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1 | // |
2 | // Copyright (c) 2013-2017 Vinnie Falco (vinnie dot falco at gmail dot com) | |
3 | // | |
4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
6 | // | |
7 | ||
8 | // Test that header file is self-contained. | |
9 | #include <beast/core/detail/empty_base_optimization.hpp> | |
10 | ||
11 | #include <beast/unit_test/suite.hpp> | |
12 | ||
13 | namespace beast { | |
14 | namespace detail { | |
15 | ||
16 | class empty_base_optimization_test | |
17 | : public beast::unit_test::suite | |
18 | { | |
19 | public: | |
20 | template<class T> | |
21 | class test1 | |
22 | : private empty_base_optimization<T> | |
23 | { | |
24 | using Base = empty_base_optimization<T>; | |
25 | void* m_p; | |
26 | public: | |
27 | explicit test1 (T const& t) | |
28 | : Base (t) | |
29 | {} | |
30 | ||
31 | T& member() {return Base::member();} | |
32 | T const& member() const {return Base::member();} | |
33 | }; | |
34 | ||
35 | template<class T> | |
36 | class test2 | |
37 | { | |
38 | void* m_p; | |
39 | T m_t; | |
40 | public: | |
41 | explicit test2 (T const& t) | |
42 | : m_t (t) | |
43 | {} | |
44 | ||
45 | T& member() {return m_t;} | |
46 | T const& member() const {return m_t;} | |
47 | }; | |
48 | ||
49 | struct Empty | |
50 | { | |
51 | operator bool() {return true;} | |
52 | }; | |
53 | ||
54 | static | |
55 | bool | |
56 | test_one() | |
57 | { | |
58 | test1<int> t1(1); | |
59 | test2<int> t2(2); | |
60 | static_assert(sizeof(t1) == sizeof(t2), "don't optimize for int"); | |
61 | if(t1.member() != 1) | |
62 | return false; | |
63 | if(t2.member() != 2) | |
64 | return false; | |
65 | return true; | |
66 | } | |
67 | ||
68 | static | |
69 | bool | |
70 | test_two() | |
71 | { | |
72 | test1<Empty> t1((Empty())); | |
73 | test2<Empty> t2((Empty())); | |
74 | static_assert(sizeof(t1) < sizeof(t2), "do optimize for Empty"); | |
75 | if(t1.member() != true) | |
76 | return false; | |
77 | if(t2.member() != true) | |
78 | return false; | |
79 | return true; | |
80 | } | |
81 | ||
82 | void | |
83 | run() | |
84 | { | |
85 | BEAST_EXPECT(test_one()); | |
86 | BEAST_EXPECT(test_two()); | |
87 | pass(); | |
88 | } | |
89 | }; | |
90 | ||
91 | BEAST_DEFINE_TESTSUITE(empty_base_optimization,core,beast); | |
92 | ||
93 | } // detail | |
94 | } // beast |