On 5/21/16 1:32 PM, dan wrote:
Is it possible to have a class which has a variable which can be seen
from the outside, but which can only be modified from the inside?
Something like:
class C {
int my_var = 3; // semi_const??
void do_something() { my_var = 4; }
}
And then in another file
auto c = new C();
c.my_var = 5; // <<<- should trigger a compile-time error
writeln("the value is ", c.my_var); // <<<- should print 3
c.do_something();
writeln("the value is ", c.my_var); // <<<- should print 4
Reading Alexandrescu's book suggests the answer is "no" (the only
relevant type qualifiers are private, package, protected, public, and
export, and none seem appropriate).
(This effect could be simulated by making my_var into a function, but i
don't want to do that.)
TIA for any info!
A while ago, I discovered that this works.
class C {
union
{
private int _my_var;
public const int my_var;
}
void do_something() { _my_var = 4; }
}
-Steve
