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ref_array.hh
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/**
* file ref_array.hh
*
* @author Till Junge <till.junge@epfl.ch>
*
* @date 04 Dec 2018
*
* @brief convenience class to simulate an array of references
*
* Copyright © 2018 Till Junge
*
* µGrid is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3, or (at
* your option) any later version.
*
* µGrid 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 Lesser General Public License
* along with GNU Emacs; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* Additional permission under GNU GPL version 3 section 7
*
* If you modify this Program, or any covered work, by linking or combining it
* with proprietary FFT implementations or numerical libraries, containing parts
* covered by the terms of those libraries' licenses, the licensors of this
* Program grant you additional permission to convey the resulting work.
*/
#ifndef SRC_COMMON_REF_ARRAY_HH_
#define SRC_COMMON_REF_ARRAY_HH_
#include <array>
#include <initializer_list>
#include "iterators.hh"
namespace muGrid {
namespace internal {
template <typename T, typename FirstVal, typename... RestVals>
struct TypeChecker {
constexpr static bool value{
std::is_same<T, std::remove_reference_t<FirstVal>>::value and
TypeChecker<T, RestVals...>::value};
};
template <typename T, typename OnlyVal>
struct TypeChecker<T, OnlyVal> {
constexpr static bool value{
std::is_same<T, std::remove_reference_t<OnlyVal>>::value};
};
} // namespace internal
template <typename T, size_t N>
class RefArray {
public:
//! Default constructor
RefArray() = delete;
template <typename... Vals>
explicit RefArray(Vals &... vals) : values{&vals...} {
static_assert(internal::TypeChecker<T, Vals...>::value,
"Only refs to type T allowed");
}
//! Copy constructor
RefArray(const RefArray & other) = default;
//! Move constructor
RefArray(RefArray && other) = default;
//! Destructor
virtual ~RefArray() = default;
//! Copy assignment operator
RefArray & operator=(const RefArray & other) = default;
//! Move assignment operator
RefArray & operator=(RefArray && other) = delete;
T & operator[](size_t index) { return *this->values[index]; }
constexpr T & operator[](size_t index) const {
return *this->values[index];
}
protected:
std::array<T *, N> values{};
private:
};
} // namespace muGrid
#endif // SRC_COMMON_REF_ARRAY_HH_

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