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replace_copy


Category: algorithms 
Component type: function 
Prototype
template <class InputIterator, class OutputIterator, class T>
OutputIterator replace_copy(InputIterator first, InputIterator last,
OutputIterator result, const T& old_value,
const T& new_value);
Description
Replace_copy copies elements from the range [first, last) to
the range [result, result + (lastfirst)), except that any element
equal to old_value is not copied; new_value is copied instead.
More precisely, for every integer n such that 0 <= n < lastfirst,
replace_copy performs the assignment *(result+n) = new_value
if *(first+n) == old_value, and *(result+n) = *(first+n)
otherwise.
Definition
Defined in the standard header algorithm, and in the nonstandard
backwardcompatibility header algo.h.
Requirements on 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 comparisons for
equality and exactly last  first assignments.
Example
vector<int> V1;
V1.push_back(1);
V1.push_back(2);
V1.push_back(3);
V1.push_back(1);
vector<int> V2(4);
replace_copy(V1.begin(), V1.end(), V2.begin(), 1, 99);
assert(V[0] == 99 && V[1] == 2 && V[2] == 3 && V[3] == 99);
Notes
See also
copy, replace, replace_if, replace_copy_if
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