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      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 // template <class Value, class Hash = hash<Value>, class Pred = equal_to<Value>,
     13 //           class Alloc = allocator<Value>>
     14 // class unordered_set
     15 
     16 // void swap(unordered_set& x, unordered_set& y);
     17 
     18 #if _LIBCPP_DEBUG >= 1
     19 #define _LIBCPP_ASSERT(x, m) ((x) ? (void)0 : std::exit(0))
     20 #endif
     21 
     22 #include <unordered_set>
     23 #include <cassert>
     24 
     25 int main()
     26 {
     27 #if _LIBCPP_DEBUG >= 1
     28     {
     29         int a1[] = {1, 3, 7, 9, 10};
     30         int a2[] = {0, 2, 4, 5, 6, 8, 11};
     31         std::unordered_set<int> c1(a1, a1+sizeof(a1)/sizeof(a1[0]));
     32         std::unordered_set<int> c2(a2, a2+sizeof(a2)/sizeof(a2[0]));
     33         std::unordered_set<int>::iterator i1 = c1.begin();
     34         std::unordered_set<int>::iterator i2 = c2.begin();
     35         swap(c1, c2);
     36         c1.erase(i2);
     37         c2.erase(i1);
     38         std::unordered_set<int>::iterator j = i1;
     39         c1.erase(i1);
     40         assert(false);
     41     }
     42 #endif
     43 }
     44