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 // <stack> 11 // UNSUPPORTED: c++98, c++03, c++11, c++14 12 // UNSUPPORTED: clang-5, apple-clang-9 13 // UNSUPPORTED: libcpp-no-deduction-guides 14 // Clang 5 will generate bad implicit deduction guides 15 // Specifically, for the copy constructor. 16 17 18 // template<class Container> 19 // stack(Container) -> stack<typename Container::value_type, Container>; 20 // 21 // template<class Container, class Allocator> 22 // stack(Container, Allocator) -> stack<typename Container::value_type, Container>; 23 24 25 #include <stack> 26 #include <vector> 27 #include <list> 28 #include <iterator> 29 #include <cassert> 30 #include <cstddef> 31 #include <climits> // INT_MAX 32 33 #include "test_macros.h" 34 #include "test_iterators.h" 35 #include "test_allocator.h" 36 37 struct A {}; 38 39 int main() 40 { 41 42 // Test the explicit deduction guides 43 { 44 std::vector<int> v{0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }; 45 std::stack stk(v); 46 47 static_assert(std::is_same_v<decltype(stk), std::stack<int, std::vector<int>>>, ""); 48 assert(stk.size() == v.size()); 49 assert(stk.top() == v.back()); 50 } 51 52 { 53 std::list<long, test_allocator<long>> l{10, 11, 12, 13, 14, 15, 16, 17, 18, 19 }; 54 std::stack stk(l, test_allocator<long>(0,2)); // different allocator 55 static_assert(std::is_same_v<decltype(stk)::container_type, std::list<long, test_allocator<long>>>, ""); 56 static_assert(std::is_same_v<decltype(stk)::value_type, long>, ""); 57 assert(stk.size() == 10); 58 assert(stk.top() == 19); 59 // I'd like to assert that we've gotten the right allocator in the stack, but 60 // I don't know how to get at the underlying container. 61 } 62 63 // Test the implicit deduction guides 64 65 { 66 // We don't expect this one to work - no way to implicitly get value_type 67 // std::stack stk(std::allocator<int>()); // stack (allocator &) 68 } 69 70 { 71 std::stack<A> source; 72 std::stack stk(source); // stack(stack &) 73 static_assert(std::is_same_v<decltype(stk)::value_type, A>, ""); 74 static_assert(std::is_same_v<decltype(stk)::container_type, std::deque<A>>, ""); 75 assert(stk.size() == 0); 76 } 77 78 { 79 // This one is odd - you can pass an allocator in to use, but the allocator 80 // has to match the type of the one used by the underlying container 81 typedef short T; 82 typedef test_allocator<T> A; 83 typedef std::deque<T, A> C; 84 85 C c{0,1,2,3}; 86 std::stack<T, C> source(c); 87 std::stack stk(source, A(2)); // stack(stack &, allocator) 88 static_assert(std::is_same_v<decltype(stk)::value_type, T>, ""); 89 static_assert(std::is_same_v<decltype(stk)::container_type, C>, ""); 90 assert(stk.size() == 4); 91 assert(stk.top() == 3); 92 } 93 94 } 95
