1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
// Copyright 2022 (c) Andrey Semashev
// Distributed under the Boost Software License Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include <boost/config.hpp>
#include <boost/core/lightweight_test.hpp>
#include <boost/iterator/function_output_iterator.hpp>
namespace {
struct sum_func
{
typedef void result_type;
explicit sum_func(int& n) : m_n(n) {}
result_type operator() (int x) const
{
m_n += x;
}
private:
int& m_n;
};
} // namespace
int main()
{
{
int n = 0;
boost::iterators::function_output_iterator< sum_func > it =
boost::iterators::make_function_output_iterator(sum_func(n));
*it = 1;
++it;
*it = 2;
++it;
*it = 3;
BOOST_TEST_EQ(n, 6);
}
#if !defined(BOOST_NO_CXX11_LAMBDAS) && !defined(BOOST_NO_CXX11_AUTO_DECLARATIONS)
{
int n = 0;
auto it = boost::iterators::make_function_output_iterator([&n](int x) { n -= x; });
*it = 1;
++it;
*it = 2;
++it;
*it = 3;
BOOST_TEST_EQ(n, -6);
}
#endif
return boost::report_errors();
}
|
