97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
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/*
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*
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* Copyright (C) 2014, OFFIS e.V.
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* All rights reserved. See COPYRIGHT file for details.
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*
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* This software and supporting documentation were developed by
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*
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* OFFIS e.V.
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* R&D Division Health
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* Escherweg 2
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* D-26121 Oldenburg, Germany
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*
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*
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* Module: ofstd
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*
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* Author: Jan Schlamelcher
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*
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* Purpose:
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* Implementing the explicit boolean type OFExplicitBool.
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*
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*/
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#ifndef OFEXBL_H
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#define OFEXBL_H
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#include "dcmtk/config/osconfig.h" /* make sure OS specific configuration is included first */
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#include "dcmtk/ofstd/oftraits.h"
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/** Helper class for resolving overloaded functions.
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* OFExplicitBool can be used to restrict an overloaded function's
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* parameter to "real" OFBool values, e.g. pointers and numeric values
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* can NOT be converted to OFExplicitBool implicitly.
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* @note OFBool falls back to "int" on platforms that don't support
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* the keyword "bool". Therefore the conversion of int values to
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* OFExplicitBool can't be prevented on those platforms.
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*/
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class OFExplicitBool
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{
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public:
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#ifndef DOXYGEN
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// copy constructor
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inline OFExplicitBool( const OFExplicitBool& rhs )
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: m_Value( rhs.m_Value ) {}
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// generic constructor accepting only real OFBool values
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// distinguished via SFINAE
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template<typename Bool>
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inline OFExplicitBool( Bool value,
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typename OFenable_if
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<
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OFis_same
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<
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OFBool,
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typename OFdecay<Bool>::type
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>::value
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>::type* = OFnullptr )
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: m_Value( value ) {}
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#else
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/** Construct an OFExplicitBool object from an explicit OFBool value.
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* @param value either OFTrue or OFFalse.
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* @note "explicit OFBool" is not a valid C++ type. It's just a term
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* to explain the concept of OFExplicitBool, that is realized by
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* SFINAE mechanisms in reality.
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*/
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inline OFExplicitBool( explicit OFBool value );
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#endif
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/** Implicit conversion to OFBool.
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* This allows to use OFExplicitBool like a normal OFBool value,
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* for example in if-statements.
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*/
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inline operator OFBool() const
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#ifndef DOXYGEN
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{ return m_Value; }
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#else
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;
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#endif
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/** Negation operator.
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* This allows to negate OFExplicitBool like a normal OFBool value,
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* for example to use the negated value in if-statements.
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*/
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inline OFBool operator!() const
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#ifndef DOXYGEN
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{ return !m_Value; }
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#else
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;
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#endif
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private:
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/// The underlying boolean value.
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OFBool m_Value;
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};
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#endif // OFEXBL_H
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