Index: src/libchcore/IColumnsDefinition.h
===================================================================
diff -u -N -rffdee64cb0f2d472bb4102abe80ee12783e794c8 -r7b830c34855c8aaa81aac2c6e0ca0fa6bae95e66
--- src/libchcore/IColumnsDefinition.h	(.../IColumnsDefinition.h)	(revision ffdee64cb0f2d472bb4102abe80ee12783e794c8)
+++ src/libchcore/IColumnsDefinition.h	(.../IColumnsDefinition.h)	(revision 7b830c34855c8aaa81aac2c6e0ca0fa6bae95e66)
@@ -52,8 +52,8 @@
 	virtual size_t AddColumn(const TString& strColumnName, ETypes eColType) = 0;
 	virtual void Clear() = 0;
 
-	virtual size_t GetColumnIndex(const TString& strColumnName) = 0;
-	virtual TString GetColumnName(size_t stIndex) const = 0;
+	virtual size_t GetColumnIndex(const wchar_t* strColumnName) = 0;
+	virtual const TString& GetColumnName(size_t stIndex) const = 0;
 	virtual size_t GetCount() const = 0;
 	virtual bool IsEmpty() const = 0;
 };