1 | // phoenix_style_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 | |
15 | #include <boost/core/lightweight_test.hpp> |
16 | #define BOOST_CHECK BOOST_TEST |
17 | |
18 | #include "boost/lambda/lambda.hpp" |
19 | #include "boost/lambda/if.hpp" |
20 | #include "boost/lambda/loops.hpp" |
21 | |
22 | #include <iostream> |
23 | #include <vector> |
24 | #include <list> |
25 | #include <algorithm> |
26 | #include <cmath> |
27 | #include <cassert> |
28 | #include <functional> |
29 | |
30 | |
31 | |
32 | using namespace boost::lambda; |
33 | using namespace std; |
34 | |
35 | |
36 | |
37 | // If-else, while, do-while, for statements |
38 | |
39 | |
40 | int main() { |
41 | |
42 | vector<int> v; |
43 | v.clear(); |
44 | v.push_back(x: 1); |
45 | v.push_back(x: 2); |
46 | v.push_back(x: 3); |
47 | v.push_back(x: 4); |
48 | v.push_back(x: 5); |
49 | v.push_back(x: 6); |
50 | v.push_back(x: 7); |
51 | v.push_back(x: 8); |
52 | v.push_back(x: 9); |
53 | v.push_back(x: 10); |
54 | |
55 | int sum = 0; |
56 | ////////////////////////////////// |
57 | for_each(first: v.begin(), last: v.end(), |
58 | f: if_(cond: _1 > 3 && _1 <= 8) |
59 | [ |
60 | sum += _1 |
61 | ] |
62 | ); |
63 | |
64 | BOOST_CHECK(sum == 4+5+6+7+8); |
65 | |
66 | int gt = 0, eq = 0, lt = 0; |
67 | ////////////////////////////////// |
68 | for_each(first: v.begin(), last: v.end(), |
69 | f: if_(cond: _1 > 5) |
70 | [ |
71 | ++var(t&: gt) |
72 | ] |
73 | .else_ |
74 | [ |
75 | if_(cond: _1 == 5) |
76 | [ |
77 | ++var(t&: eq) |
78 | ] |
79 | .else_ |
80 | [ |
81 | ++var(t&: lt) |
82 | ] |
83 | ] |
84 | ); |
85 | |
86 | BOOST_CHECK(lt==4); |
87 | BOOST_CHECK(eq==1); |
88 | BOOST_CHECK(gt==5); |
89 | |
90 | vector<int> t = v; |
91 | |
92 | int counta = 0; |
93 | int countb = 0; |
94 | ////////////////////////////////// |
95 | for_each(first: v.begin(), last: v.end(), |
96 | f: ( |
97 | while_(cond: _1--) |
98 | [ |
99 | ++var(t&: counta) |
100 | ], |
101 | ++var(t&: countb) |
102 | ) |
103 | ); |
104 | |
105 | BOOST_CHECK(counta == 55); |
106 | BOOST_CHECK(countb == 10); |
107 | |
108 | |
109 | v = t; |
110 | |
111 | counta = 0; countb = 0; |
112 | ////////////////////////////////// |
113 | for_each(first: v.begin(), last: v.end(), |
114 | f: ( |
115 | do_ |
116 | [ |
117 | ++var(t&: counta) |
118 | ] |
119 | .while_(cond: _1--), |
120 | ++var(t&: countb) |
121 | ) |
122 | ); |
123 | |
124 | BOOST_CHECK(counta == (2+11)*10/2); |
125 | BOOST_CHECK(countb == 10); |
126 | |
127 | |
128 | v = t; |
129 | counta = 0; countb = 0; |
130 | ////////////////////////////////// |
131 | int iii; |
132 | for_each(first: v.begin(), last: v.end(), |
133 | f: ( |
134 | for_(init: var(t&: iii) = 0, cond: var(t&: iii) < _1, step: ++var(t&: iii)) |
135 | [ |
136 | ++var(t&: counta) |
137 | ], |
138 | ++var(t&: countb) |
139 | ) |
140 | ); |
141 | |
142 | BOOST_CHECK(counta == (1+10)*10/2); |
143 | BOOST_CHECK(countb == 10); |
144 | |
145 | v = t; |
146 | |
147 | return boost::report_errors(); |
148 | } |
149 | |