pair.h

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/*
 * Copyright (c) 2018 Caliola Engineering, LLC.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Jared Dulmage <jared.dulmage@caliola.com>
 */
 
#ifndef PAIR_H
#define PAIR_H
 
#include "attribute-helper.h"
#include "string.h"
 
#include <sstream>
#include <type_traits>
#include <typeinfo> // typeid
#include <utility>
 
namespace ns3
{
 
template <class A, class B>
std::ostream&
operator<<(std::ostream& os, const std::pair<A, B>& p)
{
    os << "(" << p.first << "," << p.second << ")";
    return os;
}
 
// Doxygen for this class is auto-generated by
// utils/print-introspected-doxygen.h
 
template <class A, class B>
class PairValue : public AttributeValue
{
  public:
    typedef std::pair<Ptr<A>, Ptr<B>> value_type;
    typedef typename std::invoke_result_t<decltype(&A::Get), A> first_type;
    typedef typename std::invoke_result_t<decltype(&B::Get), B> second_type;
    typedef typename std::pair<first_type, second_type> result_type;
 
    PairValue();
 
    PairValue(const result_type& value); // "import" constructor
 
    // Inherited
    Ptr<AttributeValue> Copy() const override;
    bool DeserializeFromString(std::string value, Ptr<const AttributeChecker> checker) override;
    std::string SerializeToString(Ptr<const AttributeChecker> checker) const override;
 
    result_type Get() const;
    /* Documented by print-introspected-doxygen.cc */
    void Set(const result_type& value);
 
    template <typename T>
    bool GetAccessor(T& value) const;
 
  private:
    value_type m_value;
};
 
class PairChecker : public AttributeChecker
{
  public:
    typedef std::pair<Ptr<const AttributeChecker>, Ptr<const AttributeChecker>> checker_pair_type;
 
    virtual void SetCheckers(Ptr<const AttributeChecker> firstchecker,
                             Ptr<const AttributeChecker> secondchecker) = 0;
 
    virtual checker_pair_type GetCheckers() const = 0;
};
 
template <class A, class B>
Ptr<AttributeChecker> MakePairChecker(const PairValue<A, B>& value);
 
template <class A, class B>
Ptr<const AttributeChecker> MakePairChecker(Ptr<const AttributeChecker> firstchecker,
                                            Ptr<const AttributeChecker> secondchecker);
 
template <class A, class B>
Ptr<AttributeChecker> MakePairChecker();
 
template <typename A, typename B, typename T1>
Ptr<const AttributeAccessor> MakePairAccessor(T1 a1);
 
} // namespace ns3
 
/*****************************************************************************
 * Implementation below
 *****************************************************************************/
 
namespace ns3
{
 
// This internal class defines templated PairChecker class that is instantiated
// in MakePairChecker. The non-templated base ns3::PairChecker is returned in that
// function. This is the same pattern as ObjectPtrContainer.
namespace internal
{
 
template <class A, class B>
class PairChecker : public ns3::PairChecker
{
  public:
    PairChecker();
    PairChecker(Ptr<const AttributeChecker> firstchecker,
                Ptr<const AttributeChecker> secondchecker);
    void SetCheckers(Ptr<const AttributeChecker> firstchecker,
                     Ptr<const AttributeChecker> secondchecker) override;
    typename ns3::PairChecker::checker_pair_type GetCheckers() const override;
 
  private:
    Ptr<const AttributeChecker> m_firstchecker;
    Ptr<const AttributeChecker> m_secondchecker;
};
 
template <class A, class B>
PairChecker<A, B>::PairChecker()
    : m_firstchecker(nullptr),
      m_secondchecker(nullptr)
{
}
 
template <class A, class B>
PairChecker<A, B>::PairChecker(Ptr<const AttributeChecker> firstchecker,
                               Ptr<const AttributeChecker> secondchecker)
    : m_firstchecker(firstchecker),
      m_secondchecker(secondchecker)
{
}
 
template <class A, class B>
void
PairChecker<A, B>::SetCheckers(Ptr<const AttributeChecker> firstchecker,
                               Ptr<const AttributeChecker> secondchecker)
{
    m_firstchecker = firstchecker;
    m_secondchecker = secondchecker;
}
 
template <class A, class B>
typename ns3::PairChecker::checker_pair_type
PairChecker<A, B>::GetCheckers() const
{
    return std::make_pair(m_firstchecker, m_secondchecker);
}
 
} // namespace internal
 
template <class A, class B>
Ptr<AttributeChecker>
MakePairChecker(const PairValue<A, B>& value)
{
    return MakePairChecker<A, B>();
}
 
template <class A, class B>
Ptr<const AttributeChecker>
MakePairChecker(Ptr<const AttributeChecker> firstchecker, Ptr<const AttributeChecker> secondchecker)
{
    auto checker = MakePairChecker<A, B>();
    auto acchecker = DynamicCast<PairChecker>(checker);
    acchecker->SetCheckers(firstchecker, secondchecker);
    return checker;
}
 
template <class A, class B>
Ptr<AttributeChecker>
MakePairChecker()
{
    std::string pairName;
    std::string underlyingType;
    typedef PairValue<A, B> T;
    std::string first_type_name = typeid(typename T::value_type::first_type).name();
    std::string second_type_name = typeid(typename T::value_type::second_type).name();
    {
        std::ostringstream oss;
        oss << "ns3::PairValue<" << first_type_name << ", " << second_type_name << ">";
        pairName = oss.str();
    }
 
    {
        std::ostringstream oss;
        oss << typeid(typename T::value_type).name();
        underlyingType = oss.str();
    }
 
    return MakeSimpleAttributeChecker<T, internal::PairChecker<A, B>>(pairName, underlyingType);
}
 
template <class A, class B>
PairValue<A, B>::PairValue()
    : m_value(std::make_pair(Create<A>(), Create<B>()))
{
}
 
template <class A, class B>
PairValue<A, B>::PairValue(const typename PairValue<A, B>::result_type& value)
{
    Set(value);
}
 
template <class A, class B>
Ptr<AttributeValue>
PairValue<A, B>::Copy() const
{
    auto p = Create<PairValue<A, B>>();
    // deep copy if non-null
    if (m_value.first)
    {
        p->m_value = std::make_pair(DynamicCast<A>(m_value.first->Copy()),
                                    DynamicCast<B>(m_value.second->Copy()));
    }
    return p;
}
 
template <class A, class B>
bool
PairValue<A, B>::DeserializeFromString(std::string value, Ptr<const AttributeChecker> checker)
{
    auto pchecker = DynamicCast<const PairChecker>(checker);
    if (!pchecker)
    {
        return false;
    }
 
    std::istringstream iss(value); // copies value
    iss >> value;
    auto first = pchecker->GetCheckers().first->CreateValidValue(StringValue(value));
    if (!first)
    {
        return false;
    }
 
    auto firstattr = DynamicCast<A>(first);
    if (!firstattr)
    {
        return false;
    }
 
    iss >> value;
    auto second = pchecker->GetCheckers().second->CreateValidValue(StringValue(value));
    if (!second)
    {
        return false;
    }
 
    auto secondattr = DynamicCast<B>(second);
    if (!secondattr)
    {
        return false;
    }
 
    m_value = std::make_pair(firstattr, secondattr);
    return true;
}
 
template <class A, class B>
std::string
PairValue<A, B>::SerializeToString(Ptr<const AttributeChecker> checker) const
{
    std::ostringstream oss;
    oss << m_value.first->SerializeToString(checker);
    oss << " ";
    oss << m_value.second->SerializeToString(checker);
 
    return oss.str();
}
 
template <class A, class B>
typename PairValue<A, B>::result_type
PairValue<A, B>::Get() const
{
    return std::make_pair(m_value.first->Get(), m_value.second->Get());
}
 
template <class A, class B>
void
PairValue<A, B>::Set(const typename PairValue<A, B>::result_type& value)
{
    m_value = std::make_pair(Create<A>(value.first), Create<B>(value.second));
}
 
template <class A, class B>
template <typename T>
bool
PairValue<A, B>::GetAccessor(T& value) const
{
    value = T(Get());
    return true;
}
 
template <typename A, typename B, typename T1>
Ptr<const AttributeAccessor>
MakePairAccessor(T1 a1)
{
    return MakeAccessorHelper<PairValue<A, B>>(a1);
}
 
} // namespace ns3
 
#endif // PAIR_H