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tiv
2b2be3fb82
0030551: Foundation Classes - Integer overflow in NCollection_CellFilter HashCode Signed integers are not used in hash code functions now to prevent undefined behavior on left shift operations with signed integers. A possibility of negative values of hash codes is eliminated. INT_MAX → IntegerLast() in hash code functions. All found hash code functions behaves uniformly now: they return a value in the range [1, theUpperBound]. Relevant comments are added to such functions.
79 lines
2.2 KiB
C++
79 lines
2.2 KiB
C++
// Created on: 1994-11-04
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// Created by: Christian CAILLET
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// Copyright (c) 1994-1999 Matra Datavision
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// Copyright (c) 1999-2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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#ifndef _Transfer_FindHasher_HeaderFile
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#define _Transfer_FindHasher_HeaderFile
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#include <Standard.hxx>
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#include <Standard_DefineAlloc.hxx>
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#include <Standard_Handle.hxx>
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#include <Standard_Integer.hxx>
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#include <Standard_Boolean.hxx>
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class Transfer_Finder;
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//! FindHasher defines HashCode for Finder, which is : ask a
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//! Finder its HashCode ! Because this is the Finder itself which
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//! brings the HashCode for its Key
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//!
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//! This class complies to the template given in TCollection by
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//! MapHasher itself
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class Transfer_FindHasher
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{
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public:
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DEFINE_STANDARD_ALLOC
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//! Returns hash code for the given finder, in the range [1, theUpperBound].
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//! Asks the finder its hash code, then transforms it to be in the required range
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//! @param theFinder the finder which hash code is to be computed
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//! @param theUpperBound the upper bound of the range a computing hash code must be within
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//! @return a computed hash code, in the range [1, theUpperBound]
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Standard_EXPORT static Standard_Integer HashCode (const Handle (Transfer_Finder) & theFinder,
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Standard_Integer theUpperBound);
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//! Returns True if two keys are the same.
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//! The test does not work on the Finders themselves but by
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//! calling their methods Equates
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Standard_EXPORT static Standard_Boolean IsEqual (const Handle(Transfer_Finder)& K1, const Handle(Transfer_Finder)& K2);
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protected:
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private:
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};
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#endif // _Transfer_FindHasher_HeaderFile
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