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<div class="moz-cite-prefix">Am 24.09.2013 11:25, schrieb Sven
Barth:<br>
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<div class="moz-cite-prefix">Am 24.09.2013 11:19, schrieb
Xiangrong Fang:<br>
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<div>Hi All,<br>
<br>
say, I have a class TTree<T>; in the destructor of
that class, is it possible to know the actual type of T?
I want to do things like:<br>
<span style="font-family:courier new,monospace"><br>
</span></div>
<span style="font-family:courier new,monospace">generic
TTree<T> = class<br>
</span></div>
<div><span style="font-family:courier new,monospace">public<br>
</span></div>
<div><span style="font-family:courier new,monospace"> Data:
T;<br>
</span></div>
<div><span style="font-family:courier new,monospace">
destructor Destroy; override;<br>
</span></div>
<span style="font-family:courier new,monospace">end;<br>
<br>
</span></div>
<div><span style="font-family:courier new,monospace">destructor
TTree.Destroy;<br>
</span></div>
<div><span style="font-family:courier new,monospace">begin<br>
... ...<br>
</span></div>
<div><span style="font-family:courier new,monospace"> if Data
is TObject then Data.Free;<br>
</span></div>
<div><span style="font-family:courier new,monospace">end;<br>
</span></div>
<div><br>
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<div>But "is" does not work with generic types.<br>
<br>
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Short answer: No<br>
Long answer: You could try to use TypeInfo(Data) or TypeInfo(T)
and use the returned PTypeInfo to find out the type...<br>
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But it's not a good idea as you'd still need to convert Data to a
TObject (e.g. by using a cast), but that will fail if Data is
something else than a pointer-like type...<br>
<br>
Regards,<br>
Sven<br>
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