Книга: Standard Template Library Programmer
Binary Predicate
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Binary Predicate
Category: functors
Component type: concept
Description
A Binary Predicate is a Binary Function whose result represents the truth or falsehood of some condition. A Binary Predicate might, for example, be a function that takes two arguments and tests whether they are equal.
Refinement of
Binary Function
Associated types
| Result type | The type returned when the Binary Predicate is called. The result type must be convertible to bool. |
Notation
F A type that is a model of Binary Predicate
X The first argument type of F
Y The second argument type of F
f Object of type F
x Object of type X
y Object of type Y
Valid expressions
| Name | Expression | Return type |
|---|---|---|
| Function call | f(x,y) |
Convertible to bool |
Expression semantics
| Name | Expression | Precondition | Semantics | Postcondition |
|---|---|---|---|---|
| Function call | f(x,y) |
The ordered pair (x,y) is in the domain of f. | Returns true if the condition is satisfied, false if it is not. | The result is either true or false. |
Models
• bool (*)(int,int)
• equal_to
See also
Predicate, Adaptable Predicate, Adaptable Binary Predicate
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