One array type, several names
typedef double matrix[16][64]; matrix B; double C[16][64]; B and C have the same type. A typedef gives matrix as another way to write double[16][64]; it does not create a distinct type. section 6.4
A type alias is an alternative name for an existing C type. The typedef mechanism can name structures, arrays, and other types, but the alias and the original type remain identical. section 6.4
TAKEAWAY
- A typedef creates an alias, never a new type. section 6.4
- A structure can be forward-declared within a typedef by repeating the same identifier as its tag. section 6.4
- Names ending in _t are reserved because the C standard uses that convention for typedef names; do not introduce such names yourself. section 6.4 section 2.1
typedef double vector[64];
typedef vector vecvec[16];
vecvec A;
typedef double matrix[16][64];
matrix B;
double C[16][64];
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Compare aliases built in stages with equivalent declarations written directly as multidimensional arrays. section 6.4
