Re: Proper way to declare a static const object in a class

Alex Blekhman <xfkt@oohay.moc>
Sun, 08 Oct 2006 12:10:32 +0200
Stick wrote:


Basically, I am creating a class that draws a single line of GDI+ text.

Right now I'm doing it like this:

void DisplayLine::Draw(Graphics *pGraphics)
  if(pGraphics != NULL)
      Font font_big (L"FIXEDSYS", 18, FontStyleBold, UnitPixel);
      Font font_small (L"FIXEDSYS", 12, FontStyleBold, UnitPixel);
      StringFormat sFormat = new StringFormat();
      SolidBrush grnbrush(Color((int)(brightness * 2.55), textRed,
textGreen, textBlue));


      wchar_t buf[20+1] = { 0 };
      MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, lineText.c_str(),
(int)lineText.length(), buf, 20);
      pGraphics->DrawString(buf, -1, &font_big, lineRect, &sFormat,

This works fine, but given that the Gdiplus::SolidBrush, for example, is
going to be the same used by all instances I'd really like to make it a
static variable in the class.

What would the class declaration (and constructor) for this look like? I
had problems because it is a constant. I really want to do the same with the

It should be like that:

// ----- header file -----

class DisplayLine
     // ....

     // declaration of static member
     static const SolidBrush s_solidBrush;

// -----------------------

// ------ source file -------

// definition of static member
const SolidBrush DisplayLine::s_solidBrush(/*whatever*/);

// --------------------------

In the same manner you declare and define `Font' objects.


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