Книга: Standard Template Library Programmer
less_equal
Разделы на этой странице:
less_equal<T>
Category: functors
Component type: type
Description
Less_equal<T> is a function object. Specifically, it is an Adaptable Binary Predicate, which means it is a function object that tests the truth or falsehood of some condition. If f is an object of class less_equal<T> and x and y are objects of class T, then f(x,y) returns true if x <= y and false otherwise.
Example
Finds the first non-positive element in a list.
list<int> L;
…
list<int>::iterator first_nonpositive = find_if(L.begin(), L.end(), bind2nd(less_equal<int>(), 0));
assert(first_nonpositive == L.end() || *first_nonpositive <= 0);
Definition
Defined in the standard header functional, and in the nonstandard backward-compatibility header function.h.
Template parameters
| Parameter | Description |
|---|---|
T |
The type of less_equal's arguments. |
Model of
Adaptable Binary Predicate, DefaultConstructible
Type requirements
T is LessThan Comparable.
Public base classes
binary_function<T, T, bool>.
Members
| Member | Where defined | Description |
|---|---|---|
first_argument_type |
Adaptable Binary Predicate | The type of the first argument: T |
second_argument_type |
Adaptable Binary Predicate | The type of the second argument: T |
result_type |
Adaptable Binary Predicate | The type of the result: bool |
less_equal() |
DefaultConstructible | The default constructor. |
bool operator()(const T& x, const T& y) |
Binary Function | Function call operator. The return value is x <= y. |
New members
All of less_equal's members are defined in the Adaptable Binary Predicate and DefaultConstructible requirements. Less_equal does not introduce any new members.
See also
The function object overview, Adaptable Binary Predicate, equal_to, not_equal_to, greater, less, greater_equal
Оглавление книги
