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 // The test requires access control SFINAE. 12 13 // <unordered_map> 14 15 // Check that std::unordered_map fails to instantiate if the hash function is 16 // not copy-constructible. This is mentioned in LWG issue 2436 17 18 #include <unordered_map> 19 20 template <class T> 21 struct Hash { 22 std::size_t operator () (const T& lhs) const { return 0; } 23 24 Hash () {} 25 private: 26 Hash (const Hash &); // declared but not defined 27 }; 28 29 30 int main() { 31 std::unordered_map<int, int, Hash<int> > m; 32 } 33
