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// Example based on https://en.cppreference.com/w/cpp/container/mdspan
#define i_val int
#include <stc/cstack.h>
#include <stc/cspan.h>
#include <stdio.h>
using_cspan3(ispan, int);
int main()
{
cstack_int v = {0};
c_FORLIST (i, unsigned, {1,2,3,4,5,6,7,8,9,10,11,12})
cstack_int_push(&v, *i.ref);
// View data as contiguous memory representing 12 ints
ispan ms1 = cspan_from(&v);
// View data as contiguous memory representing 2 rows of 6 ints each
ispan2 ms2 = cspan_make(v.data, 2, 6);
// View the same data as a 3D array 2 x 3 x 2
ispan3 ms3 = cspan_make(v.data, 2, 3, 2);
// write data using 2D view
for (unsigned i=0; i != ms2.dim[0]; i++)
for (unsigned j=0; j != ms2.dim[1]; j++)
*cspan_at(&ms2, i, j) = i*1000 + j;
// print all items using 1D view
printf("all: ");
for (unsigned i=0; i != cspan_size(&ms1); i++)
printf(" %d", *cspan_at(&ms1, i));
puts("");
// or iterate a subspan...
ispan2 sub = cspan_subdim3(&ms3, 1);
printf("sub: ");
c_FOREACH (i, ispan2, sub)
printf(" %d", *i.ref);
puts("");
// read back using 3D view
for (unsigned i=0; i != ms3.dim[0]; i++)
{
printf("slice @ i = %u\n", i);
for (unsigned j=0; j != ms3.dim[1]; j++)
{
for (unsigned k=0; k != ms3.dim[2]; k++)
printf("%d ", *cspan_at(&ms3, i, j, k));
puts("");
}
}
cstack_int_drop(&v);
}
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