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Type Categories
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Provides information on C++ type categories.

The four basic type categories (and their subcategories) are as follows:

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    Aggregate   Array
       struct
       union
       class (C++ only)
    Function
    Scalar
       Arithmetic
       Enumeration
       Pointer
       Reference (C++ only)
    void

Types can also be viewed in another way: they can be fundamental or derived types. The fundamental types are void, char, int, float, and double, together with short, long, signed, and unsigned variants of some of these. The derived types include pointers and references to other types, arrays of other types, function types, class types, structures, and unions.

A class object, for example, can hold a number of objects of different types together with functions for manipulating these objects, plus a mechanism to control access and inheritance from other classes.

Given any nonvoid type type (with some provisos), you can declare derived types as follows:

Declaring Types

Declaration | Description
type t; | An object of type type
type array[10]; | Ten types: array[0] - array[9]
type *ptr; | ptr is a pointer to type
type &ref = t; | ref is a reference to type (C++)
type func(void); | func returns value of type type
void func1(type t); | func1 takes a type type parameter
struct st {type t1;type t2}; | structure st holds two types

Note: type& var, type &var, and type & var are all equivalent.
See Also

Declaration Syntax

Tentative Definitions

Possible Declarations

External Declarations And Definitions

The Fundamental Types

Initialization

Declarations And Declarators

Variable Modifiers

Function Modifiers

The keyword void

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