// 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();

}