disposable(3)

QuantLib::Disposable – generic disposable object with move semantics

Synopsis

#include <ql/utilities/disposable.hpp>

Inherits T.

Public Member Functions

Disposable (T &t)

Disposable (const Disposable< T > &t)

Disposable< T > & operator= (const Disposable< T > &t)

Detailed Description

template<class T> class QuantLib::Disposable< T >

generic disposable object with move semantics

This class can be used for returning a value by copy. It relies on the returned object exposing a swap(T&) method through which the copy constructor and assignment operator are implemented, thus resulting in actual move semantics. Typical use of this class is along the following lines:

 Disposable<Foo> bar(Integer i) {
 Foo f(i*2);
 return f;
 }

Warning

In order to avoid copies in code such as shown above, the conversion from T to Disposable<T> is destructive, i.e., it does not preserve the state of the original object. Therefore, it is necessary for the developer to avoid code such as

 Disposable<Foo> bar(Foo& f) {
 return f;
 }

 which would likely render the passed object unusable. The correct way to obtain the desired behavior would be: 

 Disposable<Foo> bar(Foo& f) {
 Foo temp = f;
 return temp;
 }

Author

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