libcxx/test/std/utilities/function.objects/func.memfn/robust_against_adl.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // <functional>
  10
  11 #include <functional>
  12
  13 #include "test_macros.h"
  14
  15 struct Incomplete;
  16 template<class T> struct Holder { T t; };
  17 typedef Holder<Incomplete> *Ptr;
  18
  19 struct A {
  20     Ptr no_args() const { return nullptr; }
  21     Ptr one_arg(Ptr p) const { return p; }
  22     void one_arg_void(Ptr) const { }
  23 };
  24
  25 int main(int, char**)
  26 {
  27     A a;
  28     A *pa = &a;
  29     const A *cpa = &a;
  30     Ptr x = nullptr;
  31     const Ptr cx = nullptr;
  32     std::mem_fn(&A::no_args)(a);
  33     std::mem_fn(&A::no_args)(pa);
  34     std::mem_fn(&A::no_args)(*cpa);
  35     std::mem_fn(&A::no_args)(cpa);
  36     std::mem_fn(&A::one_arg)(a, x);
  37     std::mem_fn(&A::one_arg)(pa, x);
  38     std::mem_fn(&A::one_arg)(a, cx);
  39     std::mem_fn(&A::one_arg)(pa, cx);
  40     std::mem_fn(&A::one_arg)(*cpa, x);
  41     std::mem_fn(&A::one_arg)(cpa, x);
  42     std::mem_fn(&A::one_arg)(*cpa, cx);
  43     std::mem_fn(&A::one_arg)(cpa, cx);
  44     std::mem_fn(&A::one_arg_void)(a, x);
  45     std::mem_fn(&A::one_arg_void)(pa, x);
  46     std::mem_fn(&A::one_arg_void)(a, cx);
  47     std::mem_fn(&A::one_arg_void)(pa, cx);
  48     std::mem_fn(&A::one_arg_void)(*cpa, x);
  49     std::mem_fn(&A::one_arg_void)(cpa, x);
  50     std::mem_fn(&A::one_arg_void)(*cpa, cx);
  51     std::mem_fn(&A::one_arg_void)(cpa, cx);
  52     return 0;
  53 }