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In computer science, a metaobject is an object that manipulates, creates, describes, or implements other objects (including itself). The object that the metaobject is about is called the base object. Some information that a metaobject might store is the base object's type, interface, class, methods, attributes, parse tree, etc. Metaobjects are examples of the computer science concept of reflection, where a system has access (usually at run time) to its internal structure. Reflection enables a system to essentially rewrite itself on the fly, to change the actual structure of the system as it executes. == Metaobject protocol == A metaobject protocol (MOP) provides the vocabulary to access and manipulate the structure and behavior of objects. Typical functions of a metaobject protocol include: *Creating and deleting new classes *Creating new methods and properties *Changing the class structure so that classes inherit from different classes *Generating or modifying the code that defines the methods for the class The metaobject protocol is contrary to the "closed" aspect of Bertrand Meyer's open/closed principle. It reveals and allows a system to modify the internal structure of the objects. For this reason it is usually used sparingly and for special circumstances such as software that transforms other software, for example for reverse engineering. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「metaobject」の詳細全文を読む スポンサード リンク
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