Re: "static const" attribute in C++ (How to ?)

[Luciano Moreira - igLnx <lucianolnx@ig.com.br>]

Yes ! It was my solution.

Luciano

Dinesh Ahuja wrote:

>Hi Henry,
>
>There is a concept of constant folding in C++.
>Whenever you declare any data member of class as a
>constant, the compiler should allocate the memory for
>it in the object layout and compiler should know the
>size of the variable in advance. Suppose, if I have a
>class like below :
>class MyClass {
>   const int size;
>   int arrSize[size];
>};
>This will not compile because compiler can not do the
>constant folding in above case as memory needs to be
>allocated for the constant data member size.
>
>The above problem can be resolved by using enums.
>class MyClass {
>   enum {size = 100};
>   int arrSize[size];
>};
>
>This will work as enum doesn't have any linkage and
>hence no memory is allocated for them. Even use of
>extern keyword prevents constant folding for a
>constant variable.
>
>I hope the above thing may have helped you.
>
>Thanks & Regards
>Dinesh-Ahuja
>
>  
>
>>>Henry Margies wrote:
>>>Just put the definition in the cpp file.
>>>Header File:
>>>class Foo
>>>{
>>>	public:
>>>		static const int DEFSIZE;
>>>};
>>>
>>>in CPP-File:
>>>
>>>const int Foo::DEFSIZE=100
>>>
>>>Why does this not work for you?
>>>
>>>Henry
>>>      
>>>
>
>
>
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>  
>