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/* Copyright (c) 1997-2024
Ewgenij Gawrilow, Michael Joswig, and the polymake team
Technische Universität Berlin, Germany
https://polymake.org
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version: http://www.gnu.org/licenses/gpl.txt.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
--------------------------------------------------------------------------------
*/
#pragma once
#include "polymake/GenericSet.h"
#include "polymake/internal/iterator_filters.h"
namespace pm {
template <typename ContainerRef, typename Predicate>
class SelectedSubset
: public modified_container_base<ContainerRef, Predicate>
, public modified_container_impl< SelectedSubset<ContainerRef, Predicate>,
mlist< ContainerRefTag< ContainerRef >,
OperationTag< Predicate >,
IteratorConstructorTag< unary_predicate_selector_constructor > > >
, public generic_of_subset_t<SelectedSubset<ContainerRef, Predicate>, typename deref<ContainerRef>::type> {
using base_t = modified_container_base<ContainerRef, Predicate>;
using impl_t = modified_container_impl<SelectedSubset>;
public:
using container_category = typename least_derived_class<bidirectional_iterator_tag, typename impl_t::container_category>::type;
using modified_container_base<ContainerRef, Predicate>::modified_container_base;
using base_t::get_operation;
};
template <typename ContainerRef, typename Predicate>
class TruncatedContainer
: public modified_container_base<ContainerRef, Predicate>
, public modified_container_impl< TruncatedContainer<ContainerRef, Predicate>,
mlist< ContainerRefTag< ContainerRef >,
OperationTag< Predicate >,
IteratorConstructorTag< input_truncator_constructor > > >
, public generic_of_subset_t<TruncatedContainer<ContainerRef, Predicate>, typename deref<ContainerRef>::type> {
using base_t = modified_container_base<ContainerRef, Predicate>;
using impl_t = modified_container_impl<TruncatedContainer>;
public:
using container_category = forward_iterator_tag;
using modified_container_base<ContainerRef, Predicate>::modified_container_base;
using base_t::get_operation;
decltype(auto) front()
{
return this->get_container().front();
}
decltype(auto) front() const
{
return this->get_container().front();
}
};
template <typename ContainerRef, typename Predicate>
class ContractedRanges
: public modified_container_base<ContainerRef, Predicate>
, public modified_container_impl< ContractedRanges<ContainerRef, Predicate>,
mlist< ContainerRefTag< ContainerRef >,
OperationTag< Predicate >,
IteratorConstructorTag< range_contractor_constructor > > > {
using base_t = modified_container_base<ContainerRef, Predicate>;
public:
using container_category = forward_iterator_tag;
using modified_container_base<ContainerRef, Predicate>::modified_container_base;
using base_t::get_operation;
};
template <typename ContainerRef, typename FoldingOperation>
class FoldedRanges
: public modified_container_base<ContainerRef, FoldingOperation>
, public modified_container_impl< FoldedRanges<ContainerRef, FoldingOperation>,
mlist< ContainerRefTag< ContainerRef >,
OperationTag< FoldingOperation >,
IteratorConstructorTag< range_folder_constructor > > > {
using base_t = modified_container_base<ContainerRef, FoldingOperation>;
public:
using container_category = forward_iterator_tag;
using modified_container_base<ContainerRef, FoldingOperation>::modified_container_base;
using base_t::get_operation;
};
template <typename ContainerRef, typename Predicate>
struct spec_object_traits< SelectedSubset<ContainerRef, Predicate> > :
spec_object_traits<is_container> {
static constexpr bool
is_temporary = true,
is_always_const = is_effectively_const<ContainerRef>::value;
};
template <typename ContainerRef, typename Predicate>
struct spec_object_traits< TruncatedContainer<ContainerRef, Predicate> > :
spec_object_traits<is_container> {
static constexpr bool
is_temporary = true,
is_always_const = is_effectively_const<ContainerRef>::value;
};
template <typename ContainerRef, typename Predicate>
struct spec_object_traits< ContractedRanges<ContainerRef, Predicate> > :
spec_object_traits<is_container> {
static constexpr bool is_temporary = true, is_always_const = true;
};
template <typename ContainerRef, typename FoldingOperation>
struct spec_object_traits< FoldedRanges<ContainerRef, FoldingOperation> > :
spec_object_traits<is_container> {
static constexpr bool is_temporary = true, is_always_const = true;
};
class index_truncator {
protected:
Int last;
public:
index_truncator(Int l = -1) : last(l) {}
typedef void argument_type;
typedef bool result_type;
template <typename Iterator>
bool operator() (const Iterator& it) const
{
return it.index() <= last;
}
};
class equal_index_folder {
public:
typedef void argument_type;
typedef Int value_type;
typedef const Int& reference;
template <typename Iterator>
void reset(const Iterator& it)
{
cnt = 1;
index = it.index();
}
template <typename Iterator>
bool operator() (const Iterator& it)
{
if (it.index() == index) {
++cnt;
return true;
} else {
return false;
}
}
const Int& get() const { return cnt; }
Int get_index() const { return index; }
private:
Int index;
Int cnt;
};
template <typename Container, typename Predicate>
auto attach_selector(Container&& c, const Predicate& pred)
{
return SelectedSubset<Container, Predicate>(std::forward<Container>(c), pred);
}
template <typename Container, typename Predicate>
auto attach_truncator(Container&& c, const Predicate& pred)
{
return TruncatedContainer<Container, Predicate>(std::forward<Container>(c), pred);
}
template <typename Container, typename Predicate>
auto contract_ranges(Container&& c, const Predicate& pred)
{
return ContractedRanges<add_const_t<Container>, Predicate>(std::forward<Container>(c), pred);
}
template <typename Container>
auto contract_equal_ranges(Container&& c)
{
return ContractedRanges<add_const_t<Container>, BuildBinary<operations::eq> >(std::forward<Container>(c));
}
template <typename Container, typename Operation>
auto fold_ranges(Container&& c, const Operation& op)
{
return FoldedRanges<add_const_t<Container>, Operation>(std::forward<Container>(c), op);
}
template <typename ContainerRef1, typename ContainerRef2, typename Predicate>
class SelectedContainerPairSubset
: public modified_container_pair_base<ContainerRef1, ContainerRef2, Predicate>
, public modified_container_pair_impl< SelectedContainerPairSubset<ContainerRef1, ContainerRef2, Predicate>,
mlist< Container1RefTag< ContainerRef1 >,
Container2RefTag< ContainerRef2 >,
IteratorConstructorTag< binary_predicate_selector_constructor >,
OperationTag< Predicate > > >
, public generic_of_subset_t<SelectedContainerPairSubset<ContainerRef1, ContainerRef2, Predicate>, typename deref<ContainerRef1>::type > {
using base_t = modified_container_pair_base<ContainerRef1, ContainerRef2, Predicate>;
using impl_t = modified_container_pair_impl<SelectedContainerPairSubset>;
public:
using container_category = typename least_derived_class<bidirectional_iterator_tag, typename impl_t::container_category>::type;
using modified_container_pair_base<ContainerRef1, ContainerRef2, Predicate>::modified_container_pair_base;
using base_t::get_operation;
};
template <typename ContainerRef1, typename ContainerRef2, typename Predicate>
struct spec_object_traits< SelectedContainerPairSubset<ContainerRef1, ContainerRef2, Predicate> >
: spec_object_traits<is_container> {
static constexpr bool
is_temporary = true,
is_always_const = is_effectively_const<ContainerRef1>::value;
};
template <typename Container1, typename Container2, typename Predicate>
auto attach_selector(Container1&& c1, Container2&& c2, const Predicate& pred)
{
return SelectedContainerPairSubset<Container1, Container2, Predicate>
(std::forward<Container1>(c1), std::forward<Container2>(c2), pred);
}
template <typename Container1, typename Container2>
auto attach_mask(Container1&& data, Container2&& boolean)
{
return SelectedContainerPairSubset<Container1, add_const_t<Container2>, operations::apply2< BuildUnaryIt<operations::dereference> > >
(std::forward<Container1>(data), std::forward<Container2>(boolean));
}
} // end namespace pm
namespace polymake {
using pm::SelectedSubset;
using pm::TruncatedContainer;
using pm::ContractedRanges;
using pm::FoldedRanges;
using pm::SelectedContainerPairSubset;
using pm::attach_selector;
using pm::attach_mask;
using pm::contract_ranges;
using pm::contract_equal_ranges;
using pm::fold_ranges;
} // end namespace polymake
// Local Variables:
// mode:C++
// c-basic-offset:3
// indent-tabs-mode:nil
// End:
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