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/*
* Created by Phil on 02/12/2012.
* Copyright 2012 Two Blue Cubes Ltd. All rights reserved.
*
* Distributed under the Boost Software License, Version 1.0. (See accompanying
* file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
*/
#ifndef TWOBLUECUBES_CATCH_OPTION_HPP_INCLUDED
#define TWOBLUECUBES_CATCH_OPTION_HPP_INCLUDED
#include "catch_common.h"
namespace Catch {
// An optional type
template<typename T>
class Option {
public:
Option() : nullableValue( CATCH_NULL ) {}
Option( T const& _value )
: nullableValue( new( storage ) T( _value ) )
{}
Option( Option const& _other )
: nullableValue( _other ? new( storage ) T( *_other ) : CATCH_NULL )
{}
~Option() {
reset();
}
Option& operator= ( Option const& _other ) {
if( &_other != this ) {
reset();
if( _other )
nullableValue = new( storage ) T( *_other );
}
return *this;
}
Option& operator = ( T const& _value ) {
reset();
nullableValue = new( storage ) T( _value );
return *this;
}
void reset() {
if( nullableValue )
nullableValue->~T();
nullableValue = CATCH_NULL;
}
T& operator*() { return *nullableValue; }
T const& operator*() const { return *nullableValue; }
T* operator->() { return nullableValue; }
const T* operator->() const { return nullableValue; }
T valueOr( T const& defaultValue ) const {
return nullableValue ? *nullableValue : defaultValue;
}
bool some() const { return nullableValue != CATCH_NULL; }
bool none() const { return nullableValue == CATCH_NULL; }
bool operator !() const { return nullableValue == CATCH_NULL; }
operator SafeBool::type() const {
return SafeBool::makeSafe( some() );
}
private:
T* nullableValue;
char storage[sizeof(T)];
};
} // end namespace Catch
#endif // TWOBLUECUBES_CATCH_OPTION_HPP_INCLUDED
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