/usr/include/polymake/internal/assoc.h is in libpolymake-dev-common 3.2r2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Ewgenij Gawrilow, Michael Joswig (Technische Universitaet Berlin, Germany)
http://www.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.
--------------------------------------------------------------------------------
*/
#ifndef POLYMAKE_INTERNAL_ASSOC_H
#define POLYMAKE_INTERNAL_ASSOC_H
#include <stdexcept>
#include "polymake/TransformedContainer.h"
#include "polymake/GenericSet.h"
namespace pm {
template <typename> struct DefaultValueTag;
/** Exception type
If an access operation on a read-only associative container, which should return a reference,
fails due to a non-existent search key, an exception of this type is raised.
*/
class no_match : public std::runtime_error {
public:
no_match() : std::runtime_error("key not found") {}
no_match(const std::string& reason) : std::runtime_error(reason) { }
};
template <typename TMap>
struct map_masquerade_helper {
typedef pair<const typename TMap::key_type, typename TMap::mapped_type> value_type;
typedef operations::member<value_type, const typename TMap::key_type, &value_type::first> key_accessor;
typedef operations::member<value_type, typename TMap::mapped_type, &value_type::second> value_accessor;
};
template <typename TMap>
class Keys
: public modified_container_impl< Keys<TMap>,
mlist< OperationTag< typename map_masquerade_helper<TMap>::key_accessor >,
HiddenTag< TMap > > >
, public GenericSet< Keys<TMap>, typename TMap::key_type, typename TMap::key_comparator_type> {
public:
const typename TMap::key_comparator_type& get_comparator() const
{
return this->hidden().get_comparator();
}
bool contains(const typename TMap::key_type& x) const
{
return this->hidden().exists(x);
}
};
template <typename TMap>
class Values
: public modified_container_impl< Values<TMap>,
mlist< OperationTag< typename map_masquerade_helper<TMap>::value_accessor >,
HiddenTag< TMap > > > { };
template <typename TMap> inline
const Keys<TMap>& keys(const TMap& map)
{
return reinterpret_cast<const Keys<TMap>&>(map);
}
template <typename TMap> inline
const Values<TMap>& values(const TMap& map)
{
return reinterpret_cast<const Values<TMap>&>(map);
}
namespace operations {
template <typename TMapRef, typename TKey>
class associative_access {
protected:
typename attrib<TMapRef>::minus_ref* map;
public:
associative_access(std::remove_reference_t<TMapRef>* map_arg=nullptr) : map(map_arg) {}
associative_access(const associative_access<std::remove_const_t<TMapRef>, TKey>& op) : map(op.map) {}
typedef TKey argument_type;
typedef typename inherit_ref<typename std::remove_reference_t<TMapRef>::mapped_type, TMapRef>::type result_type;
result_type operator() (const TKey& k) const
{
return (*map)[k];
}
template <typename, typename> friend class associative_access;
};
template <typename TMapRef>
class associative_search {
protected:
typename attrib<TMapRef>::minus_ref* map;
public:
associative_search(typename attrib<TMapRef>::minus_ref* map_arg=nullptr) : map(map_arg) {}
associative_search(const associative_search<typename attrib<TMapRef>::minus_const>& op) : map(op.map) {}
typedef void argument_type;
typedef bool result_type;
template <typename IteratorPair, typename Operation>
typename std::enable_if<check_iterator_feature<typename IteratorPair::first_type, end_sensitive>::value, bool>::type
operator() (binary_transform_iterator<IteratorPair, Operation>& it) const
{
return ! (static_cast<typename IteratorPair::first_type&>(it)=map->find(*it.second)).at_end();
}
template <typename IteratorPair, typename Operation>
typename std::enable_if<!check_iterator_feature<typename IteratorPair::first_type, end_sensitive>::value, bool>::type
operator() (binary_transform_iterator<IteratorPair, Operation>& it) const
{
return (static_cast<typename IteratorPair::first_type&>(it)=map->find(*it.second)) != map->end();
}
template <typename> friend class associative_search;
};
} // end namespace operations
template <typename TMapRef, typename TKey>
struct operation_cross_const_helper< operations::associative_access<TMapRef, TKey> > {
typedef operations::associative_access<typename attrib<TMapRef>::minus_const, TKey> operation;
typedef operations::associative_access<typename attrib<TMapRef>::plus_const, TKey> const_operation;
};
template <typename TMapRef>
struct operation_cross_const_helper< operations::associative_search<TMapRef> > {
typedef operations::associative_search<typename attrib<TMapRef>::minus_const> operation;
typedef operations::associative_search<typename attrib<TMapRef>::plus_const> const_operation;
};
template <typename TMap, typename TKeys,
bool keys_match=isomorphic_types<typename TMap::key_type, TKeys>::value>
class assoc_helper {
public:
typedef typename inherit_const<typename TMap::mapped_type, TMap>::type& result_type;
result_type operator()(TMap& map, const TKeys& k) const
{
return impl(map, k, std::is_const<TMap>());
}
protected:
static result_type impl(TMap& map, const TKeys& k, std::false_type)
{
return map.insert(k)->second;
}
static result_type impl(TMap& map, const TKeys& k, std::true_type)
{
typename TMap::const_iterator e=map.find(k);
if (e.at_end()) throw no_match();
return e->second;
}
};
template <typename TMap, size_t s>
class assoc_helper<TMap, char[s], true>
: assoc_helper<TMap, typename TMap::key_type, true> {
public:
typedef assoc_helper<TMap, typename TMap::key_type, true> base_t;
typename base_t::result_type operator()(TMap& map, const char (&k)[s]) const
{
return base_t::impl(map, typename TMap::key_type(k), std::is_const<TMap>());
}
};
template <typename TMap, typename TKeys>
class assoc_helper<TMap, TKeys, false> {
public:
typedef TransformedContainer<const TKeys&, operations::associative_access<TMap&, typename TKeys::value_type> > result_type;
result_type operator()(TMap& map, const TKeys& keys)
{
return result_type(keys, &map);
}
};
template <typename TMap, typename TKeys> inline
typename assoc_helper<const TMap, TKeys>::type
select_by_keys(const TMap& map, const TKeys& keys)
{
return assoc_helper<const TMap, TKeys>()(map, keys);
}
template <typename TMap, typename TKeys> inline
typename assoc_helper<TMap, TKeys>::type
select_by_keys(TMap& map, const TKeys& keys)
{
return assoc_helper<TMap, TKeys>()(map, keys);
}
struct is_map;
template <typename TMap>
struct hash_func<TMap, is_map> {
size_t operator() (const TMap& m) const
{
hash_func<typename TMap::key_type> key_hasher;
hash_func<typename TMap::mapped_type> mapped_hasher;
size_t a(1);
// we cannot depend on the keys being visited in any particular order because
// the Map might be a hash_map, so we need a commutative and associative operation
for (const auto e : m)
a += key_hasher(e.first) + mapped_hasher(e.second);
return a;
}
};
} // end namespace pm
namespace polymake {
using pm::Keys;
using pm::Values;
using pm::select_by_keys;
using pm::DefaultValueTag;
using pm::no_match;
}
#endif // POLYMAKE_INTERNAL_ASSOC_H
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