Dan Albert | 287553d | 2017-02-16 10:47:51 -0800 | [diff] [blame] | 1 | //===----------------------------------------------------------------------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is dual licensed under the MIT and the University of Illinois Open |
| 6 | // Source Licenses. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | // UNSUPPORTED: c++98, c++03 |
| 11 | |
| 12 | // <experimental/memory_resource> |
| 13 | |
| 14 | // template <class T> class polymorphic_allocator |
| 15 | |
| 16 | // EXTENSION |
| 17 | // std::size_t polymorphic_allocator<T>::max_size() const noexcept |
| 18 | |
| 19 | #include <experimental/memory_resource> |
| 20 | #include <type_traits> |
| 21 | #include <cassert> |
| 22 | |
| 23 | #include "test_memory_resource.hpp" |
| 24 | |
| 25 | namespace ex = std::experimental::pmr; |
| 26 | |
| 27 | template <std::size_t S> |
| 28 | std::size_t getMaxSize() { |
| 29 | using T = typename std::aligned_storage<S>::type; |
| 30 | static_assert(sizeof(T) == S, "Required for test"); |
| 31 | return ex::polymorphic_allocator<T>{}.max_size(); |
| 32 | } |
| 33 | |
| 34 | template <std::size_t S, std::size_t A> |
| 35 | std::size_t getMaxSize() { |
| 36 | using T = typename std::aligned_storage<S, A>::type; |
| 37 | static_assert(sizeof(T) == S, "Required for test"); |
| 38 | return ex::polymorphic_allocator<T>{}.max_size(); |
| 39 | } |
| 40 | |
| 41 | int main() |
| 42 | { |
| 43 | { |
| 44 | using Alloc = ex::polymorphic_allocator<int>; |
| 45 | using Traits = std::allocator_traits<Alloc>; |
| 46 | const Alloc a; |
| 47 | static_assert(std::is_same<decltype(a.max_size()), Traits::size_type>::value, ""); |
| 48 | static_assert(noexcept(a.max_size()), ""); |
| 49 | } |
| 50 | { |
| 51 | constexpr std::size_t Max = std::numeric_limits<std::size_t>::max(); |
| 52 | assert(getMaxSize<1>() == Max); |
| 53 | assert(getMaxSize<2>() == Max / 2); |
| 54 | assert(getMaxSize<4>() == Max / 4); |
| 55 | assert(getMaxSize<8>() == Max / 8); |
| 56 | assert(getMaxSize<16>() == Max / 16); |
| 57 | assert(getMaxSize<32>() == Max / 32); |
| 58 | assert(getMaxSize<64>() == Max / 64); |
| 59 | assert(getMaxSize<1024>() == Max / 1024); |
| 60 | |
| 61 | assert((getMaxSize<6, 2>() == Max / 6)); |
| 62 | assert((getMaxSize<12, 4>() == Max / 12)); |
| 63 | } |
| 64 | } |