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equal_to<T>


Category: functors 
Component type: type 
Description
Equal_to<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
equal_to<T> and x and y are objects of class T, then
f(x,y) returns true if x == y and false otherwise.
Example
Rearrange a vector such that all of the elements that are equal to
zero precede all nonzero elements.
vector<int> V;
...
partition(V.begin(), V.end(), bind2nd(equal_to<int>(), 0));
Definition
Defined in the standard header functional, and in the nonstandard
backwardcompatibility header function.h.
Template parameters
Parameter

Description

Default

T

The type of equal_to's arguments.


Model of
Adaptable Binary Predicate, DefaultConstructible
Type requirements
T is EqualityComparable.
Public base classes
binary_function<T, T, bool>.
Members
New members
All of equal_to's members are defined in the
Adaptable Binary Predicate and DefaultConstructible
requirements.
Equal_to does not introduce any new members.
Notes
See also
The function object overview,
Adaptable Binary Predicate,
not_equal_to,
greater,
less,
greater_equal,
less_equal
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1999 Silicon Graphics, Inc. All Rights Reserved.
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