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Posted 29 Nov 2011
Licenced CPOL

Declare a reference for a two dimensional array without typecasting

, 25 Dec 2011
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This not so useful tip tells you how to declare a reference for a two dimensional array without needing to use typecasting.
int x[1][20];
int (*p)[20] = x;

Here p has become a reference to x.
Usually in most cases, we use:
int** p = (int**) x;

So, this tip gives you a hint about how to declare another reference for x without typecasting.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


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Mukit, Ataul
Chief Technology Officer Rational Technologies
Bangladesh Bangladesh
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Comments and Discussions

GeneralRe: Unfortunately, in the code I've seen both in the projects I ... Pin
Stefan_Lang3-Jan-12 2:57
memberStefan_Lang3-Jan-12 2:57 
Unfortunately, in the code I've seen both in the projects I worked on and in the internet, I've found it to be true. At the very least, almost all typecasts I've seen are unnecessary, in the sense that the variables involved were not defined as the correct type (e. g. using int instead of size_t when dealing with memory sizes), or are only necessary as a consequence of bad API design.

In the end, falling back to type casting undermines the built-in type safety of C++. For that reason alone you should avoid it.
GeneralIn your case as It was mentioned x is an address and what th... Pin
SiarheiY27-Dec-11 3:46
memberSiarheiY27-Dec-11 3:46 
GeneralRe: the first dimensions size can be anything FYKI Pin
Mukit, Ataul27-Dec-11 22:15
memberMukit, Ataul27-Dec-11 22:15 
GeneralReason for my vote of 4 maybe Stefan_Lang is right. Pin
yellowcrd26-Dec-11 18:56
memberyellowcrd26-Dec-11 18:56 
GeneralWhy do you say it's not useful? I'd say it is, especially si... Pin
Stefan_Lang5-Dec-11 22:19
memberStefan_Lang5-Dec-11 22:19 
GeneralRe: Never thought of it that way about the second form taking ex... Pin
Mukit, Ataul6-Dec-11 17:50
memberMukit, Ataul6-Dec-11 17:50 
GeneralRe: Type casting is done implicitly.Isn't it? Pin
yellowcrd26-Dec-11 19:21
memberyellowcrd26-Dec-11 19:21 
GeneralRe: "P.S.: type casting, especially C-style casts, are always ba... Pin
PIEBALDconsult3-Jan-12 2:43
memberPIEBALDconsult3-Jan-12 2:43 

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