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struct + writeln
Nov 18, 2012
Namespace
Nov 18, 2012
bearophile
Nov 18, 2012
Artur Skawina
November 18, 2012
Gravatar of NamespacePosted by NamespaceReply
Namespace
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Why are there so many copies of my struct if I give it to writeln?
http://dpaste.dzfl.pl/414e7d93
This problem occurs even if I have a 'toString' method.
November 18, 2012
Gravatar of bearophilePosted by bearophile
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bearophile
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Namespace:

> Why are there so many copies of my struct if I give it to writeln?
> http://dpaste.dzfl.pl/414e7d93
> This problem occurs even if I have a 'toString' method.

It looks the compiler is working correctly here. It seems a pure Phobos/writeln problem.

Bye,
bearophile
November 18, 2012
Gravatar of Artur SkawinaPosted by Artur Skawina
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Artur Skawina
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On 11/18/12 14:15, Namespace wrote:
> Why are there so many copies of my struct if I give it to writeln?
> http://dpaste.dzfl.pl/414e7d93
> This problem occurs even if I have a 'toString' method.

phobos/writeln design issue. It just always blindly copies the things
it needs to print/format. Unnecessary copies is not even that big a problem
compared to what happens when the struct contains pointers and a non-trivial
toString method...

artur