Types of Expressions
C++ expressions are divided into several categories:
Primary expressions
. These are the building blocks from which all other expressions are formed.
Postfix expressions
. These are primary expressions followed by an operator — for example, the array subscript or postfix increment operator.
Expressions formed with unary operators
. Unary operators act on only one operand in an expression.
Expressions formed with binary operators
. Binary operators act on two operands in an expression.
Expressions with the conditional operator
. The conditional operator is a ternary operator — the only such operator in the C++ language — and takes three operands.
Constant expressions
. Constant expressions are formed entirely of constant data.
Expressions with explicit type conversions
. Explicit type conversions, or “casts,” can be used in expressions.
Expressions with pointer-to-member operators
.
Casting
. Type-safe “casts” can be used in expressions.
Run-Time Type Information
. Determine the type of an object during program execution.