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move the two item visitors to the queries they always were

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forEachEmergingItem and forEachIncomingItem took a const FactoryState& and
touched no member of BuildingSystem: they read the state and the free geometry
helpers and nothing else. They are queries wearing a system's uniform, and their
one caller -- the renderer -- reached through getBuildings() to call them,
passing the state back in as an argument.

They move to FactoryQueries beside the rest of the read surface, and the renderer
calls them directly. With that, BuildingSystem answers no queries at all: its
const accessor on Simulation and on ArenaSimulation had no other user, so both
are gone. Nothing outside the command path can now reach the system.

No behaviour changes; the bodies move verbatim apart from two arrows in comments
that were non-ASCII.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ne3mejABZoLWKLh8fgpM3x
This commit is contained in:
Malte Langkabel
2026-08-19 17:07:17 +02:00
parent 5f41bd6855
commit a783e57731
9 changed files with 67 additions and 85 deletions
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22
src/lib/sim/BuildingSystem.h
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@@ -108,24 +108,10 @@ public:
// (REQ-MAT-OUTPUT-EMERGE).
void tickOutputBelts(FactoryState& state);
// -- Queries -------------------------------------------------------------
// Reading the factory needs no system: those queries are free functions over the
// state (FactoryQueries.h), the placement rules (PlacementRules.h) and the
// production rules (ProductionRules.h). Only the two visitors below are still
// here, and only because their callers reach them through this system.
// Visits every item currently emerging from a building output port on its
// virtual output belt (REQ-MAT-OUTPUT-EMERGE), passing the item type and its
// world-space centre (in tile units). Least-progressed first (drawn bottom) so
// callers can paint in visit order (REQ-GW-TILE-SIZE ordering).
void forEachEmergingItem(const FactoryState& state,
const std::function<void(const ItemType&, QPointF)>& visit) const;
// Visits every item currently travelling inward on a building input port's
// virtual input belt (REQ-MAT-INPUT-INTAKE), passing the item type and its
// world-space centre (in tile units). Least-progressed first (drawn bottom).
void forEachIncomingItem(const FactoryState& state,
const std::function<void(const ItemType&, QPointF)>& visit) const;
// This system answers no queries: reading the factory needs none, the queries being
// free functions over the state (FactoryQueries.h), the placement rules
// (PlacementRules.h) and the production rules (ProductionRules.h). What is left here
// mutates.
// Rotate an existing building or construction site to newRotation in place.
// For belt-type operational buildings, re-registers with BeltSystem (items