replace_copy_if


Category: algorithms 
Component type: function 
Prototype
template <class InputIterator, class OutputIterator, class Predicate, class T>
OutputIterator replace_copy_if(InputIterator first, InputIterator last,
OutputIterator result, Predicate pred,
const T& new_value)
Description
Replace_copy_if copies elements from the range [first, last) to
the range [result, result + (lastfirst)), except that any element
for which pred is true is not copied; new_value is copied instead.
More precisely, for every integer n such that 0 <= n < lastfirst,
replace_copy_if performs the assignment *(result+n) = new_value
if pred(*(first+n)), and *(result+n) = *(first+n)
otherwise.
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.

Predicate is a model of Predicate.

T is convertible to Predicate's argument type.

T is Assignable.

T is convertible to a type in OutputIterator's set of value types.
Preconditions

[first, last) is a valid range.

There is enough space in the output range to store the copied
values. That is, [result, result + (lastfirst)) is a valid range.

result is not an iterator within the range [first, last).
Complexity
Linear. Replace_copy performs exactly last  first
applications of pred and exactly last  first assignments.
Example
Copy elements from one vector to another, replacing all negative
numbers with 0.
vector<int> V1;
V1.push_back(1);
V1.push_back(1);
V1.push_back(5);
V1.push_back(2);
vector<int> V2(4);
replace_copy_if(V1.begin(), V1.end(), V2.begin(),
bind2nd(less<int>(), 0),
0);
assert(V[0] == 1 && V[1] == 0 && V[2] == 0 && V[3] == 2);
Notes
See also
copy, replace, replace_if, replace_copy
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