64 lines
1021 B
C++
64 lines
1021 B
C++
//
|
|
// Copyright 2014 Peter Dimov
|
|
//
|
|
// 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/generator_iterator.hpp>
|
|
#include <boost/detail/lightweight_test.hpp>
|
|
#include <algorithm>
|
|
|
|
class X
|
|
{
|
|
private:
|
|
|
|
int v;
|
|
|
|
public:
|
|
|
|
typedef int result_type;
|
|
|
|
X(): v( 0 )
|
|
{
|
|
}
|
|
|
|
int operator()()
|
|
{
|
|
return ++v;
|
|
}
|
|
};
|
|
|
|
template<class InputIterator, class Size, class OutputIterator> OutputIterator copy_n( InputIterator first, Size n, OutputIterator result )
|
|
{
|
|
while( n-- > 0 )
|
|
{
|
|
*result++ = *first++;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
void copy_test()
|
|
{
|
|
X x;
|
|
boost::generator_iterator<X> in( &x );
|
|
|
|
int const N = 4;
|
|
int v[ N ] = { 0 };
|
|
|
|
::copy_n( in, 4, v );
|
|
|
|
BOOST_TEST_EQ( v[0], 1 );
|
|
BOOST_TEST_EQ( v[1], 2 );
|
|
BOOST_TEST_EQ( v[2], 3 );
|
|
BOOST_TEST_EQ( v[3], 4 );
|
|
}
|
|
|
|
int main()
|
|
{
|
|
copy_test();
|
|
return boost::report_errors();
|
|
}
|