[okl4-developer] About C++ Global or Local variable.

[Geoffrey Lee]

On Thu, Oct 09, 2008 at 12:51:42PM +0900, 유호철 wrote:
> Hi all. 
> 
>   I asked about L4 C++ library porting already before. 
> 
>   Since, advanced the rate of progress ( so little...)
> 
>   At result, I succes c++ compile. c++ code following..........
> 
>   ----------------------------------------------------
> 
>   #include <stdlib.h>
> extern "C" void printf(char const*, ...);
> class CRectangle {
>     int width, height;
>   public:
>     CRectangle (int,int);
>     int area () {return (width*height);}
> };
> CRectangle::CRectangle (int a, int b) {
>   printf("constructor call.\n");
>   width = a;
>   height = b;
> }
> CRectangle rect1 (4,5);
> int main()
> {
>         CRectangle rect2 (3,4);
>         printf("rect1 : %d\n", rect1.area());
>         printf("rect2 : %d\n", rect2.area());
>         return 0;
> }
> 
> ----------------------------------------------------
> 
> [ execution result ]
> 
>  rect1 : 0
>  constructor call.
>  rect2 : 12
> 
> -----------------------------------------------------
> 
> Local variable rect2 initialize success. 
> 
> But, Global variable rect1 is not initialization.

Globals will probably need to have their constructors called
at initialization time (in crt0 or similar).

	-gl

> 
> If I talk differently, 
> 
> Local variable call constructor in creation. 
> 
> Bur, Global variable don`t. 
> 
> 
> any  thanks in advanced.

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