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/// \file
// Range v3 library
//
// Copyright Andrey Diduh 2019
//
// Use, modification and distribution is subject to 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)
//
// Project home: https://github.com/ericniebler/range-v3
//
#include "../simple_test.hpp"
#include "../test_utils.hpp"
#include <type_traits>
#include <vector>
#include <list>
#include <forward_list>
#include <range/v3/view/drop_last.hpp>
#include <range/v3/view/take_exactly.hpp>
#include <range/v3/view/transform.hpp>
#include <range/v3/view/generate_n.hpp>
using namespace ranges;
template<class Rng>
struct view_non_const_only
: view_adaptor<view_non_const_only<Rng>, Rng>
{
private:
friend range_access;
adaptor_base begin_adaptor() { return {}; }
adaptor_base end_adaptor() { return {}; }
public:
using view_non_const_only::view_adaptor::view_adaptor;
CPP_auto_member
auto CPP_fun(size)() (
requires sized_range<Rng>)
{
return ranges::size(this->base());
}
};
template<class Rng>
view_non_const_only<views::all_t<Rng>> non_const_only(Rng &&rng)
{
return view_non_const_only<views::all_t<Rng>>{views::all(static_cast<Rng&&>(rng))};
}
template<class Rng>
void test_range(Rng&& src)
{
// additional src copy for InputStream
{
auto src_ = src;
::check_equal(src_, {1,2,3,4});
}
{
auto src_ = src;
auto list = src_ | views::drop_last(2);
::check_equal(list, {1,2});
}
{
auto src_ = src;
auto list = src_ | views::drop_last(0);
::check_equal(list, {1,2,3,4});
}
{
auto src_ = src;
auto list = src_ | views::drop_last(4);
CHECK(list.empty());
}
{
auto src_ = src;
auto list = src_ | views::drop_last(5);
CHECK(list.empty());
}
}
template<class Rng>
void test_size(Rng&& src)
{
CHECK( (src | views::drop_last(0)).size() == std::size_t(4) );
CHECK( (src | views::drop_last(2)).size() == std::size_t(2) );
CHECK( (src | views::drop_last(4)).size() == std::size_t(0) );
CHECK( (src | views::drop_last(5)).size() == std::size_t(0) );
}
template<class Rng>
void test_non_convert_range(Rng&& src)
{
// test non-convertible const<=>non-const range
test_range(src | views::transform([](const int& i) -> const int& {return i;}));
}
void random_acccess_test()
{
using Src = std::vector<int>;
static_assert(
ranges::random_access_range<Src>
, "Must be exactly RA.");
static_assert(
std::is_same<
drop_last_view<views::all_t<Src&>>,
drop_last_view<views::all_t<Src&>, detail::drop_last_view::mode_bidi>
>::value
, "Must have correct view.");
Src src = {1,2,3,4};
test_range(src);
test_range(non_const_only(src));
test_size(src);
test_non_convert_range(src);
}
void bidirectional_test()
{
using Src = std::list<int>;
static_assert(
!ranges::random_access_range<Src> &&
ranges::bidirectional_range<Src>
, "Must be exactly bidirectional.");
static_assert(
std::is_same<
/* mode_sized for max_performance profile.
* mode_bidi for compatible profile.
* See aux::drop_last::get_mode */
drop_last_view<views::all_t<Src&>>,
drop_last_view<views::all_t<Src&>, detail::drop_last_view::mode_bidi>
>::value
, "Must have correct view.");
Src src = {1,2,3,4};
test_range(src);
test_range(non_const_only(src));
test_size(src);
test_non_convert_range(src);
}
void forward_test()
{
using Src = std::forward_list<int>;
static_assert(
!ranges::bidirectional_range<Src> &&
ranges::forward_range<Src>
, "Must be exactly forward.");
static_assert(
std::is_same<
drop_last_view<views::all_t<Src&>>,
drop_last_view<views::all_t<Src&>, detail::drop_last_view::mode_forward>
>::value
, "Must have correct view.");
Src src = {1,2,3,4};
test_range(src);
test_range(non_const_only(src));
test_size(src | views::take_exactly(4));
test_non_convert_range(src);
}
void sized_test()
{
int i = 0;
auto src = views::generate_n([i]() mutable -> int { return ++i;}, 4);
using Src = decltype(src);
static_assert(
!ranges::forward_range<Src> &&
ranges::input_range<Src>
, "Must be exactly input.");
static_assert(
std::is_same<
drop_last_view<views::all_t<Src>>,
drop_last_view<views::all_t<Src>, detail::drop_last_view::mode_sized>
>::value
, "Must have correct view.");
{
// always non-const
auto src_ = src;
test_range(src_);
}
{
auto src_ = src;
test_size(src_);
}
{
auto src_ = src;
test_range(non_const_only(std::move(src_)));
}
{
auto src_ = src;
test_non_convert_range(src_);
}
}
int main()
{
random_acccess_test();
bidirectional_test();
forward_test();
sized_test();
return test_result();
}
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