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-rw-r--r--src/newgrf_commons.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/newgrf_commons.h b/src/newgrf_commons.h
index ad1c8f408..99a124caa 100644
--- a/src/newgrf_commons.h
+++ b/src/newgrf_commons.h
@@ -301,6 +301,8 @@ uint32 GetCompanyInfo(CompanyID owner, const struct Livery *l = NULL);
CommandCost GetErrorMessageFromLocationCallbackResult(uint16 cb_res, uint32 grfid, StringID default_error);
void ErrorUnknownCallbackResult(uint32 grfid, uint16 cbid, uint16 cb_res);
+bool ConvertBooleanCallback(const struct GRFFile *grffile, uint16 cbid, uint16 cb_res);
+bool Convert8bitBooleanCallback(const struct GRFFile *grffile, uint16 cbid, uint16 cb_res);
/**
* Data related to the handling of grf files.