libcxx/test/std/utilities/function.objects/func.memfn/member_function_volatile.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 // template<Returnable R, class T, CopyConstructible... Args>
  12 //   unspecified mem_fn(R (T::* pm)(Args...) volatile);
  13
  14 #include <functional>
  15 #include <cassert>
  16
  17 #include "test_macros.h"
  18
  19 struct A
  20 {
  21     char test0() volatile {return 'a';}
  22     char test1(int) volatile {return 'b';}
  23     char test2(int, double) volatile {return 'c';}
  24 };
  25
  26 template <class F>
  27 void
  28 test0(F f)
  29 {
  30     {
  31     A a;
  32     assert(f(a) == 'a');
  33     A* ap = &a;
  34     assert(f(ap) == 'a');
  35     volatile A* cap = &a;
  36     assert(f(cap) == 'a');
  37     const F& cf = f;
  38     assert(cf(ap) == 'a');
  39     }
  40 }
  41
  42 template <class F>
  43 void
  44 test1(F f)
  45 {
  46     {
  47     A a;
  48     assert(f(a, 1) == 'b');
  49     A* ap = &a;
  50     assert(f(ap, 2) == 'b');
  51     volatile A* cap = &a;
  52     assert(f(cap, 2) == 'b');
  53     const F& cf = f;
  54     assert(cf(ap, 2) == 'b');
  55     }
  56 }
  57
  58 template <class F>
  59 void
  60 test2(F f)
  61 {
  62     {
  63     A a;
  64     assert(f(a, 1, 2) == 'c');
  65     A* ap = &a;
  66     assert(f(ap, 2, 3.5) == 'c');
  67     volatile A* cap = &a;
  68     assert(f(cap, 2, 3.5) == 'c');
  69     const F& cf = f;
  70     assert(cf(ap, 2, 3.5) == 'c');
  71     }
  72 }
  73
  74 int main(int, char**)
  75 {
  76     test0(std::mem_fn(&A::test0));
  77     test1(std::mem_fn(&A::test1));
  78     test2(std::mem_fn(&A::test2));
  79
  80   return 0;
  81 }