Книга: Standard Template Library Programmer
Concepts
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Generator
Category: functors
Component type: concept
Description
A Generator is a kind of function object: an object that is called as if it were an ordinary C++ function. A Generator is called with no arguments.
Refinement of
Assignable
Associated types
| Result type | The type returned when the Generator is called |
Notation
F A type that is a model of Generator
Result The result type of F
f Object of type F
Definitions
The range of a Generator is the set of all possible value that it may return.
Valid expressions
| Name | Expression | Return type |
|---|---|---|
| Function call | f() |
Result |
Expression semantics
| Name | Expression | Semantics | Postcondition |
|---|---|---|---|
| Function call | f() |
Returns some value of type Result [1] | The return value is in f 's range. |
Models
• Result (*)()
Notes
[1] Two different invocations of f may return different results: a Generator may refer to local state, perform I/O, and so on. The expression f() is permitted to change f's state; f might, for example, represent a pseudo-random number generator.
See also
Function Object overview, Unary Function, Binary Function, Adaptable Generator
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