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-rw-r--r--src/cargotype.cpp6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/cargotype.cpp b/src/cargotype.cpp
index 0cfd7e2e9..28fbce38b 100644
--- a/src/cargotype.cpp
+++ b/src/cargotype.cpp
@@ -67,3 +67,9 @@ CargoID GetCargoIDByBitnum(byte bitnum)
assert(_cargo_bitnum_map[bitnum] != CT_INVALID);
return _cargo_bitnum_map[bitnum];
}
+
+
+bool CargoSpec::IsValid() const
+{
+ return bitnum != INVALID_CARGO;
+}