Array and struct initialize in C++

Question

I would like to initilize some elements of an struct and array in C++.

In C you can do:

unsigned char array[30] = {[1] = 4, [20] = 4};
struct mystruct 
{ int i;
  int j;
}
struct mystruct e = {.j = 2};

But I cannot do it in C++. Is there any way to implement this kind of designated initializers?

@Oli: Though that was 11 years ago. Would be nice to not have to specify... :/ — GManNickG
– GManNickG, Commented Oct 22, 2010 at 11:25
@GMan: It may be 11 years ago, but there are still plenty of platforms that don't really support C99 (embedded springs to mind). If someone says "C" to me, I assume they mean the common denominator of all dialects. YMMV... — Oliver Charlesworth
– Oliver Charlesworth, Commented Oct 22, 2010 at 11:39

AbstractProblemFactory · Accepted Answer · 2010-10-22 11:08:40Z

1

In C++ struct has constructors (just like class), so you could always init your var in them.

answered Oct 22, 2010 at 11:08

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1 Comment

It is a struct that comes from a C lib I cannot compile :( But I was thinking on that

vrbilgi · Accepted Answer · 2010-10-25 06:37:30Z

0

Its always good to Initialize ALL the element in array or structure to avoid many errors.

Below may help you.

Initialization for struct

struct myStruct

{

   int i;

   int j;

   myStruct()
   {
       j=10; //default Constructor     
   }

};

Initialization for Array:

unsigned char array[5];

array[0]='A';

array[2]='C';

answered Oct 22, 2010 at 12:27

vrbilgi

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