| 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 | } |
| 90 |