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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 // <functional>
     11 
     12 // template<Returnable S, ClassType T, CopyConstructible A>
     13 //   mem_fun1_ref_t<S,T,A>
     14 //   mem_fun_ref(S (T::*f)(A));
     15 
     16 #include <functional>
     17 #include <cassert>
     18 
     19 struct A
     20 {
     21     char a1() {return 5;}
     22     short a2(int i) {return short(i+1);}
     23     int a3() const {return 1;}
     24     double a4(unsigned i) const {return i-1;}
     25 };
     26 
     27 int main()
     28 {
     29     A a;
     30     assert(std::mem_fun_ref(&A::a2)(a, 5) == 6);
     31 }
     32