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From ydavid@dxds01.cern.ch Thu Oct  1 10:19:41 1992
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Date: Thu, 1 Oct 92 10:19:26 +0100
From: ydavid@dxds01.cern.ch (David Yann)
Message-Id: <9210010919.AA10785@dxds01.cern.ch>
To: ydavid@dxcern.cern.ch
Status: R

		Hi there !


I am currently in the process of learning C++ and I have some difficulty 
using static class variables (when compiling my .C files with gcc).
It seems that the linker does not recognize those static variables.
For example, the following program:


  // Some difficulty using static class variables (& functions)

  #include <stream.h>

  class MyClass
  {	static int a=0;
    public:
	void incA();
  };

  void MyClass::incA()
  {	a+=1;
	cout<<a;
  }


  main()
  {	MyClass ex;
	ex.incA();
	ex.incA();
  }


comes up with the following message:

  ld:
  Undefined:
  _7MyClass$a
  collect: /usr/bin/ld returned 1 exit status

which I don't understand.

Thank you in advance for your help!

Yann DAVID, student at CERN.


NB: I work on a DEC workstation, under ULTRIX.