view.hpp

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/*
 * Copyright (C) 1998-2018 ALPS Collaboration. See COPYRIGHT.TXT
 * All rights reserved. Use is subject to license terms. See LICENSE.TXT
 * For use in publications, see ACKNOWLEDGE.TXT
 */

#ifndef ALPSCORE_GF_VIEW_H
#define ALPSCORE_GF_VIEW_H


#include "data_storage.hpp"

namespace alps {
  namespace numerics {
    namespace detail {

      template<typename T>
      class view {
      private:
        T* data_;
        size_t size_;
      public:
        view(typename std::remove_cv<T>::type * data, size_t size) : data_(data), size_(size){}
        view(const T* data, size_t size) : data_(const_cast<T*>(data)), size_(size){}
        view(data_storage<T>&storage) : data_(storage.data()), size_(storage.size())  {}
        view(const view & view) : data_(view.data_), size_(view.size_) {}
        view(view && view) : data_(view.data_), size_(view.size_) {}

        view<T>& operator=(const view<T> & rhs) {
          assert(size_ == rhs.size_);
          std::copy(rhs.data_, rhs.data_+rhs.size_, data_);
          return (*this);
        }

        view<T> operator=(view<T> && rhs) {
          assert(size_ == rhs.size_);
          std::copy(rhs.data_, rhs.data_+rhs.size_, data_);
          return (*this);
        }

        inline T& data(size_t i) {return data_[i];};
        inline const T& data(size_t i) const {return data_[i];};
        size_t size() const {return size_;}
        inline T* data() {return data_;};
        inline const T* data() const {return data_;};
      };
    }
  }
}

#endif //ALPSCORE_GF_VIEW_H