I have a question about initialize of the class static member variable.

I Have a static member variable like this:

// A.h
class A
{
    static int m_nStaticVar[1000];
};

If I want to initialize this static array to ZERO.
I can do this.

// A.cpp
int A::m_nStaticVar = { 0 };

the compiler can put the variable to .data section and set the array to
ZERO.

but now I don't want to initialize ZERO, I want to initialize 0x999.

How to do ?

--------------
I only knew a way like this;

class A
{
  staitc int m_na[1000];
  static bool init( );
  static bool m_bInit;
};

int A::m_na[1000];
bool A::m_bInit = A::init();
bool A::init()
{
   for ( int i=0;i<1000;++i )
   {
       A::m_na[i] = 0x999;
   }
}


Can you give me a better way ??


thank you very much.

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> Can you give me a better way ??

I'm just working off the cuff here, but I'd probably do something like this:

template<class T>
class InitValue
{
    template<T value>
    class Value
    {
        public:

            T object;

            Value() : object(value) { }
    };
};

#include <iostream>
using std::cout; using std::cin; using std::endl;

int main()
{
    InitValue<int>::Value<999> array[1000];

    for( int i = 0; i < 1000; ++i )
    {
        cout << array[i].object << endl;
    }
}


You can do all sorts of fancy stuff like make an "operator T" for
"InitValue", but the above code does the trick.

-Tom   s

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madmanahong wrote:
> I have a question about initialize of the class static member variable.

> I Have a static member variable like this:

> // A.h
> class A
> {
>     static int m_nStaticVar[1000];
> };

> If I want to initialize this static array to ZERO.
> I can do this.

> // A.cpp
> int A::m_nStaticVar = { 0 };

> the compiler can put the variable to .data section and set the
> array to ZERO.

> but now I don't want to initialize ZERO, I want to initialize 0x999.

> How to do ?

What's wrong with the obvious solution:

    int A::m_nStaticVar = {
        0x999, 0x999, 0x999, 0x999, 0x999 ...
    } ;

Obviously, you don't want to have to type it in manually, but it
should be quick work to write a program to generate it.  Or even
with macros:

    #define Times5( n ) n, n, n, n, n,
    #define Times10( n ) Times5( n ) Times5( n )
    #define Times100( n ) Times10( Times10( n ) )
    #define Times1000( n ) Times100( Times10( n ) )

    int A::m_nStaticVar = {
        Times1000( 0x999 )
    } ;

Of course, if you use an std::vector, it's even easier.  I'd say
that this is the preferred solution, unless order of
construction issues are involved.

--
James Kanze                                           GABI Software
Conseils en informatique orient   e objet/
                   Beratung in objektorientierter Datenverarbeitung
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