replace
Examines each element in a range and replaces it if it matches a specified value.
template<class ForwardIterator, class Type>
void replace(
ForwardIterator _First,
ForwardIterator _Last,
const Type& _OldVal,
const Type& _NewVal
);
Parameters
_First
A forward iterator pointing to the position of the first element in the range from which elements are being replaced._Last
A forward iterator pointing to the position one past the final element in the range from which elements are being replaced._OldVal
The old value of the elements being replaced._NewVal
The new value being assigned to the elements with the old value.
Remarks
The range referenced must be valid; all pointers must be dereferenceable and within the sequence the last position is reachable from the first by incrementation.
The order of the elements not replaced remains stable.
The operator== used to determine the equality between elements must impose an equivalence relation between its operands.
The complexity is linear; there are (_Last – _First) comparisons for equality and at most (_Last – _First) assignments of new values.
Example
// alg_replace.cpp
// compile with: /EHsc
#include <vector>
#include <algorithm>
#include <iostream>
int main( ) {
using namespace std;
vector <int> v1;
vector <int>::iterator Iter1;
int i;
for ( i = 0 ; i <= 9 ; i++ )
v1.push_back( i );
int ii;
for ( ii = 0 ; ii <= 3 ; ii++ )
v1.push_back( 7 );
random_shuffle (v1.begin( ), v1.end( ) );
cout << "The original vector v1 is:\n ( " ;
for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
cout << *Iter1 << " ";
cout << ")." << endl;
// Replace elements with a value of 7 with a value of 700
replace (v1.begin( ), v1.end( ), 7 , 700);
cout << "The vector v1 with a value 700 replacing that of 7 is:\n ( " ;
for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
cout << *Iter1 << " ";
cout << ")." << endl;
}
Sample Output
The original vector v1 is:
( 7 1 9 2 0 7 7 3 4 6 8 5 7 7 ).
The vector v1 with a value 700 replacing that of 7 is:
( 700 1 9 2 0 700 700 3 4 6 8 5 700 700 ).
Requirements
Header: <algorithm>
Namespace: std