13858ee056
Summary: This patch adds the `<experimental/tuple>` header (almost) as specified in the latest draft of the library fundamentals TS. The main changes in this patch are: 1. Added variable template `tuple_size_v` 2. Added function `apply(Func &&, Tuple &&)`. 3. Changed `__invoke` to be `_LIBCPP_CONSTEXPR_AFTER_CXX11`. The `apply(...)` implementation uses `__invoke` to invoke the given function. `__invoke` already provides the required functionality. Using `__invoke` also allows `apply` to be used on pointers to member function/objects as an extension. In order to facilitate this `__invoke` has to be marked `constexpr`. Test Plan: Each new feature was tested. The test cases for `tuple_size_v` are as follows: 1. tuple_size_v.pass.cpp - Check `tuple_size_v` on cv qualified tuples, pairs and arrays. 2. tuple_size_v.fail.cpp - Test on reference type. 3. tuple_size_v_2.fail.cpp - Test on non-tuple 4. tuple_size_v_3.fail.cpp - Test on pointer type. The test cases for tuple.apply are as follows: 1. arg_type.pass.cpp - Ensure that ref/pointer/cv qualified types are properly passed. 2. constexpr_types.pass.cpp - Ensure constexpr evaluation of apply is possible for `tuple` and `pair`. 3. extended_types.pass.cpp - Test apply on function types permitted by extension. 4. large_arity.pass.cpp - Test that apply can evaluated on tuples and arrays with large sizes. 5. ref_qualifiers.pass.cpp - Test that apply respects ref qualified functions. 6. return_type.pass.cpp - Test that apply returns the proper type. 7. types.pass.cpp - Test apply on function types as required by LFTS. Reviewers: mclow.lists Reviewed By: mclow.lists Subscribers: cfe-commits Differential Revision: http://reviews.llvm.org/D4512 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@232515 91177308-0d34-0410-b5e6-96231b3b80d8
147 lines
3.6 KiB
C++
147 lines
3.6 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03, c++11
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// <experimental/tuple>
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// template <class F, class T> constexpr decltype(auto) apply(F &&, T &&)
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// Stress testing large arities with tuple and array.
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#include <experimental/tuple>
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#include <array>
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#include <utility>
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#include <cassert>
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////////////////////////////////////////////////////////////////////////////////
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template <class T, std::size_t Dummy = 0>
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struct always_imp
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{
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typedef T type;
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};
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template <class T, std::size_t Dummy = 0>
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using always_t = typename always_imp<T, Dummy>::type;
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////////////////////////////////////////////////////////////////////////////////
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template <class Tuple, class Idx>
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struct make_function;
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template <class Tp, std::size_t ...Idx>
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struct make_function<Tp, std::integer_sequence<std::size_t, Idx...>>
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{
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using type = bool (*)(always_t<Tp, Idx>...);
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};
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template <class Tp, std::size_t Size>
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using make_function_t = typename make_function<Tp, std::make_index_sequence<Size>>::type;
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////////////////////////////////////////////////////////////////////////////////
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template <class Tp, class Idx>
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struct make_tuple_imp;
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////////////////////////////////////////////////////////////////////////////////
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template <class Tp, std::size_t ...Idx>
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struct make_tuple_imp<Tp, std::integer_sequence<std::size_t, Idx...>>
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{
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using type = std::tuple<always_t<Tp, Idx>...>;
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};
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template <class Tp, std::size_t Size>
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using make_tuple_t = typename make_tuple_imp<Tp, std::make_index_sequence<Size>>::type;
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template <class ...Types>
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bool test_apply_fn(Types...) { return true; }
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namespace ex = std::experimental;
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template <std::size_t Size>
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void test_all()
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{
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using A = std::array<int, Size>;
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using ConstA = std::array<int const, Size>;
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using Tuple = make_tuple_t<int, Size>;
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using CTuple = make_tuple_t<const int, Size>;
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using ValFn = make_function_t<int, Size>;
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ValFn val_fn = &test_apply_fn;
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using RefFn = make_function_t<int &, Size>;
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RefFn ref_fn = &test_apply_fn;
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using CRefFn = make_function_t<int const &, Size>;
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CRefFn cref_fn = &test_apply_fn;
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using RRefFn = make_function_t<int &&, Size>;
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RRefFn rref_fn = &test_apply_fn;
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{
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A a{};
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assert(ex::apply(val_fn, a));
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assert(ex::apply(ref_fn, a));
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assert(ex::apply(cref_fn, a));
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assert(ex::apply(rref_fn, std::move(a)));
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}
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{
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ConstA a{};
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assert(ex::apply(val_fn, a));
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assert(ex::apply(cref_fn, a));
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}
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{
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Tuple a{};
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assert(ex::apply(val_fn, a));
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assert(ex::apply(ref_fn, a));
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assert(ex::apply(cref_fn, a));
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assert(ex::apply(rref_fn, std::move(a)));
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}
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{
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CTuple a{};
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assert(ex::apply(val_fn, a));
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assert(ex::apply(cref_fn, a));
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}
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}
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template <std::size_t Size>
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void test_one()
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{
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using A = std::array<int, Size>;
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using Tuple = make_tuple_t<int, Size>;
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using ValFn = make_function_t<int, Size>;
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ValFn val_fn = &test_apply_fn;
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{
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A a{};
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assert(ex::apply(val_fn, a));
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}
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{
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Tuple a{};
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assert(ex::apply(val_fn, a));
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}
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}
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int main()
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{
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// Instantiate with 1-5 arguments.
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test_all<1>();
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test_all<2>();
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test_all<3>();
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test_all<4>();
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test_all<5>();
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// Stress test with 128.
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test_one<128>();
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//test_one<256>();
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}
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