Any.h

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/********************************************************************
**                Image Component Library (ICL)                    **
**                                                                 **
** Copyright (C) 2006-2013 CITEC, University of Bielefeld          **
**                         Neuroinformatics Group                  **
** Website: www.iclcv.org and                                      **
**          http://opensource.cit-ec.de/projects/icl               **
**                                                                 **
** File   : ICLUtils/src/ICLUtils/Any.h                            **
** Module : ICLUtils                                               **
** Authors: Christof Elbrechter                                    **
**                                                                 **
**                                                                 **
** GNU LESSER GENERAL PUBLIC LICENSE                               **
** This file may be used under the terms of the GNU Lesser General **
** Public License version 3.0 as published by the                  **
**                                                                 **
** Free Software Foundation and appearing in the file LICENSE.LGPL **
** included in the packaging of this file.  Please review the      **
** following information to ensure the license requirements will   **
** be met: http://www.gnu.org/licenses/lgpl-3.0.txt                **
**                                                                 **
** The development of this software was supported by the           **
** Excellence Cluster EXC 277 Cognitive Interaction Technology.    **
** The Excellence Cluster EXC 277 is a grant of the Deutsche       **
** Forschungsgemeinschaft (DFG) in the context of the German       **
** Excellence Initiative.                                          **
**                                                                 **
********************************************************************/

#pragma once

#include <ICLUtils/CompatMacros.h>
#include <ICLUtils/StringUtils.h>
#include <cstring>

namespace icl{
  namespace utils{


    struct Any : public std::string{
      inline Any(){}


      template<class T>
      inline Any(const T &t):std::string(str(t)){}


      template<class T>
      inline operator T() const{
        return as<T>();
      }


      template<class T>
      inline T as() const{
        return parse<T>(*this);
      }

      friend inline std::ostream& operator<<(std::ostream &s, const Any &any){
        return s << (const std::string&)any;
      }

      friend inline std::istream& operator>>(std::istream &s, Any &any){
        return s >> (std::string&)any;
      }

      private:
      Any(size_t n, char c):std::string(n,c){}

      public:


      template<class T>
      static T* ptr(const Any &any){
        return *(T**)(&any[0]);
      }


      template<class T>
      static Any ptr(const T *p){
        Any any(std::string(sizeof(void*),'\0'));
        *((const void**)&any[0]) = p;
        return any;
      }

    };

    template<>
    inline std::vector<float> Any::as<std::vector<float> >() const{
      const size_t l = std::string::length();
      if(l < sizeof(int)) throw ICLException("cannot convert Any to std::vector<float> size must be at least sizeof(int)");
      const icl8u *p = (const icl8u*)&std::string::operator[](0);
      int size = *((const int*)p);
      p += sizeof(int);
      if(l != sizeof(int) + sizeof(float) * size){
        throw ICLException("error converting Any to std::vector<float> unexpected size");
      }
      return std::vector<float>((const float*)p, ((const float*)p) + size);
    }

    template<>
    inline Any::Any(const std::vector<float> &v){
      std::string::resize(sizeof(int) + v.size() * sizeof(float));
      icl8u *p = (icl8u*)&std::string::operator[](0);
      *((int*)p) = v.size();
      memcpy(p+sizeof(int),v.data(), v.size()*sizeof(float));
    }

    template<>
    inline std::vector<int> Any::as<std::vector<int> >() const{
      const size_t l = std::string::length();
      if(l < sizeof(int)) throw ICLException("cannot convert Any to std::vector<int> size must be at least sizeof(int)");
      const icl8u *p = (const icl8u*)&std::string::operator[](0);
      int size = *((const int*)p);
      p += sizeof(int);
      if(l != sizeof(int) + sizeof(int) * size){
        throw ICLException("error converting Any to std::vector<int> unexpected size");
      }
      return std::vector<int>((const int*)p, ((const int*)p) + size);
    }

    template<>
    inline Any::Any(const std::vector<int> &v){
      std::string::resize(sizeof(int) + v.size() * sizeof(int));
      icl8u *p = (icl8u*)&std::string::operator[](0);
      *((int*)p) = v.size();
      memcpy(p+sizeof(int),v.data(), v.size()*sizeof(int));
    }

  } // namespace utils
}