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using static var from function outside the functionbody

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Im using a static variable from a funktion outside the funktion.
[SOURCE]
int *foo()
{
 static int i;
return &i;
}

int *i = foo();
*i = 1;

[/SOURCE]
Is there any danger doing this?

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Not really. You may get problems doing that in destructors of global or other static objects.

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Dangers:

1) Obvious: Don't try and delete the returned value. Return a reference instead to indicate the function owns it.

2) Pernicious: Global data can destroy your design.

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