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Access to a private reference? #12

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blackbox-tech opened this issue Mar 28, 2023 · 2 comments
Closed

Access to a private reference? #12

blackbox-tech opened this issue Mar 28, 2023 · 2 comments

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@blackbox-tech
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Awesome little header, is there a way to access a private member that is a reference?

It's not listed as a limitation, but I could not find a test for it.

I did some experiments in g but I got some compilation errors, for example:

struct A {
public:
    A() : foo(99), bar(foo) {}
private:
    int foo;
    int& bar;
};

ACCESS_PRIVATE_FIELD(A, int, bar)  // error: cannot create pointer to reference member
ACCESS_PRIVATE_FIELD(A, int&, bar) // error: cannot declare pointer to 'using Alias_PrivateAccessTag0 = int&' {aka 'int&'}

int& x = access_private::bar(a);
@blackbox-tech
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I guess the answer is you can't as bar may not use any storage (like here is an alias for foo), so you can't uses its address to specialize the template?

@martong
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martong commented Mar 30, 2023

Hey, thank you for bringing this up. I believe that your conclusion is correct, a pointer to reference is illegal in C , thus we cannot instantiate the "getter" template. I'll update the limitations section.

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@martong @blackbox-tech