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C++: weird const struct problem

Started by Castaa Mar 13, 2009 at 3:51 PM 1 replies 700+ views

Original Post

Mar 13, 2009 at 3:51 PM

// file.h class foo { const struct _Data { int a; int b; } Data; }; --- // file.cpp const foo::_Data Data = { 1, 2 }; --- This throws an compile error: error C2248: '_Data' : cannot access private struct declared in class 'foo' How do I assign the const values of Data? (If I define "struct _Data" as public is compiles but ideally I don't want it public)

Brother Bob

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218

Brother Bob

Mar 13, 2009 at 4:03 PM

I'm not sure what exactly it is you're trying to do here. Do you want to create an object of type foo::_Data (which is what you do in the line giving you the error), or initialize the member Data in some object of tyoe foo?

First one you cannot do, unless you're in a member function of foo. Since only foo have access to its private symbols, you cannot access _Data from outside foo.

Second one is what you use the constructor for; to initialize the members.

class foo{public:	foo() : Data() {}private:	const struct _Data {        _Data() : a(1), b(42) {}        int a;        int b;    } Data;};

Castaa

Author

Castaa

Mar 13, 2009 at 4:39 PM

You are spot on. That's what I need to do. Thanks.

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