C/C++ typecasting convert int to const int

Question

Consider the following code snippet.

int** ptr;  // memory pointed by ptr is initialized to its content.
const int** ptrConst;
ptrConst = ptr // Now I want to convert it type of const int**

It gives compilation error conversion loses qualifier.

Please suggest an alternative to achieve it.

As you can see from the linked dupe this is potentially risky, and in any case you might want to consider moving away from multiple indirection, there's usually better ways of handling this in C++. — user657267, Jan 27 '16 at 06:58
The reason why that is now allowed is explained in [Question 11.10 of the C FAQ](http://c-faq.com/ansi/constmismatch.html). Don't do it. — R Sahu, Jan 27 '16 at 06:59

score 0 · Answer 1 · edited May 23 '17 at 11:45

0

You can use const_cast.

ptrConst = const_cast<const int**>(ptr);

You may wish to read this question for information on why this is not a good idea.

edited May 23 '17 at 11:45

Community

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answered Jan 27 '16 at 06:45

Paul Rooney

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And what should it be like in C? – Or b Apr 06 '21 at 13:38

C/C++ typecasting convert int** to const int**

1 Answers1

C/C++ typecasting convert int to const int