文件名称：C++ Plus Data Structures
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更新时间：2010-09-11 12:27:44
data structures
Historically, a course on data structures has been a mainstay of most computer
science departments. Over the last 18 years, however, the focus of this course
has broadened considerably. The topic of data structures has now been subsumed
under the broader topic of abstract data types (ADTs)—the study of classes of
objects whose logical behavior is defined by a set of values and a set of operations.
The term abstract data type describes a comprehensive collection of data values
and operations; the term data structures refers to the study of data and how to represent
data objects within a program; that is, the implementation of structured relationships.
The shift in emphasis is representative of the move towards more
abstraction in computer science education. We now are interested in the study of the
abstract properties of classes of data objects in addition to how the objects might be
represented in a program. Johannes J. Martin put it succinctly: “. . . depending on
the point of view, a data object is characterized by its type (for the user) or by its
structure (for the implementor).”