MemoryUtils.hpp

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 * SUPPORT OPEN SCIENCE!  If you use OpenMD or its source code in your
 * research, please cite the appropriate papers when you publish your
 * work.  Good starting points are:
 *
 * [1] Meineke, et al., J. Comp. Chem. 26, 252-271 (2005).
 * [2] Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006).
 * [3] Sun, Lin & Gezelter, J. Chem. Phys. 128, 234107 (2008).
 * [4] Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011).
 * [5] Kuang & Gezelter, Mol. Phys., 110, 691-701 (2012).
 * [6] Lamichhane, Gezelter & Newman, J. Chem. Phys. 141, 134109 (2014).
 * [7] Lamichhane, Newman & Gezelter, J. Chem. Phys. 141, 134110 (2014).
 * [8] Bhattarai, Newman & Gezelter, Phys. Rev. B 99, 094106 (2019).
 */
 
/**
 * @file    MemoryUtils.hpp
 * @authors tlin crdrisko
 * @date    10/25/2004
 * @version 1.0
 */
 
#ifndef OPENMD_UTILS_MEMORYUTILS_HPP
#define OPENMD_UTILS_MEMORYUTILS_HPP
 
#include <memory>
#include <type_traits>
#include <utility>
 
namespace OpenMD::Utils {
  namespace details {
 
    template<typename, typename = std::void_t<>>
    struct is_container : std::false_type {};
 
    template<typename T>
    struct is_container<T, std::void_t<typename T::value_type,
                                       typename T::reference,
                                       typename T::const_reference,
                                       typename T::iterator,
                                       typename T::const_iterator,
                                       typename T::difference_type,
                                       typename T::size_type,
                                       decltype(std::declval<T>().begin()),
                                       decltype(std::declval<T>().end()),
                                       decltype(std::declval<T>().cbegin()),
                                       decltype(std::declval<T>().cend()),
                                       decltype(std::declval<T>().max_size()),
                                       decltype(std::declval<T>().empty())>> : std::true_type {};
 
    // Convenience variable template for ease-of-use
    template<typename T>
    constexpr bool is_container_v = is_container<T>::value;
 
    template<typename T>
    void lifted_deleter(T val) {
      delete val;
    }
 
    template<typename T1, typename T2>
    void lifted_deleter(std::pair<T1, T2>& val) {
      lifted_deleter(val.second);
    }
  }  // namespace details
 
  // Recursively deallocate the previously allocated memory from each container
  template<typename Container>
  void deletePointers(Container& container) {
    if constexpr(details::is_container_v<typename Container::value_type>) {
      for (auto& elem : container)
        deletePointers(elem);
    } else {
      for (auto& elem : container)
        details::lifted_deleter(elem);
    }
  }
}  // namespace OpenMD::Utils
 
#endif  // OPENMD_UTILS_MEMORYUTILS_HPP