std::replace_copy, std::replace_copy_if

Defined in header <algorithm>
template< class InputIterator, class OutputIterator, class T > OutputIterator replace_copy( InputIterator first,                              InputIterator last,                              OutputIterator d_first,                              const T& old_value,                              const T& new_value );	(1)
template< class InputIterator, class OutputIterator, class UnaryPredicate, class T > OutputIterator replace_copy_if( InputIterator first,                                 InputIterator last,                                 OutputIterator d_first,                                 UnaryPredicate p,                                 const T& new_value );	(2)

Copies the all elements from the range [first, last) to another range beginning at d_first replacing all elements satisfying specific criteria with new_value. The first version replaces the elements that are equal to old_value, the second version replaces elements for which predicate p returns true. The source and destination ranges cannot overlap.

Parameters

first, last	-	the range of elements to copy
d_first	-	the beginning of the destination range
old_value	-	the value of elements to replace
p	-	unary predicate which returns ​true if the element value should be replaced. The signature of the predicate function should be equivalent to the following: bool pred(const Type &a); The signature does not need to have const &, but the function must not modify the objects passed to it. The type Type must be such that an object of type ForwardIterator can be dereferenced and then implicitly converted to Type. ​
new_value	-	the value to use as replacement

Return value

iterator to the element past the last element copied.

Complexity

Exactly last - first applications of the predicate.

Example

The following copy prints a vector, replacing all values over 5 with 99 on the fly.

run this code

#include <algorithm>
#include <vector>
#include <iostream>
#include <iterator>
#include <functional>
 
int main()
{
    std::vector<int> v{5, 7, 4, 2, 8, 6, 1, 9, 0, 3};
    std::replace_copy_if(v.begin(), v.end(),
                         std::ostream_iterator<int>(std::cout, " "),
                         [](int n){return n > 5;}, 99);
    std::cout << '\n';
}

Output:

5 99 4 2 99 99 1 99 0 3

See also

remove remove_if	removes elements satisfying specific criteria (function template)