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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.
A class or struct definition is like a blueprint that specifies what the type can do. An object is basically a block of memory that has been allocated and configured according to the blueprint. A program may create many objects of the same class.nstances of classes are created by using the new operator. In the following example, Person is the type and person1 and person 2 are instances, or objects, of that type. C#. Copy. Because structs are value types, a variable of a struct object holds a copy of the entire object.