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84 lines
2.1 KiB
C++
84 lines
2.1 KiB
C++
// Created on: 2009-09-23
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// Copyright (c) 2009-2012 OPEN CASCADE SAS
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//
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// The content of this file is subject to the Open CASCADE Technology Public
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// License Version 6.5 (the "License"). You may not use the content of this file
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// except in compliance with the License. Please obtain a copy of the License
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// at http://www.opencascade.org and read it completely before using this file.
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//
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// The Initial Developer of the Original Code is Open CASCADE S.A.S., having its
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// main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France.
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//
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// The Original Code and all software distributed under the License is
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// distributed on an "AS IS" basis, without warranty of any kind, and the
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// Initial Developer hereby disclaims all such warranties, including without
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// limitation, any warranties of merchantability, fitness for a particular
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// purpose or non-infringement. Please see the License for the specific terms
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// and conditions governing the rights and limitations under the License.
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#ifndef _PLib_LocalArray_HeaderFile
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#define _PLib_LocalArray_HeaderFile
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#include <Standard.hxx>
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#include <Standard_TypeDef.hxx>
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//! Auxiliary class optimizing creation of array buffer for
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//! evaluation of bspline (using stack allocation for small arrays)
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class PLib_LocalArray
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{
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public:
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// 1K * sizeof (double) = 8K
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static const size_t MAX_ARRAY_SIZE = 1024;
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PLib_LocalArray (const size_t theSize)
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: myPtr (myBuffer)
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{
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Allocate(theSize);
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}
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PLib_LocalArray()
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: myPtr (myBuffer) {}
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virtual ~PLib_LocalArray()
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{
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Deallocate();
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}
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void Allocate (const size_t theSize)
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{
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Deallocate();
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if (theSize > MAX_ARRAY_SIZE)
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myPtr = (Standard_Real*)Standard::Allocate (theSize * sizeof(Standard_Real));
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else
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myPtr = myBuffer;
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}
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operator Standard_Real*() const
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{
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return myPtr;
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}
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private:
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PLib_LocalArray (const PLib_LocalArray& );
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PLib_LocalArray& operator= (const PLib_LocalArray& );
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protected:
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void Deallocate()
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{
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if (myPtr != myBuffer)
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Standard::Free (*(Standard_Address*)&myPtr);
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}
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protected:
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Standard_Real myBuffer[MAX_ARRAY_SIZE];
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Standard_Real* myPtr;
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};
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#endif
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