remove_copy_if


Category: algorithms 
Component type: function 
Prototype
template <class InputIterator, class OutputIterator, class Predicate>
OutputIterator remove_copy_if(InputIterator first, InputIterator last,
OutputIterator result, Predicate pred);
Description
Remove_copy_if copies elements from the range [first, last) to a
range beginning at result, except that elements for which pred
is true are not copied. The return
value is the end of the resulting range. This operation is stable,
meaning that the relative order of the elements that are copied is the same
as in the range [first, last).
Definition
Defined in the standard header algorithm, and in the nonstandard
backwardcompatibility header algo.h.
Requirements on types

InputIterator is a model of Input Iterator.

OutputIterator is a model of Output Iterator.

InputIterator's value type is convertible to a type in
OutputIterator's set of value types.

Predicate is a model of Predicate.

InputIterator's value type is convertible to Predicate's argument
type.
Preconditions

[first, last) is a valid range.

There is enough space in the output range to store the copied
values. That is, if there are n elements in [first, last)
that do not satisfy pred, then [result, result+n) is
a valid range.

result is not an iterator in the range [first, last).
Complexity
Linear. Exactly last  first applications of pred, and at most
last  first assignments.
Example
Fill a vector with the nonnegative elements of another vector.
vector<int> V1;
V.push_back(2);
V.push_back(0);
V.push_back(1);
V.push_back(0);
V.push_back(1);
V.push_back(2);
vector<int> V2;
remove_copy_if(V1.begin(), V1.end(),
back_inserter(V2),
bind2nd(less<int>(), 0));
Notes
See also
copy, remove, remove_if, remove_copy,
unique, unique_copy.
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