312 lines
13 KiB
C++
312 lines
13 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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#ifndef TEST_SUPPORT_DEDUCTION_GUIDES_SFINAE_CHECKS_H
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#define TEST_SUPPORT_DEDUCTION_GUIDES_SFINAE_CHECKS_H
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#include <functional>
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#include <initializer_list>
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#include <iterator>
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#include <memory>
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#include <type_traits>
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#include <utility>
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#include "test_macros.h"
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// `SFINAEs_away` template variable checks whether the template arguments for
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// a given template class `Instantiated` can be deduced from the given
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// constructor parameter types `CtrArgs` using CTAD.
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template<template<typename ...> class Instantiated, class ...CtrArgs,
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class = decltype(Instantiated(std::declval<CtrArgs>()...))>
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std::false_type SFINAEs_away_impl(int);
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template<template<typename ...> class Instantiated, class ...CtrArgs>
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std::true_type SFINAEs_away_impl(...);
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template<template<typename ...> class Instantiated, class ...CtrArgs>
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constexpr bool SFINAEs_away =
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decltype(SFINAEs_away_impl<Instantiated, CtrArgs...>(0))::value;
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// For sequence containers the deduction guides should be SFINAE'd away when
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// given:
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// - "bad" input iterators (that is, a type not qualifying as an input
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// iterator);
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// - a bad allocator.
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template<template<typename ...> class Container, typename InstantiatedContainer>
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constexpr void SequenceContainerDeductionGuidesSfinaeAway() {
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using Alloc = std::allocator<int>;
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using Iter = int*;
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struct BadAlloc {};
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// Note: the only requirement in the Standard is that integral types cannot be
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// considered input iterators; however, this doesn't work for sequence
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// containers because they have constructors of the form `(size_type count,
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// const value_type& value)`. These constructors would be used when passing
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// two integral types and would deduce `value_type` to be an integral type.
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#ifdef _LIBCPP_VERSION
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using OutputIter = std::insert_iterator<InstantiatedContainer>;
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#endif // _LIBCPP_VERSION
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// (iter, iter)
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//
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// Cannot deduce from (BAD_iter, BAD_iter)
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LIBCPP_STATIC_ASSERT(SFINAEs_away<Container, OutputIter, OutputIter>);
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// (iter, iter, alloc)
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//
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// Cannot deduce from (BAD_iter, BAD_iter, alloc)
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LIBCPP_STATIC_ASSERT(SFINAEs_away<Container, OutputIter, OutputIter, Alloc>);
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// Cannot deduce from (iter, iter, BAD_alloc)
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static_assert(SFINAEs_away<Container, Iter, Iter, BadAlloc>);
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// (alloc)
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//
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// Cannot deduce from (alloc)
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static_assert(SFINAEs_away<Container, Alloc>);
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}
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// For associative containers the deduction guides should be SFINAE'd away when
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// given:
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// - "bad" input iterators (that is, a type not qualifying as an input
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// iterator);
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// - a bad allocator;
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// - an allocator in place of a comparator.
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template<template<typename ...> class Container, typename InstantiatedContainer>
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constexpr void AssociativeContainerDeductionGuidesSfinaeAway() {
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using ValueType = typename InstantiatedContainer::value_type;
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using Comp = std::less<int>;
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using Alloc = std::allocator<ValueType>;
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using Iter = ValueType*;
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using InitList = std::initializer_list<ValueType>;
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struct BadAlloc {};
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// The only requirement in the Standard is that integral types cannot be
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// considered input iterators, beyond that it is unspecified.
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using BadIter = int;
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#ifdef _LIBCPP_VERSION
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using OutputIter = std::insert_iterator<InstantiatedContainer>;
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#endif // _LIBCPP_VERSION
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using AllocAsComp = Alloc;
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// (iter, iter)
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//
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// Cannot deduce from (BAD_iter, BAD_iter)
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static_assert(SFINAEs_away<Container, BadIter, BadIter>);
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LIBCPP_STATIC_ASSERT(SFINAEs_away<Container, OutputIter, OutputIter>);
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// (iter, iter, comp)
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//
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// Cannot deduce from (BAD_iter, BAD_iter, comp)
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static_assert(SFINAEs_away<Container, BadIter, BadIter, Comp>);
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LIBCPP_STATIC_ASSERT(SFINAEs_away<Container, OutputIter, OutputIter, Comp>);
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// (iter, iter, comp, alloc)
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//
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// Cannot deduce from (BAD_iter, BAD_iter, comp, alloc)
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static_assert(SFINAEs_away<Container, BadIter, BadIter, Comp, Alloc>);
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LIBCPP_STATIC_ASSERT(
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SFINAEs_away<Container, OutputIter, OutputIter, Comp, Alloc>);
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// Cannot deduce from (iter, iter, ALLOC_as_comp, alloc)
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static_assert(SFINAEs_away<Container, Iter, Iter, AllocAsComp, Alloc>);
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// Cannot deduce from (iter, iter, comp, BAD_alloc)
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static_assert(SFINAEs_away<Container, Iter, Iter, Comp, BadAlloc>);
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// (iter, iter, alloc)
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//
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// Cannot deduce from (BAD_iter, BAD_iter, alloc)
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static_assert(SFINAEs_away<Container, BadIter, BadIter, Alloc>);
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LIBCPP_STATIC_ASSERT(SFINAEs_away<Container, OutputIter, OutputIter, Alloc>);
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// Note: (iter, iter, BAD_alloc) is interpreted as (iter, iter, comp)
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// instead and fails upon instantiation. There is no requirement to SFINAE
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// away bad comparators.
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// (init_list, comp, alloc)
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//
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// Cannot deduce from (init_list, ALLOC_as_comp, alloc)
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static_assert(SFINAEs_away<Container, InitList, AllocAsComp, Alloc>);
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// Cannot deduce from (init_list, comp, BAD_alloc)
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static_assert(SFINAEs_away<Container, InitList, Comp, BadAlloc>);
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// (init_list, alloc)
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//
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// Note: (init_list, BAD_alloc) is interpreted as (init_list, comp) instead
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// and fails upon instantiation. There is no requirement to SFINAE away bad
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// comparators.
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}
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// For unordered containers the deduction guides should be SFINAE'd away when
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// given:
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// - "bad" input iterators (that is, a type not qualifying as an input
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// iterator);
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// - a bad allocator;
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// - a bad hash functor (an integral type in place of a hash);
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// - an allocator in place of a hash functor;
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// - an allocator in place of a predicate.
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template<template<typename ...> class Container, typename InstantiatedContainer>
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constexpr void UnorderedContainerDeductionGuidesSfinaeAway() {
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using ValueType = typename InstantiatedContainer::value_type;
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using Pred = std::equal_to<int>;
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using Hash = std::hash<int>;
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using Alloc = std::allocator<ValueType>;
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using Iter = ValueType*;
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using InitList = std::initializer_list<ValueType>;
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using BadHash = int;
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struct BadAlloc {};
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// The only requirement in the Standard is that integral types cannot be
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// considered input iterators, beyond that it is unspecified.
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using BadIter = int;
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#ifdef _LIBCPP_VERSION
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using OutputIter = std::insert_iterator<InstantiatedContainer>;
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#endif // _LIBCPP_VERSION
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using AllocAsHash = Alloc;
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using AllocAsPred = Alloc;
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// (iter, iter)
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//
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// Cannot deduce from (BAD_iter, BAD_iter)
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static_assert(SFINAEs_away<Container, BadIter, BadIter>);
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LIBCPP_STATIC_ASSERT(SFINAEs_away<Container, OutputIter, OutputIter>);
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// (iter, iter, buckets)
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//
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// Cannot deduce from (BAD_iter, BAD_iter, buckets)
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static_assert(SFINAEs_away<Container, BadIter, BadIter, size_t>);
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LIBCPP_STATIC_ASSERT(SFINAEs_away<Container, OutputIter, OutputIter, size_t>);
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// (iter, iter, buckets, hash)
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//
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// Cannot deduce from (BAD_iter, BAD_iter, buckets, hash)
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static_assert(SFINAEs_away<Container, BadIter, BadIter, size_t, Hash>);
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LIBCPP_STATIC_ASSERT(
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SFINAEs_away<Container, OutputIter, OutputIter, size_t, Hash>);
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// Cannot deduce from (iter, iter, buckets, BAD_hash)
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static_assert(SFINAEs_away<Container, Iter, Iter, size_t, BadHash>);
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// Note: (iter, iter, buckets, ALLOC_as_hash) is allowed -- it just calls
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// (iter, iter, buckets, alloc)
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// (iter, iter, buckets, hash, pred)
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//
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// Cannot deduce from (BAD_iter, BAD_iter, buckets, hash, pred)
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static_assert(SFINAEs_away<Container, BadIter, BadIter, size_t, Hash, Pred>);
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LIBCPP_STATIC_ASSERT(
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SFINAEs_away<Container, OutputIter, OutputIter, size_t, Hash, Pred>);
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// Cannot deduce from (iter, iter, buckets, BAD_hash, pred)
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static_assert(SFINAEs_away<Container, Iter, Iter, size_t, BadHash, Pred>);
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// Cannot deduce from (iter, iter, buckets, ALLOC_as_hash, pred)
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static_assert(SFINAEs_away<Container, Iter, Iter, size_t, AllocAsHash, Pred>);
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// Note: (iter, iter, buckets, hash, ALLOC_as_pred) is allowed -- it just
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// calls (iter, iter, buckets, hash, alloc)
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// (iter, iter, buckets, hash, pred, alloc)
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//
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// Cannot deduce from (BAD_iter, BAD_iter, buckets, hash, pred, alloc)
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static_assert(
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SFINAEs_away<Container, BadIter, BadIter, size_t, Hash, Pred, Alloc>);
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LIBCPP_STATIC_ASSERT(SFINAEs_away<Container, OutputIter, OutputIter,
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size_t, Hash, Pred, Alloc>);
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// Cannot deduce from (iter, iter, buckets, BAD_hash, pred, alloc)
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static_assert(
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SFINAEs_away<Container, Iter, Iter, size_t, BadHash, Pred, Alloc>);
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// Cannot deduce from (iter, iter, buckets, ALLOC_as_hash, pred, alloc)
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static_assert(
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SFINAEs_away<Container, Iter, Iter, size_t, AllocAsHash, Pred, Alloc>);
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// Cannot deduce from (iter, iter, buckets, hash, ALLOC_as_pred, alloc)
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static_assert(
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SFINAEs_away<Container, Iter, Iter, size_t, Hash, AllocAsPred, Alloc>);
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// Cannot deduce from (iter, iter, buckets, hash, pred, BAD_alloc)
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static_assert(
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SFINAEs_away<Container, Iter, Iter, size_t, Hash, Pred, BadAlloc>);
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// (iter, iter, buckets, alloc)
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//
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// Cannot deduce from (BAD_iter, BAD_iter, buckets, alloc)
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static_assert(SFINAEs_away<Container, BadIter, BadIter, size_t, Alloc>);
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LIBCPP_STATIC_ASSERT(
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SFINAEs_away<Container, OutputIter, OutputIter, size_t, Alloc>);
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// Note: (iter, iter, buckets, BAD_alloc) is interpreted as (iter, iter,
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// buckets, hash), which is valid because the only requirement for the hash
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// parameter is that it's not integral.
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// (iter, iter, alloc)
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//
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// Cannot deduce from (BAD_iter, BAD_iter, alloc)
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static_assert(SFINAEs_away<Container, BadIter, BadIter, Alloc>);
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LIBCPP_STATIC_ASSERT(SFINAEs_away<Container, OutputIter, OutputIter, Alloc>);
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// Cannot deduce from (iter, iter, BAD_alloc)
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static_assert(SFINAEs_away<Container, Iter, Iter, BadAlloc>);
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// (iter, iter, buckets, hash, alloc)
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//
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// Cannot deduce from (BAD_iter, BAD_iter, buckets, hash, alloc)
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static_assert(SFINAEs_away<Container, BadIter, BadIter, size_t, Hash, Alloc>);
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LIBCPP_STATIC_ASSERT(
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SFINAEs_away<Container, OutputIter, OutputIter, size_t, Hash, Alloc>);
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// Cannot deduce from (iter, iter, buckets, BAD_hash, alloc)
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static_assert(SFINAEs_away<Container, Iter, Iter, size_t, BadHash, Alloc>);
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// Cannot deduce from (iter, iter, buckets, ALLOC_as_hash, alloc)
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static_assert(
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SFINAEs_away<Container, Iter, Iter, size_t, AllocAsHash, Alloc>);
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// Note: (iter, iter, buckets, hash, BAD_alloc) is interpreted as (iter, iter,
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// buckets, hash, pred), which is valid because there are no requirements for
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// the predicate.
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// (init_list, buckets, hash)
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//
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// Cannot deduce from (init_list, buckets, BAD_hash)
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static_assert(SFINAEs_away<Container, InitList, size_t, BadHash>);
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// Note: (init_list, buckets, ALLOC_as_hash) is interpreted as (init_list,
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// buckets, alloc), which is valid.
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// (init_list, buckets, hash, pred)
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//
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// Cannot deduce from (init_list, buckets, BAD_hash, pred)
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static_assert(SFINAEs_away<Container, InitList, size_t, BadHash, Pred>);
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// Cannot deduce from (init_list, buckets, ALLOC_as_hash, pred)
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static_assert(SFINAEs_away<Container, InitList, size_t, AllocAsHash, Pred>);
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// Note: (init_list, buckets, hash, ALLOC_as_pred) is interpreted as
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// (init_list, buckets, hash, alloc), which is valid.
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// (init_list, buckets, hash, pred, alloc)
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//
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// Cannot deduce from (init_list, buckets, BAD_hash, pred, alloc)
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static_assert(
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SFINAEs_away<Container, InitList, size_t, BadHash, Pred, Alloc>);
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// Cannot deduce from (init_list, buckets, ALLOC_as_hash, pred, alloc)
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static_assert(
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SFINAEs_away<Container, InitList, size_t, AllocAsHash, Pred, Alloc>);
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// Cannot deduce from (init_list, buckets, hash, ALLOC_as_pred, alloc)
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static_assert(
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SFINAEs_away<Container, InitList, size_t, Hash, AllocAsPred, Alloc>);
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// Cannot deduce from (init_list, buckets, hash, pred, BAD_alloc)
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static_assert(
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SFINAEs_away<Container, InitList, size_t, Hash, Pred, BadAlloc>);
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// (init_list, buckets, alloc)
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//
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// Note: (init_list, buckets, BAD_alloc) is interpreted as (init_list,
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// buckets, hash), which is valid because the only requirement for the hash
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// parameter is that it's not integral.
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// (init_list, buckets, hash, alloc)
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//
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// Cannot deduce from (init_list, buckets, BAD_hash, alloc)
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static_assert(SFINAEs_away<Container, InitList, size_t, BadHash, Alloc>);
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// Cannot deduce from (init_list, buckets, ALLOC_as_hash, alloc)
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static_assert(SFINAEs_away<Container, InitList, size_t, AllocAsHash, Alloc>);
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// (init_list, alloc)
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//
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// Cannot deduce from (init_list, BAD_alloc)
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static_assert(SFINAEs_away<Container, InitList, BadAlloc>);
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}
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#endif // TEST_SUPPORT_DEDUCTION_GUIDES_SFINAE_CHECKS_H
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