ceph/src/boost/libs/core/test/exchange_test.cpp

   1 /*
   2 Copyright 2018 Glen Joseph Fernandes
   3 (glenjofe@gmail.com)
   4
   5 Distributed under the Boost Software License, Version 1.0.
   6 (http://www.boost.org/LICENSE_1_0.txt)
   7 */
   8 #include <boost/core/exchange.hpp>
   9 #include <boost/core/lightweight_test.hpp>
  10
  11 void test1()
  12 {
  13     int i = 1;
  14     BOOST_TEST(boost::exchange(i, 2) == 1);
  15     BOOST_TEST(i == 2);
  16 }
  17
  18 class C1 {
  19 public:
  20     explicit C1(int i)
  21         : i_(i) { }
  22     int i() const {
  23         return i_;
  24     }
  25 private:
  26     int i_;
  27 };
  28
  29 void test2()
  30 {
  31     C1 x(1);
  32     BOOST_TEST(boost::exchange(x, C1(2)).i() == 1);
  33     BOOST_TEST(x.i() == 2);
  34 }
  35
  36 class C2 {
  37 public:
  38     explicit C2(int i)
  39         : i_(i) { }
  40     operator C1() const {
  41         return C1(i_);
  42     }
  43     int i() const {
  44         return i_;
  45     }
  46 private:
  47     int i_;
  48 };
  49
  50 void test3()
  51 {
  52     C1 x(1);
  53     BOOST_TEST(boost::exchange(x, C2(2)).i() == 1);
  54     BOOST_TEST(x.i() == 2);
  55 }
  56
  57 class C3 {
  58 public:
  59     explicit C3(int i)
  60         : i_(i) { }
  61     C3(const C3& c)
  62         : i_(c.i_) { }
  63     C3& operator=(const C1& c) {
  64         i_ = c.i();
  65         return *this;
  66     }
  67     int i() const {
  68         return i_;
  69     }
  70 private:
  71     C3& operator=(const C3&);
  72     int i_;
  73 };
  74
  75 void test4()
  76 {
  77     C3 x(1);
  78     BOOST_TEST(boost::exchange(x, C1(2)).i() == 1);
  79     BOOST_TEST(x.i() == 2);
  80 }
  81
  82 int main()
  83 {
  84     test1();
  85     test2();
  86     test3();
  87     test4();
  88     return boost::report_errors();
  89 }