Accessibility confusion



  • If code was personified, this'd be a lawsuit waiting to happen:
    [code]
    class SomeWidget
    {
    public:
    class HelperClass;
    SomeWidget(HelperClass &helper, /* args /);
    /
    ... /
    private:
    class HelperClass { /
    ... / };
    /
    ... */
    };
    [/code]



  • What that even does?



  • Better yet, is that a programming language or some weird psude-code you just invented?

    TIL you can write C++ code like that... I wonder if Java... nope. Seems like a nice feature to have. Where's my JSR proposal template?



  • @cartman82 said:

    What that even does?

    It's invalid C++ that provokes a ‘class 'SomeWidget::HelperClass’ redeclared with different access compiler error in a conformant compiler. Quoth ISO 14882:2011 (11.1p4, I'm pulling from the N3337 working draft though):

    When a member is redeclared within its class definition, the access specified at its redeclaration shall be the same as at its initial declaration. [*Example:* [code] struct S { class A; enum E : int; private: class A { }; // error: cannot change access enum E: int { e0 }; // error: cannot change access }; [/code]*—end example*]

    @Eldelshell said:

    TIL you can write C++ code like that

    Yes, this is supposedly-C++. See above.

    @Eldelshell said:

    I wonder if Java... nope. Seems like a nice feature to have. Where's my JSR proposal template?

    MUHAHAHAHAHA! :stuck_out_tongue_winking_eye: The evil ideas thread is :arrow_right_hook: :arrow_lower_right: that way though.


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