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March 21, 2020 Why are class variables public, when marked by the 'private' keyword? | ||||
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I was playing around with visibility attributes in D. I created a class with private variables. Then I tried to access those variables through the class object. It compiled without any errors. However, ... Shouldn't the compiler output an error for trying to access private members of a class? Do I get something wrong? Here is the code: import std.stdio; class ID { public: int id = 3849493; private: string name = "Julia"; int age = 17; }; void main() { ID p = new ID(); writeln(p.name, " ", p.age, " ", p.id); } |
March 21, 2020 Re: Why are class variables public, when marked by the 'private' keyword? | ||||
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Posted in reply to Kirill | On Saturday, 21 March 2020 at 04:45:29 UTC, Kirill wrote:
> I was playing around with visibility attributes in D. I created a class with private variables. Then I tried to access those variables through the class object. It compiled without any errors. However, ...
>
> Shouldn't the compiler output an error for trying to access private members of a class? Do I get something wrong?
>
> Here is the code:
>
> import std.stdio;
>
> class ID {
> public:
> int id = 3849493;
> private:
> string name = "Julia";
> int age = 17;
> };
>
> void main() {
> ID p = new ID();
>
> writeln(p.name, " ", p.age, " ", p.id);
> }
In D, the unit of encapsulation is the module. So private means "private to the module", i.e., private members are accessible within the same module. If ID were in a different module from main, you would see an error.
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March 21, 2020 Re: Why are class variables public, when marked by the 'private' keyword? | ||||
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Posted in reply to Mike Parker | On Saturday, 21 March 2020 at 04:58:32 UTC, Mike Parker wrote:
> In D, the unit of encapsulation is the module. So private means "private to the module", i.e., private members are accessible within the same module. If ID were in a different module from main, you would see an error.
Indeed, I read something like this somewhere... It makes sense to me now! Thank you!
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