Function construct_elements_of_array

Eigen/src/Core/util/Memory.h:265–335

  * The \a size parameter tells on how many objects to call the constructor of T.
  */
template<typename T> EIGEN_DEVICE_FUNC inline T* construct_elements_of_array(T *ptr, std::size_t size)
{
  std::size_t i;
  EIGEN_TRY
  {
      for (i = 0; i < size; ++i) ::new (ptr + i) T;
      return ptr;
  }
  EIGEN_CATCH(...)
  {
    destruct_elements_of_array(ptr, i);
    EIGEN_THROW;
  }
  return NULL;
}

/*****************************************************************************
*** Implementation of aligned new/delete-like functions                    ***
*****************************************************************************/

template<typename T>
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE void check_size_for_overflow(std::size_t size)
{
  if(size > std::size_t(-1) / sizeof(T))
    throw_std_bad_alloc();
}

/** \internal Allocates \a size objects of type T. The returned pointer is guaranteed to have 16 bytes alignment.
  * On allocation error, the returned pointer is undefined, but a std::bad_alloc is thrown.
  * The default constructor of T is called.
  */
template<typename T> EIGEN_DEVICE_FUNC inline T* aligned_new(std::size_t size)
{
  check_size_for_overflow<T>(size);
  T *result = reinterpret_cast<T*>(aligned_malloc(sizeof(T)*size));
  EIGEN_TRY
  {
    return construct_elements_of_array(result, size);
  }
  EIGEN_CATCH(...)
  {
    aligned_free(result);
    EIGEN_THROW;
  }
  return result;
}

template<typename T, bool Align> EIGEN_DEVICE_FUNC inline T* conditional_aligned_new(std::size_t size)
{
  check_size_for_overflow<T>(size);
  T *result = reinterpret_cast<T*>(conditional_aligned_malloc<Align>(sizeof(T)*size));
  EIGEN_TRY
  {
    return construct_elements_of_array(result, size);
  }
  EIGEN_CATCH(...)
  {
    conditional_aligned_free<Align>(result);