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https://github.com/Gericom/teak-llvm.git
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57b08b0944
to reflect the new license. These used slightly different spellings that defeated my regular expressions. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351648
243 lines
7.3 KiB
C++
243 lines
7.3 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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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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#ifndef SUPPORT_POISONED_HASH_HELPER_HPP
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#define SUPPORT_POISONED_HASH_HELPER_HPP
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#include <type_traits>
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#include <cassert>
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#include "test_macros.h"
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#include "test_workarounds.h"
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#if TEST_STD_VER < 11
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#error this header may only be used in C++11 or newer
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#endif
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template <class ...Args> struct TypeList;
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// Test that the specified Hash meets the requirements of an enabled hash
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template <class Hash, class Key, class InputKey = Key>
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void test_hash_enabled(InputKey const& key = InputKey{});
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template <class T, class InputKey = T>
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void test_hash_enabled_for_type(InputKey const& key = InputKey{}) {
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return test_hash_enabled<std::hash<T>, T, InputKey>(key);
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}
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// Test that the specified Hash meets the requirements of a disabled hash.
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template <class Hash, class Key>
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void test_hash_disabled();
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template <class T>
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void test_hash_disabled_for_type() {
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return test_hash_disabled<std::hash<T>, T>();
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}
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namespace PoisonedHashDetail {
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enum Enum {};
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enum EnumClass : bool {};
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struct Class {};
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}
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// Each header that declares the template hash provides enabled
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// specializations of hash for nullptr t and all cv-unqualified
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// arithmetic, enumeration, and pointer types.
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using LibraryHashTypes = TypeList<
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#if TEST_STD_VER > 14
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decltype(nullptr),
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#endif
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bool,
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char,
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signed char,
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unsigned char,
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wchar_t,
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#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
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char16_t,
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char32_t,
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#endif
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short,
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unsigned short,
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int,
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unsigned int,
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long,
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unsigned long,
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long long,
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unsigned long long,
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#ifndef _LIBCPP_HAS_NO_INT128
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__int128_t,
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__uint128_t,
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#endif
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float,
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double,
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long double,
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#if TEST_STD_VER >= 14
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// Enum types
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PoisonedHashDetail::Enum,
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PoisonedHashDetail::EnumClass,
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#endif
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// pointer types
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void*,
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void const*,
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PoisonedHashDetail::Class*
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>;
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// Test that each of the library hash specializations for arithmetic types,
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// enum types, and pointer types are available and enabled.
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template <class Types = LibraryHashTypes>
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void test_library_hash_specializations_available(Types = Types{});
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namespace PoisonedHashDetail {
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template <class T, class = typename T::foo_bar_baz>
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constexpr bool instantiate(int) { return true; }
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template <class> constexpr bool instantiate(long) { return true; }
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template <class T> constexpr bool instantiate() { return instantiate<T>(0); }
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template <class To>
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struct ConvertibleToSimple {
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operator To() const {
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return To{};
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}
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};
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template <class To>
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struct ConvertibleTo {
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To to{};
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operator To&() & { return to; }
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operator To const&() const & { return to; }
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operator To&&() && { return std::move(to); }
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operator To const&&() const && { return std::move(to); }
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};
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template <class HashExpr,
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class Res = typename std::result_of<HashExpr>::type>
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constexpr bool can_hash(int) {
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return std::is_same<Res, size_t>::value;
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}
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template <class> constexpr bool can_hash(long) { return false; }
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template <class T> constexpr bool can_hash() { return can_hash<T>(0); }
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} // namespace PoisonedHashDetail
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template <class Hash, class Key, class InputKey>
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void test_hash_enabled(InputKey const& key) {
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using namespace PoisonedHashDetail;
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static_assert(std::is_destructible<Hash>::value, "");
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// Enabled hash requirements
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static_assert(std::is_default_constructible<Hash>::value, "");
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static_assert(std::is_copy_constructible<Hash>::value, "");
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static_assert(std::is_move_constructible<Hash>::value, "");
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static_assert(std::is_copy_assignable<Hash>::value, "");
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static_assert(std::is_move_assignable<Hash>::value, "");
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#if TEST_STD_VER > 14
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static_assert(std::is_swappable<Hash>::value, "");
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#elif defined(_LIBCPP_VERSION)
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static_assert(std::__is_swappable<Hash>::value, "");
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#endif
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// Hashable requirements
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static_assert(can_hash<Hash(Key&)>(), "");
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static_assert(can_hash<Hash(Key const&)>(), "");
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static_assert(can_hash<Hash(Key&&)>(), "");
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static_assert(can_hash<Hash const&(Key&)>(), "");
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static_assert(can_hash<Hash const&(Key const&)>(), "");
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static_assert(can_hash<Hash const&(Key&&)>(), "");
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static_assert(can_hash<Hash(ConvertibleToSimple<Key>&)>(), "");
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static_assert(can_hash<Hash(ConvertibleToSimple<Key> const&)>(), "");
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static_assert(can_hash<Hash(ConvertibleToSimple<Key>&&)>(), "");
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static_assert(can_hash<Hash(ConvertibleTo<Key>&)>(), "");
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static_assert(can_hash<Hash(ConvertibleTo<Key> const&)>(), "");
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static_assert(can_hash<Hash(ConvertibleTo<Key> &&)>(), "");
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static_assert(can_hash<Hash(ConvertibleTo<Key> const&&)>(), "");
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const Hash h{};
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assert(h(key) == h(key));
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}
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template <class Hash, class Key>
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void test_hash_disabled() {
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using namespace PoisonedHashDetail;
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// Disabled hash requirements
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static_assert(!std::is_default_constructible<Hash>::value, "");
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static_assert(!std::is_copy_constructible<Hash>::value, "");
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static_assert(!std::is_move_constructible<Hash>::value, "");
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static_assert(!std::is_copy_assignable<Hash>::value, "");
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static_assert(!std::is_move_assignable<Hash>::value, "");
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static_assert(!std::is_function<
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typename std::remove_pointer<
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typename std::remove_reference<Hash>::type
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>::type
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>::value, "");
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// Hashable requirements
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static_assert(!can_hash<Hash(Key&)>(), "");
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static_assert(!can_hash<Hash(Key const&)>(), "");
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static_assert(!can_hash<Hash(Key&&)>(), "");
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static_assert(!can_hash<Hash const&(Key&)>(), "");
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static_assert(!can_hash<Hash const&(Key const&)>(), "");
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static_assert(!can_hash<Hash const&(Key&&)>(), "");
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static_assert(!can_hash<Hash(ConvertibleToSimple<Key>&)>(), "");
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static_assert(!can_hash<Hash(ConvertibleToSimple<Key> const&)>(), "");
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static_assert(!can_hash<Hash(ConvertibleToSimple<Key>&&)>(), "");
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static_assert(!can_hash<Hash(ConvertibleTo<Key>&)>(), "");
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static_assert(!can_hash<Hash(ConvertibleTo<Key> const&)>(), "");
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static_assert(!can_hash<Hash(ConvertibleTo<Key> &&)>(), "");
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static_assert(!can_hash<Hash(ConvertibleTo<Key> const&&)>(), "");
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}
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template <class First, class ...Rest>
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struct TypeList<First, Rest...> {
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template <template <class> class Trait, bool Expect = true>
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static constexpr bool assertTrait() {
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static_assert(Trait<First>::value == Expect, "");
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return TypeList<Rest...>::template assertTrait<Trait, Expect>();
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}
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template <class Trait>
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static void applyTrait() {
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Trait::template apply<First>();
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TypeList<Rest...>::template applyTrait<Trait>();
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}
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};
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template <>
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struct TypeList<> {
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template <template <class> class Trait, bool Expect = true>
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static constexpr bool assertTrait() {
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return true;
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}
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template <class Trait>
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static void applyTrait() {}
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};
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struct TestLibraryTrait {
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template <class Type>
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static void apply() { test_hash_enabled<std::hash<Type>, Type>(); }
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};
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template <class Types>
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void test_library_hash_specializations_available(Types) {
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Types::template applyTrait<TestLibraryTrait >();
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}
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#endif // SUPPORT_POISONED_HASH_HELPER_HPP
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