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Adaptable Generator


Category: functors 
Component type: concept 
Description
An Adaptable Generator is a Generator with a nested
typedef that defines its result type. [1] This nested typedef makes
it possible to use function object adaptors.
Refinement of
Generator
Associated types
Result type

F::result_type

The type returned when the Generator is called

Notation
F

A type that is a model of Adaptable Generator

Definitions
Valid expressions
None, except for those defined by Generator
Expression semantics
Complexity guarantees
Invariants
Models
The STL does not include any types that are models of Adaptable
Generator. An example of a userdefined Adaptable Generator is
as follows.
struct counter
{
typedef int result_type;
counter() : n(0) {}
result_type operator()() { return n++; }
result_type n;
};
Notes
[1]
Note the implication of this: a function pointer T (*f)()
is a Generator, but not an Adaptable Generator: the
expression f::result_type is nonsensical.
See also
Generator, Adaptable Unary Function, Adaptable Binary Function
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