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| 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 user-defined 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, AdaptableUnaryFunction, AdaptableBinaryFunction
