| 1 | /*============================================================================= |
|---|---|
| 2 | Copyright (c) 2017 Paul Fultz II |
| 3 | issue8.cpp |
| 4 | Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 5 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| 6 | ==============================================================================*/ |
| 7 | |
| 8 | #include "test.hpp" |
| 9 | #include <vector> |
| 10 | #include <boost/hof/pipable.hpp> |
| 11 | #include <boost/hof/placeholders.hpp> |
| 12 | #include <algorithm> |
| 13 | |
| 14 | |
| 15 | struct filter_fn |
| 16 | { |
| 17 | template<class Input, class P> |
| 18 | Input operator()(Input input, P pred) const |
| 19 | { |
| 20 | Input output(input.size()); |
| 21 | output.erase( |
| 22 | ::std::copy_if( |
| 23 | ::std::begin(input), |
| 24 | ::std::end(input), |
| 25 | ::std::begin(output), |
| 26 | pred |
| 27 | ), |
| 28 | ::std::end(output) |
| 29 | ); |
| 30 | return output; |
| 31 | } |
| 32 | }; |
| 33 | |
| 34 | static constexpr boost::hof::pipable_adaptor<filter_fn> filter = {}; |
| 35 | |
| 36 | BOOST_HOF_TEST_CASE() |
| 37 | { |
| 38 | std::vector<int> data; |
| 39 | for(int i=0;i<6;i++) |
| 40 | { |
| 41 | data.push_back(x: i); |
| 42 | } |
| 43 | std::vector<int> r1 = data | filter(boost::hof::_1 > 1); |
| 44 | BOOST_HOF_TEST_CHECK(r1.size() == 4); |
| 45 | |
| 46 | std::vector<int> r2 = filter(data, boost::hof::_1 > 1); |
| 47 | BOOST_HOF_TEST_CHECK(r2.size() == 4); |
| 48 | } |
| 49 |