deduct.pass.cpp
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <stack>
// UNSUPPORTED: c++03, c++11, c++14
// UNSUPPORTED: clang-5, apple-clang-9
// UNSUPPORTED: libcpp-no-deduction-guides
// Clang 5 will generate bad implicit deduction guides
// Specifically, for the copy constructor.
// template<class Container>
// stack(Container) -> stack<typename Container::value_type, Container>;
//
// template<class Container, class Allocator>
// stack(Container, Allocator) -> stack<typename Container::value_type, Container>;
#include <stack>
#include <vector>
#include <list>
#include <iterator>
#include <cassert>
#include <cstddef>
#include <climits> // INT_MAX
#include "test_macros.h"
#include "test_iterators.h"
#include "test_allocator.h"
struct A {};
int main(int, char**)
{
// Test the explicit deduction guides
{
std::vector<int> v{0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
std::stack stk(v);
static_assert(std::is_same_v<decltype(stk), std::stack<int, std::vector<int>>>, "");
assert(stk.size() == v.size());
assert(stk.top() == v.back());
}
{
std::list<long, test_allocator<long>> l{10, 11, 12, 13, 14, 15, 16, 17, 18, 19 };
std::stack stk(l, test_allocator<long>(0,2)); // different allocator
static_assert(std::is_same_v<decltype(stk)::container_type, std::list<long, test_allocator<long>>>, "");
static_assert(std::is_same_v<decltype(stk)::value_type, long>, "");
assert(stk.size() == 10);
assert(stk.top() == 19);
// I'd like to assert that we've gotten the right allocator in the stack, but
// I don't know how to get at the underlying container.
}
// Test the implicit deduction guides
{
// We don't expect this one to work - no way to implicitly get value_type
// std::stack stk(std::allocator<int>()); // stack (allocator &)
}
{
std::stack<A> source;
std::stack stk(source); // stack(stack &)
static_assert(std::is_same_v<decltype(stk)::value_type, A>, "");
static_assert(std::is_same_v<decltype(stk)::container_type, std::deque<A>>, "");
assert(stk.size() == 0);
}
{
// This one is odd - you can pass an allocator in to use, but the allocator
// has to match the type of the one used by the underlying container
typedef short T;
typedef test_allocator<T> A;
typedef std::deque<T, A> C;
C c{0,1,2,3};
std::stack<T, C> source(c);
std::stack stk(source, A(2)); // stack(stack &, allocator)
static_assert(std::is_same_v<decltype(stk)::value_type, T>, "");
static_assert(std::is_same_v<decltype(stk)::container_type, C>, "");
assert(stk.size() == 4);
assert(stk.top() == 3);
}
return 0;
}