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// callback.tcc
// robert - programme du robot 2005. {{{
//
// Copyright (C) 2004 Nicolas Schodet
//
// 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 of the License, or
// (at your option) any later version.
// 
// 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.
//
// Contact :
//        Web: http://perso.efrei.fr/~schodet/
//      Email: <contact@ni.fr.eu.org>
// }}}

#include <algorithm>

/// Default constructor.  Make an empty callback.
template<typename R>
Callback<R>::Callback (void)
    : holder_ (0)
{
}

/// Constructor.
template<typename R>
template<typename T>
Callback<R>::Callback (T callback)
    : holder_ (new Holder<T> (callback))
{
}

/// Copy constructor.
template<typename R>
Callback<R>::Callback (const Callback<R> &other)
    : holder_ (other.holder_ ? other.holder_->clone () : 0)
{
}

/// Destructor.
template<typename R>
Callback<R>::~Callback (void)
{
    delete holder_;
}

/// Assignement operator.
template<typename R>
Callback<R> &
Callback<R>::operator= (const Callback<R> &rhs)
{
    Callback<R> (rhs).swap (*this);
    return *this;
}

/// Call the contained callback.
template<typename R>
R
Callback<R>::operator () (void)
{
    if (!holder_)
	throw bad_callback ();
    else
	return (*holder_) ();
}

/// Swap the callback content with another callback.
template<typename R>
void
Callback<R>::swap (Callback<R> &rhs)
{
    std::swap (holder_, rhs.holder_);
}

/// Change the contained callback.
template<typename R>
template<typename T>
Callback<R> &
Callback<R>::operator= (T rhs)
{
    Callback<R> (rhs).swap (*this);
    return *this;
}

/// Test if empty.
template<typename R>
bool
Callback<R>::empty (void) const
{
    return !holder_;
}

/// Test if not empty.
template<typename R>
Callback<R>::operator bool (void) const
{
    return !empty ();
}

template<typename R>
Callback<R>::AbstractHolder::~AbstractHolder (void)
{
}

template<typename R>
template<typename T>
Callback<R>::Holder<T>::Holder (T callback)
    : callback_ (callback)
{
}

template<typename R>
template<typename T>
R
Callback<R>::Holder<T>::operator () (void)
{
    return callback_ ();
}

template<typename R>
template<typename T>
typename Callback<R>::AbstractHolder *
Callback<R>::Holder<T>::clone (void)
{
    return new Holder<T> (callback_);
}