Книга: Standard Template Library Programmer
less
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less<T>
Category: functors
Component type: type
Description
Less<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<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 negative element in a list.
list<int> L;
…
list<int>::iterator first_negative = find_if(L.begin(), L.end(), bind2nd(less<int>(), 0));
assert(first_negative == L.end() || *first_negative < 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'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() |
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's members are defined in the Adaptable Binary Predicate and DefaultConstructible requirements. less does not introduce any new members.
See also
The function object overview, Strict Weak Ordering, Adaptable Binary Predicate, LessThan Comparable, equal_to, not_equal_to, greater, greater_equal, less_equal
Оглавление книги
- Lesson Summary
- Configuring Wireless Networks
- Advanced Wireless Networking
- Support for Wireless Networking in Fedora
- Wireless
- Lesson 2: Implementing System Applications
- unless
- Securing a Wireless Network
- Paging Through Output with less
- 5.2.6. Lessons Learned
- 5.5.2 Endless-Loop Tasks
- Lesson 3: Implementing Threads and Thread Synchronization