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find_if


Category: algorithms	Component type: function

Prototype

template<class InputIterator, class Predicate>
InputIterator find_if(InputIterator first, InputIterator last,
                      Predicate pred);

Description

Returns the first iterator i in the range [first, last) such that pred(*i) is true. Returns last if no such iterator exists.

Definition

Defined in the standard header algorithm, and in the nonstandard backward-compatibility header algo.h.

Requirements on types

Predicate is a model of Predicate.
InputIterator is a model of InputIterator.
The value type of InputIterator is convertible to the argument type of Predicate.

Preconditions

[first, last) is a valid range.
For each iterator i in the range [first, last), *i is in the domain of Predicate.

Complexity

Linear: at most last - first applications of Pred.

Example

list<int> L;
L.push_back(-3);
L.push_back(0);
L.push_back(3);
L.push_back(-2);

list<int>::iterator result = find_if(L.begin(), L.end(),
                                     bind2nd(greater<int>(), 0));
assert(result == L.end() || *result > 0);