[cfe-dev] Error Accessing friend Methods

[Richard Smith via cfe-dev]

Your code example has several other errors in it, can you provide us with
the actual code that produced the reported error?
On Dec 13, 2015 10:52 AM, "Uri Mann via cfe-dev" <cfe-dev at lists.llvm.org>
wrote:

> I have the following code:
> // header1.h
> class Infc;
> template<typename Type>
> struct Struct {
>         Infc* _infc;
>         Struct(Infc* infc) : _infc(infc) {}
>         ~ Struct() { _infc->destroy(this); }
> };
>
> // header2.h
> template<typename> friend struct Struct;
> class Infc {
> public:
>         virtual void create() = 0;      // For everyone
> private:
>         template<typename> friend struct Struct;
>         virtual void destroy(void* _this) = 0;  // Only for friends
> };
>
> // source.cpp
> #include "header1.h"
> #include "header2.h"
> Infc* g_infc;
> void f() {
>         Struct s(g_infc);
> }
>
> CLANG issue the following error:
> 1>  In file included from source.cpp:
> 1>header1.h: error : 'destroy' is a private member of 'Infc'
> 1>      ~ Struct() { _infc->destroy(this); }
> 1>                      ^
> 1>  header2.h :  note: declared private here
> 1>      virtual void destroy(void* _this) = 0;
> 1>                   ^
>
> What am I doing wrong? Why is the friendship not recognized?
>
> Many thanks in advance.
> -Uri
>
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