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The memento pattern is a software design pattern that exposes the private internal state of an object. One example of how this can be used is to restore an object to its previous state (undo via rollback), another is versioning, another is custom serialization.
With memento pattern the internal state of an object is stored. The object in which the state is saved, is called memento and is organized through the memento originator. This returns a memento, initialized with information of the current state, when undo is executed, so that the state can be checked. The memento is only visible for the originator.
Design Patterns: Elements of Reusable Object-Oriented Software (1994) is a software engineering book describing software design patterns. The book was written by Erich Gamma , Richard Helm , Ralph Johnson , and John Vlissides , with a foreword by Grady Booch .
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A (software) design pattern is a general solution to a common problem in software design. It is a description or template for how to solve a problem, that can be used in different situations. A design pattern typically shows relationship and interaction between classes or objects, without specifying final application classes or objects that are ...
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In software engineering, a software design pattern or design pattern is a general, reusable solution to a commonly occurring problem in many contexts in software design. [1] A design pattern is not a rigid structure that can be transplanted directly into source code. Rather, it is a description or a template for solving a particular type of ...
The appeal of the design of these pieces lies within the sleek lines and minimalist features from the 1950s and 60s. Original pieces, especially by renowned designers like Eames or Hans Wegner ...