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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/internal/converters_basic_defs.h"
#include "polymake/internal/operations.h"
#include "polymake/TransformedContainer.h"
#include <cstdlib>
#include <cmath>
namespace pm {
template <typename From1, typename From2, typename To1, typename To2,
int cc1=(std::is_convertible<From1, To1>::value*2+is_explicitly_convertible_to<From1, To1>::value),
int cc2=(std::is_convertible<From2, To2>::value*2+is_explicitly_convertible_to<From2, To2>::value)>
class pair_conv : public nothing {};
template <typename From1, typename From2, typename To1, typename To2>
class pair_conv<From1, From2, To1, To2, 2, 2>
{
public:
pair<To1, To2> operator() (const pair<From1, From2>& p) const
{
return pair<To1, To2>(p.first, p.second);
}
};
template <typename From1, typename From2, typename To1, typename To2>
class pair_conv<From1, From2, To1, To2, 2, 1>
{
private:
conv<From2, To2> c2;
public:
pair<To1, To2> operator() (const pair<From1, From2>& p) const
{
return pair<To1, To2>(p.first, c2(p.second));
}
};
template <typename From1, typename From2, typename To1, typename To2>
class pair_conv<From1, From2, To1, To2, 1, 2>
{
private:
conv<From1, To1> c1;
public:
pair<To1, To2> operator() (const pair<From1, From2>& p) const
{
return pair<To1, To2>(c1(p.first), p.second);
}
};
template <typename From1, typename From2, typename To1, typename To2>
class pair_conv<From1, From2, To1, To2, 1, 1>
{
private:
conv<From1, To1> c1;
conv<From2, To2> c2;
public:
pair<To1, To2> operator() (const pair<From1, From2>& p) const
{
return pair<To1, To2>(c1(p.first), c2(p.second));
}
};
template <typename From1, typename From2, typename To1, typename To2>
class conv< pair<From1, From2>, pair<To1, To2> > :
public pair_conv<From1, From2, To1, To2>
{
public:
typedef pair<From1, From2> argument_type;
typedef pair<To1, To2> result_type;
};
// resolving the ambiguity
template <typename T1, typename T2>
class conv< pair<T1, T2>, pair<T1, T2> > {
public:
typedef pair<T1, T2> argument_type;
typedef argument_type result_type;
const result_type& operator() (const argument_type& p) const { return p; }
};
template <typename Target, typename Container>
auto attach_converter(const Container& src,
std::enable_if_t<can_initialize<typename object_traits<typename Container::value_type>::persistent_type, Target>::value &&
!std::is_convertible<typename object_traits<typename Container::value_type>::persistent_type, Target>::value, void**> =nullptr)
{
typedef conv<typename object_traits<typename Container::value_type>::persistent_type, Target> converter;
return TransformedContainer<const Container&, converter>(src);
}
template <typename Target, typename Container, typename ConverterArg>
TransformedContainer<const Container&, conv<typename object_traits<typename Container::value_type>::persistent_type, Target> >
attach_converter(const Container& src, const ConverterArg& conv_arg,
std::enable_if_t<is_explicitly_convertible_to<typename object_traits<typename Container::value_type>::persistent_type, Target>::value, void**> =nullptr)
{
return TransformedContainer<const Container&, conv<typename object_traits<typename Container::value_type>::persistent_type, Target> >
(src, conv_arg);
}
template <typename Target, typename Container>
const Container&
attach_converter(const Container& src,
std::enable_if_t<std::is_convertible<typename object_traits<typename Container::value_type>::persistent_type, Target>::value, void**> =nullptr)
{
return src;
}
template <typename Target, typename Iterator>
auto make_converting_iterator(Iterator&& it,
std::enable_if_t<can_initialize<typename iterator_traits<Iterator>::value_type, Target>::value &&
!std::is_convertible<typename iterator_traits<Iterator>::value_type, Target>::value, void**> =nullptr)
{
typedef conv<typename object_traits<typename iterator_traits<Iterator>::value_type>::persistent_type, Target> converter;
return unary_transform_iterator<pointer2iterator_t<Iterator>, converter>(pointer2iterator(std::forward<Iterator>(it)));
}
template <typename Target, typename Iterator>
decltype(auto) make_converting_iterator(Iterator&& it,
std::enable_if_t<std::is_convertible<typename iterator_traits<Iterator>::value_type, Target>::value, void**> =nullptr)
{
return pointer2iterator(std::forward<Iterator>(std::forward<Iterator>(it)));
}
//! trivial conversion of an object to itself (mutable access)
template <typename Target, typename Source>
inherit_reference_t<Target, Source&&>
convert_to(Source&& x,
std::enable_if_t<is_derived_from<pure_type_t<Source>, Target>::value ||
std::is_same<pure_type_t<Source>, Target>::value, void**> =nullptr)
{
return std::forward<Source>(x);
}
template <typename Target, typename Source>
Target convert_to(Source x,
std::enable_if_t<std::is_arithmetic<Source>::value &&
std::is_arithmetic<Target>::value &&
!std::is_same<Source, Target>::value, void**> =nullptr)
{
return Target(x);
}
//! conversion via functor
template <typename Target, typename Source>
Target convert_to(const Source& x,
std::enable_if_t<can_initialize<Source, Target>::value &&
(!std::is_arithmetic<Source>::value || !std::is_arithmetic<Target>::value) &&
!is_derived_from<Source, Target>::value, void**> =nullptr)
{
return conv<Source, Target>()(x);
}
} // end namespace pm
namespace polymake {
using pm::conv;
using pm::attach_converter;
using pm::convert_to;
}
// Local Variables:
// mode:C++
// c-basic-offset:3
// indent-tabs-mode:nil
// End:
|
