libcxx/test/std/containers/unord/unord.set/incomplete.pass.cpp

   1
   2
   3 //===----------------------------------------------------------------------===//
   4 //
   5 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   6 // See https://llvm.org/LICENSE.txt for license information.
   7 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   8 //
   9 //===----------------------------------------------------------------------===//
  10
  11 // <unordered_set>
  12
  13 // Check that std::unordered_set and its iterators can be instantiated with an incomplete
  14 // type.
  15
  16 #include <unordered_set>
  17
  18 #include "test_macros.h"
  19
  20 template <class Tp>
  21 struct MyHash {
  22   MyHash() {}
  23   std::size_t operator()(Tp const&) const {return 42;}
  24 };
  25
  26 struct A {
  27     typedef std::unordered_set<A, MyHash<A> > Map;
  28     Map m;
  29     Map::iterator it;
  30     Map::const_iterator cit;
  31     Map::local_iterator lit;
  32     Map::const_local_iterator clit;
  33 };
  34
  35 inline bool operator==(A const& L, A const& R) { return &L == &R; }
  36
  37 int main(int, char**) {
  38     A a;
  39
  40   return 0;
  41 }