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digitalmars.D.learn - Cast a 2d static array to a 1d static array. T[s][r] -> T[s*r]

reply Jonathan <JonathanILevi gmail.com> writes:
Is it possible to cast a 2d static length array to a 1d static 
length array?

E.g.
int[2][2] a = [[1,2],[3,4]];
int[4]    b = cast(int[4])a;

Is not the byte data in memory exactly the same?
Feb 27 2018
parent reply Jonathan <JonathanILevi gmail.com> writes:
On Tuesday, 27 February 2018 at 22:13:05 UTC, Jonathan wrote:
 Is it possible to cast a 2d static length array to a 1d static 
 length array?

 E.g.
 int[2][2] a = [[1,2],[3,4]];
 int[4]    b = cast(int[4])a;

 Is not the byte data in memory exactly the same?
*( [pos,size].ptr .cst!(void*) .cst!(int[4]*) ) (using dub `cst` library) or *( cast(int[4]*)(cast(void*)([pos,size].ptr)) ) Okay, this works but is this the best way?!
Feb 27 2018
parent TheFlyingFiddle <none none.com> writes:
On Tuesday, 27 February 2018 at 22:17:25 UTC, Jonathan wrote:
 On Tuesday, 27 February 2018 at 22:13:05 UTC, Jonathan wrote:
 Is it possible to cast a 2d static length array to a 1d static 
 length array?

 E.g.
 int[2][2] a = [[1,2],[3,4]];
 int[4]    b = cast(int[4])a;

 Is not the byte data in memory exactly the same?
*( [pos,size].ptr .cst!(void*) .cst!(int[4]*) ) (using dub `cst` library) or *( cast(int[4]*)(cast(void*)([pos,size].ptr)) ) Okay, this works but is this the best way?!
This should work int[4] b = *(cast(int[4]*)a.ptr);
Feb 27 2018