Re: cannot convert from 'long (*)[3]' to 'long *
Carl Daniel [VC++ MVP] wrote:
Allen Maki wrote:
Hi everybody,
I would apprecite it if you could help.
//Why I got the following error message? for the 4th line:
// error C2440: '=' : cannot convert from
//'long (*)[3]' to 'long *' Types pointed
//to are unrelated; conversion requires
// reinterpret_cast, C-style cast or
//function-style cast
There error message is telling you exactly what to do to eliminate the
error - use a reinterpret_cast, C-style cast or function-style cast.
#include <iostream>
using namespace std;
int main()
{
const int max = 4; //(1)
const int max2 = 3; //(2)
long *pprime; //(3)
pprime = new long[max][max2]; //(4)
pprime = (long*)new long[max][max2];
Oh, and one more thing: if you're planning on delete-ing this memory at
some point, you have to cast it back to the correct type before invoking
delete on it, otherwise it's undefined behavior. Under VC++ it will in
fact "work", but if you allocated a block of type long[3], then you have to
delete that type as well:
delete reinterpret_cast<long (*)[3]>(pprime);
-cd
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