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[Fòram na Gàidhlig <fios@xxxxxxxxxxxxxxxxxxx>]

Upcast does not change the const/pointer/reference types, just the class
type. From this code snippet, I can't tell where the const or & comes from.



Sgrìobh Tibor Bamhor na leanas 25/06/2015 aig 14:36:
> Hi,
> 
> I am searching for near bobs and putting them to 
> 
> std::vector<Bob *> own_nearby;
> 
> then iterate over it and if the bob is soldier (and meets some other
> requirements) I need to put it to 
> 
> std::vector<Soldier *> defending_soldiers;
> 
> The relevant part of code is:
> 
> for (Bob * own : own_nearby) {
> if (upcast(Soldier, ownSoldier, own)) {
> if (ownSoldier->is_defending()){
> defending_soldiers.back(ownSoldier);
> }
> }
> }
> 
> But it complains during compilation:
> 
>  error: no matching function for call to 'std::vector<const
> Widelands::Soldier*>::back(Widelands::Soldier* const&)'
>        defending_soldiers.back(ownSoldier);
> 
> If I understand it correctly (if at all :) ) the upcast is making const
> from soldier... how to circumvent it? defending_soldiers vector is to be
> shortliving, immediately forgotten....
> 
> Ideas? :)
> 
> Tibor
> 
> 
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> Version: 2015.0.6037 / Virendatenbank: 4365/10094 - Ausgabedatum:
> 25.06.2015
> 

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