Concept PrimitiveTransform

PrimitiveTransform

Description

A PrimitiveTransform is class type that has a nested class template called impl that takes three template parameters representing an expression type, a state type and a data type. Specializations of the nested impl template are ternary monomorphic function objects that accept expression, state, and data parameters. The PrimitiveTransform is itself a PolymorphicFunctionObject that is implemented in terms of the nested impl template.

Associated types

result_type
```
typename Fn::template impl<Expr, State, Data>::result_type
```
The return type of the overloaded function call operator.

Notation

Fn: A type playing the role of primitive-transform-type in the PrimitiveTransform concept.
Expr: A type playing the role of expression-type in the PrimitiveTransform concept.
State: A type playing the role of state-type in the PrimitiveTransform concept.
Data: A type playing the role of data-type in the PrimitiveTransform concept.
fn: Object of type Fn
expr: Object of type Expr
state: Object of type State
data: Object of type Data

Valid expressions

Name	Expression	Type	Semantics
Polymorphic Function Call 1	fn(expr)	result_type	Applies the transform.
Polymorphic Function Call 2	fn(expr, state)	result_type	Applies the transform.
Polymorphic Function Call 3	fn(expr, state, data)	result_type	Applies the transform.
Monomorphic Function Call	typename Fn::template impl< Expr, State, Data >()(expr, state, data)	result_type	Applies the transform.

Models

boost::proto::_child_c< 0 >