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-rw-r--r--src/serverenvironment.h5
1 files changed, 2 insertions, 3 deletions
diff --git a/src/serverenvironment.h b/src/serverenvironment.h
index 0e31aa41a..7c370fd54 100644
--- a/src/serverenvironment.h
+++ b/src/serverenvironment.h
@@ -51,11 +51,10 @@ public:
virtual ~ActiveBlockModifier(){};
// Set of contents to trigger on
- virtual std::set<std::string> getTriggerContents()=0;
+ virtual const std::set<std::string> &getTriggerContents() const = 0;
// Set of required neighbors (trigger doesn't happen if none are found)
// Empty = do not check neighbors
- virtual std::set<std::string> getRequiredNeighbors()
- { return std::set<std::string>(); }
+ virtual const std::set<std::string> &getRequiredNeighbors() const = 0;
// Trigger interval in seconds
virtual float getTriggerInterval() = 0;
// Random chance of (1 / return value), 0 is disallowed