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From "Travis Vitek" <Travis.Vi...@roguewave.com>
Subject RE: question about aligned_storage
Date Thu, 26 Jun 2008 20:50:21 GMT
 

Martin Sebor wrote:
>
>Travis Vitek wrote:
>>
>> Here is a testcase...
>> 
>>   $ cat z.cpp && g++ --version && g++ -c z.cpp
>> 
>>   template <int N, int A>
>>   struct __rw_aligned_storage { 
>>       typedef struct {
>>           char _C_align [N] __attribute__ ((aligned (A)));
>>       } type;
>>   };
>> 
>>   __rw_aligned_storage<10, 4>::type aligned_t;
>> 

[...]

>> 
>>   z.cpp: In instantiation of '__rw_aligned_storage<10, 4>::type':
>>   z.cpp:9:   instantiated from here
>>   z.cpp:5: error: requested alignment is not a constant
>> 
>> If I can't access the member type 'type', then the feature 
>> is useless. The nested type is the only thing that is aligned.
>> If you are sure that this will work with gcc-4.3, please show
>> me where I've gone wrong.
>
>Isn't it obvious? You're missing a set of parentheses around A ;-)
>This works for me:
>
>   template <int N, int A>
>   struct __rw_aligned_storage {
>       typedef struct {
>           char _C_align [N] __attribute__ ((aligned ((A))));
>       } type;
>   };
>
>   __rw_aligned_storage<10, 4>::type aligned_t;
>
>> 
>> Travis
>>

Darn you Martin Sebor! Well now that I have a workaround, I can do it
the easy way (on one compiler).

Travis

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