delayedparameter.hh

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/* -*- mia-c++  -*-
 *
 * This file is part of MIA - a toolbox for medical image analysis
 * Copyright (c) Leipzig, Madrid 1999-2017 Gert Wollny
 *
 * MIA 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 3 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 MIA; if not, see <http://www.gnu.org/licenses/>.
 *
 */
 
#ifndef mia_core_delayedparameter_hh
#define mia_core_delayedparameter_hh
 
#include <string>
#include <stdexcept>
 
 
#include <mia/core/defines.hh>
#include <mia/core/datapool.hh>
#include <mia/core/errormacro.hh>
 
NS_MIA_BEGIN
 

template <typename T>
class TDelayedParameter
{
public:
 
       TDelayedParameter() = default;

       TDelayedParameter(const std::string& key);

       const T get() const;

       bool pool_has_key() const;

       bool key_is_valid() const;
 
       const std::string& get_key() const;
private:
       std::string m_key;
};
 
 
template <typename T>
TDelayedParameter<T>::TDelayedParameter(const std::string& key):
       m_key(key)
{
}
 
 
template <typename T>
const T TDelayedParameter<T>::get() const
{
       if (!(CDatapool::instance().has_key(m_key))) {
              throw create_exception<std::invalid_argument>("TDelayedParameter::get(): Key '", m_key,
                            "' is not available in the data pool");
       }
 
       return boost::any_cast<T>(CDatapool::instance().get(m_key));
}
 
template <typename T>
bool TDelayedParameter<T>::pool_has_key() const
{
       return CDatapool::instance().has_key(m_key);
}
 
 
template <typename T>
bool TDelayedParameter<T>::key_is_valid() const
{
       return !m_key.empty();
}
 
template <typename T>
const std::string& TDelayedParameter<T>::get_key() const
{
       return m_key;
}
 
NS_MIA_END
 
#endif