c++ array/pointer declarations issue

Question

I'm trying to solve the difference between three following declarations in c++. I appended my guesses:

const float *x[4] - 4-element array of pointers on arrays of constant floats
const float (*x)[4] - I'm confused here... is it the same as above?
const float *(*x)[4] - the same as above but "on arrays of arrays of constant floats"

Any help/explanation will be appreciated.

Get cdecl and don't look back.

Carl Norum
– Carl Norum

2013-06-14 18:28:44 +00:00
Commented Jun 14, 2013 at 18:28 — Carl Norum
– Carl Norum, Commented Jun 14, 2013 at 18:28
@CarlNorum definitely, you're right. :)

ducin
– ducin

2013-06-14 23:03:15 +00:00
Commented Jun 14, 2013 at 23:03 — ducin
– ducin, Commented Jun 14, 2013 at 23:03

VoidPointer · Accepted Answer · 2013-06-14 18:40:51Z

4

Use cdecl to know declarations,

const float *x[4] - Declare x as array 4 of pointer to const float
const float (*x)[4] - Declare x as pointer to array 4 of const float
const float *(*x)[4] - Declare x as pointer to array 4 of pointer to const float

Source : cdecl.org

edited Jun 14, 2013 at 18:40

answered Jun 14, 2013 at 18:28

VoidPointer

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kotlomoy · Accepted Answer · 2013-06-14 18:28:23Z

2

const float *x[4] - 4-element array of pointers on arrays of constant floats

4-element array of pointers to constant floats.

const float (*x)[4] - I'm confused here... is it the same as above?

Pointer to 4-element array of constant floats.

const float *(*x)[4] - the same as above but "on arrays of arrays of constant floats"

Pointer to 4-element array of pointers to constant floats.

answered Jun 14, 2013 at 18:28

kotlomoy

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Deepu · Accepted Answer · 2013-06-14 18:32:12Z

1

const float *x[4]    -  An array of pointers to constant floats
const float (*x)[4]  -  A pointer to an constant float array with 4 elements
const float *(*x)[4] -  A pointer to an array of pointers to constant float

answered Jun 14, 2013 at 18:32

Deepu

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