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C++ classes
A class in C++ is a user defined type or data structure declared with keyword ''class'' that has data and functions (also called methods) as its members whose access is governed by the three access specifiers ''private'', ''protected'' or ''public'' (by default access to members of a class is ''private''). A class (declared with keyword ''class'') in C++ differs from a structure (declared with keyword ''struct'') as by default, members are ''private'' in a class while they are ''public'' in a structure. The private members are not accessible outside the class; they can be accessed only through methods of the class. The public members form an interface to the class and are accessible outside the class. Instances of these data types are known as objects and can contain member variables, constants, member functions, and overloaded operators defined by the programmer.
==Differences between struct and classes in C++==
In C++, a ''structure'' is a class defined with the struct keyword.〔ISO/IEC (2003). ''ISO/IEC 14882:2003(E): Programming Languages - C++ §9 Classes ()'' para. 4〕 Its members and base classes are public by default. A class defined with the class keyword has private members and base classes by default. This is the only difference between structs and classes in C++.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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