| 1 | /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 |
|---|---|
| 2 | // test_singleton.cpp |
| 3 | |
| 4 | // (C) Copyright 2018 Robert Ramey - http://www.rrsd.com . |
| 5 | // Use, modification and distribution is subject to the Boost Software |
| 6 | // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
| 7 | // http://www.boost.org/LICENSE_1_0.txt) |
| 8 | |
| 9 | // should pass compilation and execution |
| 10 | |
| 11 | #include <iostream> |
| 12 | #include <boost/serialization/singleton.hpp> |
| 13 | |
| 14 | #include "test_tools.hpp" |
| 15 | |
| 16 | static int i = 0; |
| 17 | |
| 18 | struct A { |
| 19 | int m_id; |
| 20 | A() : m_id(++i) {} |
| 21 | ~A(){ |
| 22 | // verify that objects are destroyed in sequence reverse of construction |
| 23 | if(i-- != m_id) std::terminate(); |
| 24 | } |
| 25 | }; |
| 26 | |
| 27 | struct B { |
| 28 | int m_id; |
| 29 | B() : m_id(++i) {} |
| 30 | ~B(){ |
| 31 | // verify that objects are destroyed in sequence reverse of construction |
| 32 | if(i-- != m_id) std::terminate(); |
| 33 | } |
| 34 | }; |
| 35 | |
| 36 | struct C { |
| 37 | int m_id; |
| 38 | C() : m_id(++i) {} |
| 39 | ~C(){ |
| 40 | // verify that objects are destroyed in sequence reverse of construction |
| 41 | if(i-- != m_id) std::terminate(); |
| 42 | } |
| 43 | }; |
| 44 | |
| 45 | struct D { |
| 46 | int m_id; |
| 47 | D(){ |
| 48 | // verify that only one object is indeed created |
| 49 | const C & c = boost::serialization::singleton<C>::get_const_instance(); |
| 50 | const C & c1 = boost::serialization::singleton<C>::get_const_instance(); |
| 51 | BOOST_CHECK_EQUAL(&c, &c1); |
| 52 | |
| 53 | // verify that objects are created in sequence of definition |
| 54 | BOOST_CHECK_EQUAL(c.m_id, 1); |
| 55 | const B & b = boost::serialization::singleton<B>::get_const_instance(); |
| 56 | BOOST_CHECK_EQUAL(b.m_id, 2); |
| 57 | const A & a = boost::serialization::singleton<A>::get_const_instance(); |
| 58 | BOOST_CHECK_EQUAL(a.m_id, 3); |
| 59 | std::cout << a.m_id << b.m_id << c.m_id << '\n'; |
| 60 | |
| 61 | m_id = ++i; |
| 62 | } |
| 63 | ~D(){ |
| 64 | // verify that objects are destroyed in sequence reverse of construction |
| 65 | if(i-- != m_id) std::terminate(); |
| 66 | } |
| 67 | }; |
| 68 | |
| 69 | int test_main(int, char *[]){ |
| 70 | return 0; |
| 71 | } |
| 72 | |
| 73 | // note: not a singleton |
| 74 | D d; |
| 75 |