View Template Library

downcast<BaseType,DerivedType>


Category: functors	Component type: type

Description

downcast<BaseType,DerivedType> is a function object. Specifically, it is an Adaptable Unary Function, which means it is a function object that promotes a pointer to a reference. If f is a pointer to an object of class downcast<BaseType> and x is a pointer to an object of class BaseType, then f(x) returns dynamic_cast<DerivedType*>(x).

Example

Definition

Defined in functors.hpp.

Template parameters

Parameter	Description	Default
`BaseType`	The type of `downcast`'s arguments.
`DerivedType`	The type of the result

Model of

Adaptable Unary Function, DefaultConstructible

Type requirements

T has an operator*().

Public base classes

Unary_function<BaseType, DerivedType>.

Members

Member	Where defined	Description
`argument_type`	Adaptable Unary Function	The type of the first argument: `T`
`result_type`	Adaptable Unary Function	The type of the result: `bool`
`downcast()`	DefaultConstructible	The default constructor.
`DerivedType operator()(const BaseType& x)`	Unary Function	Function call operator. The return value is `dynamic_cast<Derived Type>(x)`.

New members

All of downcast's members are defined in the Adaptable Unary Function and DefaultConstructible requirements. downcast does not introduce any new members.