std::replace_copy, std::replace_copy_if

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Defined in header <algorithm>

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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 );

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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 );

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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 expression p(v) must be convertible to bool for every argument v of type (possibly const) VT, where VT is the value type of ForwardIterator, regardless of value category, and must not modify v. Thus, a parameter type of VT&is not allowed, nor is VT unless for VT a move is equivalent to a copy(since C++11). ​
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

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