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1 | // |
2 | // Copyright 2014 Peter Dimov | |
3 | // | |
4 | // Distributed under the Boost Software License, Version 1.0. | |
5 | // See accompanying file LICENSE_1_0.txt or copy at | |
6 | // http://www.boost.org/LICENSE_1_0.txt | |
7 | // | |
8 | ||
9 | #include <boost/generator_iterator.hpp> | |
10 | #include <boost/detail/lightweight_test.hpp> | |
11 | #include <algorithm> | |
12 | ||
13 | class X | |
14 | { | |
15 | private: | |
16 | ||
17 | int v; | |
18 | ||
19 | public: | |
20 | ||
21 | typedef int result_type; | |
22 | ||
23 | X(): v( 0 ) | |
24 | { | |
25 | } | |
26 | ||
27 | int operator()() | |
28 | { | |
29 | return ++v; | |
30 | } | |
31 | }; | |
32 | ||
33 | template<class InputIterator, class Size, class OutputIterator> OutputIterator copy_n( InputIterator first, Size n, OutputIterator result ) | |
34 | { | |
35 | while( n-- > 0 ) | |
36 | { | |
37 | *result++ = *first++; | |
38 | } | |
39 | ||
40 | return result; | |
41 | } | |
42 | ||
43 | void copy_test() | |
44 | { | |
45 | X x; | |
46 | boost::generator_iterator<X> in( &x ); | |
47 | ||
48 | int const N = 4; | |
49 | int v[ N ] = { 0 }; | |
50 | ||
51 | ::copy_n( in, 4, v ); | |
52 | ||
53 | BOOST_TEST_EQ( v[0], 1 ); | |
54 | BOOST_TEST_EQ( v[1], 2 ); | |
55 | BOOST_TEST_EQ( v[2], 3 ); | |
56 | BOOST_TEST_EQ( v[3], 4 ); | |
57 | } | |
58 | ||
59 | int main() | |
60 | { | |
61 | copy_test(); | |
62 | return boost::report_errors(); | |
63 | } |