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# STC [carr2, carr3](../include/stc/carray.h): Dynamic Multi-dimensional Arrays
The **carr2** and **carr3** are templated 2D and 3D dynamic arrays. They are allocated on the heap as a single
contiguous block of memory. The arrays can be indexed like regular constant size multi-dimensional arrays in C.
See the c++ class [boost::multi_array](https://www.boost.org/doc/libs/release/libs/multi_array) for similar functionality.
## Header file and declaration
```c
#define i_tag // defaults to i_val name
#define i_val // value: REQUIRED
#define i_valfrom // clone func i_val => i_val - defaults to plain copy
#define i_valdel // destroy value func - defaults to empty destruct
#include <stc/carr2.h> // or <stc/carr3.h>
```
`X` should be replaced by the value of i_tag in all of the following documentation.
## Methods
carr2_X:
```c
carr2_X carr2_X_init(size_t xdim, size_t ydim);
carr2_X carr2_X_with_values(size_t xdim, size_t ydim, Value val);
carr2_X carr2_X_with_storage(size_t xdim, size_t ydim, Value* array);
carr2_X carr2_X_clone(carr2_X arr);
Value* carr2_X_release(carr2_X* self); // release storage (not freed)
void carr2_X_del(carr2_X* self);
size_t carr2_X_size(carr2_X arr);
Value* carr2_X_data(carr2_X* self); // access storage data
Value* carr2_X_at(carr2_X* self, size_t x, size_t y);
carr2_X_iter_t carr2_X_begin(const carr2_X* self);
carr2_X_iter_t carr2_X_end(const carr2_X* self);
void carr2_X_next(carr2_X_iter_t* it);
```
carr3:
```c
carr3_X carr3_X_init(size_t xdim, size_t ydim, size_t zdim);
carr3_X carr3_X_with_values(size_t xdim, size_t ydim, size_t zdim, Value val);
carr3_X carr3_X_with_storage(size_t xdim, size_t ydim, size_t zdim, Value* array);
carr3_X carr3_X_clone(carr3_X arr);
Value* carr3_X_release(carr3_X* self); // release storage (not freed)
void carr3_X_del(carr3_X* self);
size_t carr3_X_size(carr3_X arr);
Value* carr3_X_data(carr3_X* self); // access storage data
Value* carr3_X_at(carr3_X* self, size_t x, size_t y, size_t z);
carr3_X_iter_t carr3_X_begin(const carr3_X* self);
carr3_X_iter_t carr3_X_end(const carr3_X* self);
void carr3_X_next(carr3_X_iter_t* it);
```
## Types
| Type name | Type definition | Used to represent... |
|:------------------|:-----------------------------------------------------|:---------------------|
| `carr2_X` | `struct { Value **data; size_t xdim, ydim; }` | The array 2D type |
| `carr2_X_value_t` | `Value` | The value type |
| `carr2_X_iter_t` | `struct { Value *ref; }` | Iterator type |
| `carr3_X` | `struct { Value ***data; size_t xdim, ydim, zdim; }` | The array 3D type |
| `carr3_X_value_t` | `Value` | The value type |
| `carr3_X_iter_t` | `struct { Value *ref; }` | Iterator type |
The **carr3** elements can be accessed like `carr3_i arr = ...; int val = arr.data[x][y][z];`, or with `carr3_i_at(&arr, x, y, z)`.
## Example
```c
#include <stdio.h>
#define i_tag i
#define i_val uint32_t
#include <stc/carr2.h>
#define i_tag f
#define i_val float
#include <stc/carr3.h>
int main()
{
// Ex1
int xd = 30, yd = 20, zd = 10;
// define arr3[30][20][10], initialized with zeros.
carr3_f arr3 = carr3_f_with_values(xd, yd, zd, 0.0f);
arr3.data[5][4][3] = 3.14f;
float *arr1 = arr3.data[5][4];
float **arr2 = arr3.data[5];
printf("%f\n", arr1[3]); // 3.14
printf("%f\n", arr2[4][3]); // 3.14
printf("%f\n", arr3.data[5][4][3]); // 3.14
carr3_f_del(&arr3); // free array
// Ex2
int w = 256, h = 128;
carr2_i image = carr2_i_init(w, h);
int n = 0;
c_foreach (i, carr2_i, image) {
uint32_t t = n++ % 256;
*i.ref = t | t << 8 | t << 16 | 255;
}
for (int y = 0; y < image.ydim; ++y)
image.data[y][y] = 0xffffffff;
carr2_i_del(&image);
}
```
Output:
```
3.140000
3.140000
3.140000
```
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