Array3d

Array3d#

template<const int ndims, typename T = real>
class Array3d#

Class for creating a 3-dimensional array with (optionally) non-zero lower bounds.

Template Parameters:

  • ndims – The number of pseudo-dimensions. Can be 0, 1, 2 or 3. If the ndims less than 3, the created array can still be accessed with 3 indices, but the second and/or third indices are ignored.

  • T – The array datatype.

Public Functions

Array3d() = default#

Default constructor.

This generates a zero-sized array.

inline Array3d(int i0, int i1, int j0, int j1, int k0 = 0, int k1 = 0)#

Standard constructor.

This creates an array using the lower and upper bounds for each dimension. If ndims is less than 3 then the corresponding dimensions are given an upper and lower bound of zero, resulting in a size of 1.

Example: 

Array3d<1> array1d(1, 10, 1, 10, 1, 10);
// array1d.sx == 10,   array1d.sy == array1d.sz == 1
Array3d<2> array2d(1, 10, 1, 10, 1, 10);
// array2d.sx == array2d.sy == 10,   array2d.sz == 1

Parameters:

  • i0, i1 – Lower and upper bounds of the 1st dimension

  • j0, j1 – Lower and upper bounds of the 2nd dimension

  • k0, k1 – Lower and upper bounds of the 3rd dimension

inline Array3d(int i1, int j1, int k1)#

Basic constructor.

This creates arrays with lower bounds all set to 1. If ndims is less than 3 then the corresponding dimensions are given an upper and lower bound of zero, resulting in a size of 1.

Parameters:

  • i1 – Upper bound of the 1st dimension

  • j1 – Upper bound of the 2nd dimension

  • k1 – Upper bound of the 3rd dimension

inline Array3d(int i0, int i1, int j0, int j1, int k0, int k1, void *data_)#

Standard constructor with memory reference.

This constructor can be used when the memory has already allocated elsewhere. It takes the same arguments as the standard constructor with the addition of a pointer to the memory to use. Allocation and deallocation of this memory is the responsibility of the caller.

Example: 

constexpr int nx = 10, ny = 20, nz = 30;
std::array<double, nx * ny * nz> mem;
auto myarray = Array3d<3>(1, nx, 1, ny, 1, nz, mem.data());

Parameters:

  • i0, i1 – Lower and upper bounds of the 1st dimension

  • j0, j1 – Lower and upper bounds of the 2nd dimension

  • k0, k1 – Lower and upper bounds of the 3rd dimension

  • data_ – Pointer to existing array storage to use

auto *get_data() const#

Get a pointer to the memory used for the 3d array.

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