Книга: Standard Template Library Programmer
Unary Function
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Unary Function
Category: functors
Component type: concept
Description
A Unary Function is a kind of function object: an object that is called as if it were an ordinary C++ function. A Unary Function is called with a single argument.
Refinement of
Assignable
Associated types
| Argument type | The type of the Unary Function's argument. |
| Result type | The type returned when the Unary Function is called |
Notation
F A type that is a model of Unary Function
X The argument type of F
Result The result type of F
f Object of type F
x Object of type X
Definitions
The domain of a Unary Function is the set of all permissible values for its argument.
The range of a Unary Function is the set of all possible values that it may return.
Valid expressions
| Name | Expression | Return type |
|---|---|---|
| Function call | f(x) |
Result |
Expression semantics
| Name | Expression | Precondition | Semantics | Postcondition |
|---|---|---|---|---|
| Function call | f(x) |
x is in f's domain | Calls f with x as an argument, and returns a value of type Result [1] | The return value is in f's range |
Models
• Result (*)(X)
Notes
[1] Two different invocations of f may return different results, even if f is called with the same arguments both times. A Unary Function may refer to local state, perform I/O, and so on. The expression f(x) is permitted to change f's state.
See also
Function Object overview, Generator, Binary Function Adaptable Unary Function
Оглавление книги
- Adaptable Unary Function
- pointer_to_unary_function
- Hash Function
- EXTERNAL FUNCTION DIRECTORY
- CHAPTER 4 Functions and Libraries in mikroC
- Functions
- Basic Functions
- Using Functions in Shell Scripts
- 4.1 mikroC Functions
- 4.2 mikroC Built-in Functions
- 4.3 mikroC Library Functions
- 4.1.1 Function Prototypes