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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef itkStdStreamStateSave_h
#define itkStdStreamStateSave_h
#include <iostream>
#include <string>
#include "itkMacro.h"
namespace itk
{
/** \class StdStreamStateSave
*
* \brief Save a stream's format state and restore it upon destruction
*
* An RAII class to provide an exception safe mechanism to restore the
* format state of a stream. The class holds a resource (the stream's
* format state) and resets the resource to a default state upon destruction.
*
* Typical usage:
\code{.cpp}
itk::StdStreamStateSave coutState(std::cout);
std::cout.precision(20);
std::cout.hex();
...
return;
\endcode
*
* \ingroup ITKCommon
*/
class StdStreamStateSave
{
public:
explicit StdStreamStateSave(std::ios& stream) :
m_Ios(stream),
m_State(ITK_NULLPTR)
{
m_State.copyfmt(stream);
}
~StdStreamStateSave()
{
m_Ios.copyfmt(m_State);
}
private:
ITK_DISALLOW_COPY_AND_ASSIGN(StdStreamStateSave);
std::ios& m_Ios;
std::ios m_State;
};
}
#endif
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