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1 | // -- control_structures.cpp -- The Boost Lambda Library ------------------ |
2 | // | |
3 | // Copyright (C) 2000-2003 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi) | |
4 | // Copyright (C) 2000-2003 Gary Powell (powellg@amazon.com) | |
5 | // | |
6 | // Distributed under the Boost Software License, Version 1.0. (See | |
7 | // accompanying file LICENSE_1_0.txt or copy at | |
8 | // http://www.boost.org/LICENSE_1_0.txt) | |
9 | // | |
10 | // For more information, see www.boost.org | |
11 | ||
12 | // ----------------------------------------------------------------------- | |
13 | ||
14 | #include <boost/test/minimal.hpp> // see "Header Implementation Option" | |
15 | ||
16 | #include "boost/lambda/lambda.hpp" | |
17 | #include "boost/lambda/if.hpp" | |
18 | #include "boost/lambda/loops.hpp" | |
19 | ||
20 | #include <iostream> | |
21 | #include <algorithm> | |
22 | #include <vector> | |
23 | ||
24 | using namespace boost; | |
25 | ||
26 | using boost::lambda::constant; | |
27 | using boost::lambda::_1; | |
28 | using boost::lambda::_2; | |
29 | using boost::lambda::_3; | |
30 | using boost::lambda::make_const; | |
31 | using boost::lambda::for_loop; | |
32 | using boost::lambda::while_loop; | |
33 | using boost::lambda::do_while_loop; | |
34 | using boost::lambda::if_then; | |
35 | using boost::lambda::if_then_else; | |
36 | using boost::lambda::if_then_else_return; | |
37 | ||
38 | // 2 container for_each | |
39 | template <class InputIter1, class InputIter2, class Function> | |
40 | Function for_each(InputIter1 first, InputIter1 last, | |
41 | InputIter2 first2, Function f) { | |
42 | for ( ; first != last; ++first, ++first2) | |
43 | f(*first, *first2); | |
44 | return f; | |
45 | } | |
46 | ||
47 | void simple_loops() { | |
48 | ||
49 | // for loops --------------------------------------------------------- | |
50 | int i; | |
51 | int arithmetic_series = 0; | |
52 | for_loop(_1 = 0, _1 < 10, _1++, arithmetic_series += _1)(i); | |
53 | BOOST_CHECK(arithmetic_series == 45); | |
54 | ||
55 | // no body case | |
56 | for_loop(boost::lambda::var(i) = 0, boost::lambda::var(i) < 100, ++boost::lambda::var(i))(); | |
57 | BOOST_CHECK(i == 100); | |
58 | ||
59 | // while loops ------------------------------------------------------- | |
60 | int a = 0, b = 0, c = 0; | |
61 | ||
62 | while_loop((_1 + _2) >= (_1 * _2), (++_1, ++_2, ++_3))(a, b, c); | |
63 | BOOST_CHECK(c == 3); | |
64 | ||
65 | int count; | |
66 | count = 0; i = 0; | |
67 | while_loop(_1++ < 10, ++boost::lambda::var(count))(i); | |
68 | BOOST_CHECK(count == 10); | |
69 | ||
70 | // note that the first parameter of do_while_loop is the condition | |
71 | count = 0; i = 0; | |
72 | do_while_loop(_1++ < 10, ++boost::lambda::var(count))(i); | |
73 | BOOST_CHECK(count == 11); | |
74 | ||
75 | a = 0; | |
76 | do_while_loop(constant(false), _1++)(a); | |
77 | BOOST_CHECK(a == 1); | |
78 | ||
79 | // no body cases | |
80 | a = 40; b = 30; | |
81 | while_loop(--_1 > _2)(a, b); | |
82 | BOOST_CHECK(a == b); | |
83 | ||
84 | // (the no body case for do_while_loop is pretty redundant) | |
85 | a = 40; b = 30; | |
86 | do_while_loop(--_1 > _2)(a, b); | |
87 | BOOST_CHECK(a == b); | |
88 | ||
89 | ||
90 | } | |
91 | ||
92 | void simple_ifs () { | |
93 | ||
94 | int value = 42; | |
95 | if_then(_1 < 0, _1 = 0)(value); | |
96 | BOOST_CHECK(value == 42); | |
97 | ||
98 | value = -42; | |
99 | if_then(_1 < 0, _1 = -_1)(value); | |
100 | BOOST_CHECK(value == 42); | |
101 | ||
102 | int min; | |
103 | if_then_else(_1 < _2, boost::lambda::var(min) = _1, boost::lambda::var(min) = _2) | |
104 | (make_const(1), make_const(2)); | |
105 | BOOST_CHECK(min == 1); | |
106 | ||
107 | if_then_else(_1 < _2, boost::lambda::var(min) = _1, boost::lambda::var(min) = _2) | |
108 | (make_const(5), make_const(3)); | |
109 | BOOST_CHECK(min == 3); | |
110 | ||
111 | int x, y; | |
112 | x = -1; y = 1; | |
113 | BOOST_CHECK(if_then_else_return(_1 < _2, _2, _1)(x, y) == (std::max)(x ,y)); | |
114 | BOOST_CHECK(if_then_else_return(_1 < _2, _2, _1)(y, x) == (std::max)(x ,y)); | |
115 | } | |
116 | ||
117 | ||
118 | int test_main(int, char *[]) | |
119 | { | |
120 | simple_loops(); | |
121 | simple_ifs(); | |
122 | return 0; | |
123 | } |