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A wrapper to allow moving of values into a C++ 11 lambda
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template<typename T> | |
class MoveCapture { | |
mutable T m_value; | |
public: | |
MoveCapture( ) = delete; | |
MoveCapture( T && val ) : m_value( std::move( val ) ) { } | |
MoveCapture( MoveCapture const & other ) : m_value( std::move( other.m_value ) ) { } | |
MoveCapture& operator=(MoveCapture const & rhs) { | |
if( this != &rhs ) { | |
m_value = std::move( rhs.m_value ); | |
} | |
return *this; | |
} | |
T& value( ) { | |
return m_value; | |
} | |
T const & value( ) const { | |
return m_value; | |
} | |
T& operator*() { | |
return m_value.operator*(); | |
} | |
T const & operator*() const { | |
return m_value.operator*(); | |
} | |
T const * operator->() const { | |
return m_value.operator->(); | |
} | |
~MoveCapture( ) = default; | |
T move_out( ) { | |
auto result = std::move( m_value ); | |
return result; | |
} | |
}; // class MoveCapture | |
template<typename T> | |
MoveCapture<T> as_move_only( T&& val ) { | |
return MoveCapture<T>( std::move( val ) ); | |
} | |
//////////////////////////////// | |
/// Example usage | |
int main( int, char** ) { | |
auto lots_of_data = std::vector<LargeObj>( 100000000 ); | |
auto mlots_of_data = as_move_only( std::move( lots_of_data ) ); | |
auto processed_data = [mlots_of_data](...) { | |
// do something | |
return mlots_of_data; | |
}( ); | |
return 0; | |
} |
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