Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
Export (0) Print
Expand All

Postfix Expressions

Postfix expressions consist of primary expressions or expressions in which postfix operators follow a primary expression. The postfix operators are listed in the following table.

Postfix Operators

The following syntax describes possible postfix expressions:

primary-expression 
postfix-expression [ expression ]
postfix-expression ( expression-list<SUB>opt</SUB> )
simple-type-name ( expression-list<SUB>opt</SUB> )
postfix-expression . name
postfix-expression –> name
postfix-expression ++
postfix-expression ––
cast-keyword < typename > (expression )
typeid ( typename )

The postfix-expression above may be a primary expression or another postfix expression. See primary expressions. Postfix expressions group left to right, thus allowing the expressions to be chained together as follows:

func(1)->GetValue()++

In the above expression, func is a primary expression, func(1) is a function postfix expression, func(1)->GetData is a postfix expression specifying a member of the class, func(1)->GetData() is another function postfix expression, and the entire expression is a postfix expression incrementing the return value of GetData. The meaning of the expression as a whole is "call func passing 1 as an argument and get a pointer to a class as a return value. Then call GetValue() on that class, then increment the value returned.

The expressions listed above are assignment expressions, meaning that the result of these expressions must be an r-value.

The postfix expression form

simple-type-name ( expression-list )

indicates the invocation of the constructor. If the simple-type-name is a fundamental type, the expression list must be a single expression, and this expression indicates a cast of the expression's value to the fundamental type. This type of cast expression mimics a constructor. Because this form allows fundamental types and classes to be constructed using the same syntax, this form is especially useful when defining template classes.

The cast-keyword is one of dynamic_cast, static_cast or reinterpret_cast. More information may be found in dynamic_cast, static_cast and reinterpet_cast.

The typeid operator is considered a postfix expression. See typeid operator.

Community Additions

ADD
Show:
© 2015 Microsoft