Assign values to arrays in structs

Question

I am using a struct that, within it, it has an array of pointers to other structs of the same type. How do I assign that array at design time to have multiple elements?

Example:

struct structx {
int value;
structx *pChild[];
};

void funcY(hasChild*, int);

struct structx noChild = { 1, NULL };

struct structx otherNoChild = { 2, NULL };

struct structx childHaver = {
3,
&noChild
};

struct structx parent = {
4,
&childHaver
};

int _tmain(int argc, _TCHAR* argv[])
{
funcY(&parent, 0);

cout << endl;

funcY(&childHaver, 0);

system("pause");
return 0;
}

void funcY(hasChild* child, int childPosition)
{
if (child->pChild[0] != NULL)
{
    funcY(child->pChild[childPosition], childPosition);
}
cout << child->value << endl;
}

This code is for C++ in visual studio 2008.

When I use this code, it works just fine, and prints 1, 3, 4.

However, if I try to put multiple addresses into the struct, like so:

struct structx parent = {
4,
(&childHaver, &noChild)
};

It despite sending in position 0, it will select &noChild, which should be the next position in the array.

Is there a special way to do this in the syntax that I'm missing?

Is it a requirement that you use an array of pointers to structx? Can you use std::vector<struct*> instead? — R Sahu
– R Sahu, Commented Jun 5, 2014 at 16:55
(&childHaver, &noChild) is using the comma operator, not passing multiple things. And that struct hack isn't valid C++. — Qaz
– Qaz, Commented Jun 5, 2014 at 16:58
Vectors might work, but it depends on my Head of Development. He doesn't like them. What's the syntax for passing multiple things? — user3215251
– user3215251, Commented Jun 5, 2014 at 17:03

excray · Accepted Answer · 2014-06-05 17:09:25Z

1

Use the curly braces for initializing the array of structs.

struct structx parent = {
4,
{&childHaver, &noChild}
};

answered Jun 5, 2014 at 17:09

excray

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