[fpc-pascal] Problems with assigning pointers

dhkblaszyk at zeelandnet.nl dhkblaszyk at zeelandnet.nl
Tue Apr 10 18:08:04 CEST 2012


I have some issues when assigning a pointer to a pointer variable.
Consider this: 

 TVertex = record
 x: double;
 y: double;

PVertex = ^TVertex; 

 TEdge = record
 v1: PVertex;
 v2: PVertex;

I have assigned a value to a vertex variable. In my code I have an
array of TEdge. When I try to assign a vertex to the edge element in the
array the x value suddenly is changed to 3e-308 (or something similar).
I don't understand why, perhaps someone could help me to figure this
out.The code I'm using to assign the value is shown below. To my
knowledge assigning a pointer this way is perfectly legal not?

procedure add_edge(v1, v2: PVertex);

SetLength(edge_list, edge_count); 

 edge_list[edge_count - 1].v1 := v1;
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