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 // <unordered_set> 11 12 // Check that std::unordered_set fails to instantiate if the comparison predicate is 13 // not copy-constructible. This is LWG issue 2436 14 15 #include <unordered_set> 16 17 template <class T> 18 struct Comp { 19 bool operator () (const T& lhs, const T& rhs) const { return lhs == rhs; } 20 21 Comp () {} 22 private: 23 Comp (const Comp &); // declared but not defined 24 }; 25 26 27 int main() { 28 std::unordered_set<int, std::hash<int>, Comp<int> > m; 29 } 30
