to avoid providing a declaration when a given header is included, instead it mandates what *must* be provided for sure. In that spirit, it would be conforming for e.g. `<cstddef>` to define the hash specializations if that was our desire. I also don't read https://wg21.link/P0513R0 as going against that statement. Hence, this patch just removes that test which doesn't carry its weight. Fixes #56938
71 lines
2.3 KiB
C++
71 lines
2.3 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: c++03
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// UNSUPPORTED: !stdlib=libc++ && (c++11 || c++14)
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// <string_view>
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// Test that <string_view> provides all of the arithmetic, enum, and pointer
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// hash specializations.
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#include <string_view>
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#include "constexpr_char_traits.h"
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#include "poisoned_hash_helper.h"
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#include "test_macros.h"
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struct MyChar {
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char c;
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};
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template <>
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struct std::char_traits<MyChar> {
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using char_type = MyChar;
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using int_type = std::char_traits<char>::int_type;
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using off_type = std::char_traits<char>::off_type;
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using pos_type = std::char_traits<char>::pos_type;
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using state_type = std::char_traits<char>::state_type;
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static void assign(char_type&, const char_type&);
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static bool eq(char_type, char_type);
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static bool lt(char_type, char_type);
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static int compare(const char_type*, const char_type*, std::size_t);
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static std::size_t length(const char_type*);
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static const char_type* find(const char_type*, std::size_t, const char_type&);
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static char_type* move(char_type*, const char_type*, std::size_t);
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static char_type* copy(char_type*, const char_type*, std::size_t);
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static char_type* assign(char_type*, std::size_t, char_type);
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static int_type not_eof(int_type);
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static char_type to_char_type(int_type);
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static int_type to_int_type(char_type);
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static bool eq_int_type(int_type, int_type);
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static int_type eof();
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};
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int main(int, char**) {
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test_library_hash_specializations_available();
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{
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test_hash_enabled<std::string_view>();
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#ifndef TEST_HAS_NO_WIDE_CHARACTERS
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test_hash_enabled<std::wstring_view>();
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#endif
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#ifndef TEST_HAS_NO_CHAR8_T
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test_hash_enabled<std::u8string_view>();
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#endif
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test_hash_enabled<std::u16string_view>();
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test_hash_enabled<std::u32string_view>();
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test_hash_disabled<std::basic_string_view<MyChar, std::char_traits<MyChar>>>();
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test_hash_disabled<std::basic_string_view<char, constexpr_char_traits<char>>>();
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}
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return 0;
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}
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