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C++ Programming/Structures - Structures. 1  A structure is a compound data type that contains different members of different types. The members are accessed by their names. 2  A struct is defined by... 3  The optional keywords public:, protected:, private: declare the protection status of the following members.
The two constructs are identical in C++ except that in structs the default accessibility is public, whereas in classes the default is private.opy. Classes and structs are the constructs whereby you define your own types. Classes and structs can both contain data members and member functions, which enable you to describe the type's state and behavior.