[Insight-developers] ITK_EXPORT

[Luis Ibanez]

It seems to be important to add the ITK_EXPORT
symbol to every class that derives from one that
already uses this symbol.

Otherwise, VC++ creates duplicate versions of
some functions with a different calling convention.
This is not noted in the test files given that they
usualy are very short.

On the Examples, the applications use a higher number
of classes, and conflicts are more likely to occurr.

That results in runtime errors detected when checking
the stack. The message in VC++ is:


"The value of ESP was not properly saved across a function call.
 This is usually a result of calling a function declared with one
 calling convention with a function pointer declared with a
 different calling convention"





Luis