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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
- namespace Catch {
- // An optional type
- template<typename T>
- class Option {
- public:
- Option() : nullableValue( nullptr ) {}
- Option( T const& _value )
- : nullableValue( new( storage ) T( _value ) )
- {}
- Option( Option const& _other )
- : nullableValue( _other ? new( storage ) T( *_other ) : nullptr )
- {}
- ~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 = nullptr;
- }
- 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 != nullptr; }
- bool none() const { return nullableValue == nullptr; }
- bool operator !() const { return nullableValue == nullptr; }
- explicit operator bool() const {
- return some();
- }
- private:
- T *nullableValue;
- alignas(alignof(T)) char storage[sizeof(T)];
- };
- } // end namespace Catch
- #endif // TWOBLUECUBES_CATCH_OPTION_HPP_INCLUDED
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