[cfe-dev] early instantiation of defaulted copy constructor

[Nathan Ridge]

> Hello, 
>  
> The following code fails to compile with Clang trunk: 
>  
> template <class T, class U> 
> struct pair 
> { 
>      T first; 
>      U second; 
>  
>      pair() : first(), second() {} 
>  
>      pair(const pair&) = default; 
> }; 
>  
> struct S 
> { 
>      S() {} 
>      S(const S&) = delete; 
>      S(S&&) = default; 
> }; 
>  
> int main() 
> { 
>      pair<int, S> p; 
> } 
>  
> The errors are: 
>  
> test.cpp:9:5: error: the parameter for this explicitly-defaulted copy  
> constructor is const, but a member or base requires it to be 
>        non-const 
>      pair(const pair&) = default; 
>      ^ 
> test.cpp:21:18: note: in instantiation of template class 'pair<int, S>'  
> requested here 
>      pair<int, S> p; 
>                   ^ 
>  
> Thanks for the report! This issue was fixed over a week ago. Trunk  
> clang accepts your code.

Ok, cool! Will it be fixed in the 3.1 branch?

Thanks,
Nate