21
Dec
Unions in C++
Related Blog Items
Default access to a union is public, it can contain member functions and member data.
Other than that there are some more specialties for unions in C++.
- It can’t have a static data members or a member of reference type.
- It can’t have virtual functions.
- It can’t be used as a base class nor it can have base class.
- An object of a class with a construct or a destructor or a user-defined assignment operator cannot be a member of a union
Global Anonymous Unions
An anonymous union that is declared in a named namespace or in the global namespace has to be explicitly declared static. For example
static union //anonymous union in global namespace
{
int num;
char *pc;
};
namespace NS
{
static union { double d; bool b;}; //anonymous union in a named namespace
}
int main()
{
NS::d = 0.0;
num = 5;
pc = "str";
return 0;
}
[tags]unions, C++ unions, union basics, unions information, global anonymous unions[/tags]
Popularity: 4%
You need to log on to convert this article into PDF
Related Blog Items
Related Blog Items
No Comments
No comments yet.
