add cv qualifier to parameter

alib2data/src/alphabet/UniqueSymbol.cpp

@@ -11,7 +11,7 @@
 namespace alphabet {
-UniqueSymbol::UniqueSymbol(const Symbol& symbol, primitive::Integer& id) : symbol(symbol), id(id) {
+UniqueSymbol::UniqueSymbol(const Symbol& symbol, const primitive::Integer& id) : symbol(symbol), id(id) {
 }

alib2data/src/alphabet/UniqueSymbol.h

@@ -31,7 +31,7 @@ public:
 	 * Creates new symbol with given name.
 	 * @param symbol name of the symbol
 	 */
-	explicit UniqueSymbol(const Symbol& symbol, primitive::Integer& id);
+	explicit UniqueSymbol(const Symbol& symbol, const primitive::Integer& id);
 	virtual SymbolBase* clone() const;