| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++03 |
| |
| // Test that libc++ does not generate a warning diagnostic about the comparator |
| // or the hasher too early for containers of incomplete types. |
| // |
| // See PR41360. |
| |
| #include <unordered_set> |
| #include <unordered_map> |
| #include <functional> |
| |
| #include "test_macros.h" |
| |
| |
| template <template <typename ...> class Container> |
| void test_set() { |
| struct KeyBase { }; |
| struct KeyDerived; // derives from KeyBase, but incomplete at this point |
| |
| // Name the type but don't instantiate it. |
| using C = Container<KeyDerived*, std::hash<KeyBase*>, std::equal_to<KeyBase*>>; |
| |
| // Instantiate it but don't ODR use any members. |
| typename C::value_type dummy; (void)dummy; |
| |
| // Complete the types. |
| struct KeyDerived : KeyBase { }; |
| |
| C c; // ODR use it, which should be OK |
| } |
| |
| template <template <typename ...> class Container> |
| void test_map() { |
| struct Value { }; |
| struct KeyBase { }; |
| struct KeyDerived; |
| using C = Container<KeyDerived*, Value, std::hash<KeyBase*>, std::equal_to<KeyBase*>>; |
| typename C::value_type dummy; (void)dummy; |
| struct KeyDerived : KeyBase { }; |
| C c; |
| } |
| |
| int main(int, char**) { |
| // expected-no-diagnostics |
| test_set<std::unordered_set>(); |
| test_set<std::unordered_multiset>(); |
| test_map<std::unordered_map>(); |
| test_map<std::unordered_multimap>(); |
| |
| return 0; |
| } |