mirror of https://github.com/procxx/kepka.git
74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
/*
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* Created by Phil on 02/12/2012.
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* Copyright 2012 Two Blue Cubes Ltd. All rights reserved.
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*
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* Distributed under the Boost Software License, Version 1.0. (See accompanying
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* file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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*/
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#ifndef TWOBLUECUBES_CATCH_OPTION_HPP_INCLUDED
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#define TWOBLUECUBES_CATCH_OPTION_HPP_INCLUDED
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namespace Catch {
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// An optional type
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template<typename T>
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class Option {
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public:
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Option() : nullableValue( nullptr ) {}
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Option( T const& _value )
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: nullableValue( new( storage ) T( _value ) )
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{}
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Option( Option const& _other )
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: nullableValue( _other ? new( storage ) T( *_other ) : nullptr )
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{}
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~Option() {
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reset();
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}
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Option& operator= ( Option const& _other ) {
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if( &_other != this ) {
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reset();
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if( _other )
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nullableValue = new( storage ) T( *_other );
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}
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return *this;
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}
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Option& operator = ( T const& _value ) {
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reset();
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nullableValue = new( storage ) T( _value );
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return *this;
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}
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void reset() {
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if( nullableValue )
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nullableValue->~T();
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nullableValue = nullptr;
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}
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T& operator*() { return *nullableValue; }
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T const& operator*() const { return *nullableValue; }
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T* operator->() { return nullableValue; }
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const T* operator->() const { return nullableValue; }
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T valueOr( T const& defaultValue ) const {
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return nullableValue ? *nullableValue : defaultValue;
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}
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bool some() const { return nullableValue != nullptr; }
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bool none() const { return nullableValue == nullptr; }
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bool operator !() const { return nullableValue == nullptr; }
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explicit operator bool() const {
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return some();
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}
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private:
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T *nullableValue;
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alignas(alignof(T)) char storage[sizeof(T)];
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};
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} // end namespace Catch
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#endif // TWOBLUECUBES_CATCH_OPTION_HPP_INCLUDED
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