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Category: functors Component type: type


Not_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 not_equal_to<T> and x and y are objects of class T, then f(x,y) returns true if x != y and false otherwise.


Finds the first nonzero element in a list.
list<int> L;
list<int>::iterator first_nonzero = 
       find_if(L.begin(), L.end(), bind2nd(not_equal_to<int>(), 0));
assert(first_nonzero == L.end() || *first_nonzero != 0);


Defined in the standard header functional, and in the nonstandard backward-compatibility header function.h.

Template parameters

Parameter Description Default
T The type of not_equal_to's arguments.  

Model of

Adaptable Binary Predicate, DefaultConstructible

Type requirements

T is EqualityComparable.

Public base classes

binary_function<T, T, bool>.


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
not_equal_to() 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 not_equal_to's members are defined in the Adaptable Binary Predicate and DefaultConstructible requirements. Not_equal_to does not introduce any new members.


See also

The function object overview, Adaptable Binary Predicate, equal_to, greater, less, greater_equal, less_equal

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