why unions and structs couldnt be initialized ?

Howdy~

I just found when I want to initialize variables inside a union or struct compiler will report an error, why couldnt we do that ??? :rolleyes:

Either declare the members static (remember, unions can't have static members) or, create an object of the particular struct/union and initilize those variables.

Some code would help too.

Quote:

---

Originally posted by Eibro
Either declare the members static (remember, unions can't have static members) or, create an object of the particular struct/union and initilize those variables.

Some code would help too.

---

thanx. but I wonder why we couldnt initialize variable just as class ? :confused:

You can, but maybe not in a constructor as you may be thinking.
Post some code.

Quote:

---

Originally posted by Eibro
You can, but maybe not in a constructor as you may be thinking.
Post some code.

---

for example:

Code:

---

union myUnion
{
  int a=0;
  bool b;
  char c;
}

---

if we run this code will get an error, why couldnt we do that ???

You can specify a union constructor as you would with a struct or class....do so and set the member with the largest varible type to zero.

Code:

---

#include <iostream>


union myUnion
{
        myUnion():a(0){}
        int a;
        bool b;
        char c;
};

int main() {
       
        myUnion u;
       
        std::cout << "As int " << u.a << std::endl;
        std::cout << "As bool " << u.b << std::endl;
        std::cout << "As char " << u.c << std::endl;
}

---