Copy elements from vector to another vector, removing elements greater than 9 (remove_copy_if)
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
bool greater9( int );
int main()
{
const int SIZE = 10;
int a[ SIZE ] = { 10, 2, 10, 4, 16, 6, 14, 8, 12, 10 };
// Remove 10 from v
vector< int > v( a, a + SIZE );
vector< int >::iterator newLastElement;
newLastElement = remove( v.begin(), v.end(), 10 );
// Copy elements from v4 to c, removing elements greater than 9
vector< int > v4( a, a + SIZE );
vector< int > c2( SIZE, 0 );
remove_copy_if( v4.begin(), v4.end(), c2.begin(), greater9 );
cout << endl;
return 0;
}
bool greater9( int x )
{
return x > 9;
}Remove all odd numbers from the vector using remove_if
#include <algorithm>
#include <vector>
#include <list>
#include <iostream>
using namespace std;
template <typename elementType>
bool IsOdd (const elementType& number){
return ((number % 2) == 1);
}
int main (){
list <int> l;
for (int nCount = 0; nCount < 10; ++ nCount)
l.push_back (nCount);
list <int>::const_iterator li;
for ( li = l.begin (); li != l.end (); ++ li )
cout << *li << " ";
vector <int> v (l.size () * 2);
vector <int>::iterator iLastPos;
iLastPos = copy ( l.begin (), l.end (), v.begin () );
vector <int>::iterator i;
i = remove_if (v.begin (), v.end (), IsOdd <int>); // The predicate
v.erase (i , v.end ());
vector <int>::iterator vi;
for ( vi = v.begin (); vi != v.end (); ++ vi )
cout << *vi << " ";
return 0;
}removeif, bind2nd() and list
#include <iostream>
#include <list>
#include <functional>
#include <algorithm>
using namespace std;
int main()
{
list<int> list1;
list<int>::iterator p, endp;
int i;
for(i=1; i < 20; i++) list1.push_back(i);
p = list1.begin();
while(p != list1.end()) {
cout << *p << endl;
p++;
}
endp = remove_if(list1.begin(), list1.end(),bind2nd(greater<int>(), 4));
p = list1.begin();
while(p != endp) {
cout << *p << endl;
p++;
}
return 0;
}remove_if for list
/* The following code example is taken from the book
* "The C++ Standard Library - A Tutorial and Reference"
* by Nicolai M. Josuttis, Addison-Wesley, 1999
*
* (C) Copyright Nicolai M. Josuttis 1999.
* Permission to copy, use, modify, sell and distribute this software
* is granted provided this copyright notice appears in all copies.
* This software is provided "as is" without express or implied
* warranty, and with no claim as to its suitability for any purpose.
*/
#include <iostream>
#include <list>
#include <algorithm>
using namespace std;
/* PRINT_ELEMENTS()
* - prints optional C-string optcstr followed by
* - all elements of the collection coll
* - separated by spaces
*/
template <class T>
inline void PRINT_ELEMENTS (const T& coll, const char* optcstr="")
{
typename T::const_iterator pos;
std::cout << optcstr;
for (pos=coll.begin(); pos!=coll.end(); ++pos) {
std::cout << *pos << " ";
}
std::cout << std::endl;
}
class Nth { // function object that returns true for the nth call
private:
int nth; // call for which to return true
int count; // call counter
public:
Nth (int n) : nth(n), count(0) {
}
bool operator() (int) {
return ++count == nth;
}
};
int main()
{
list<int> coll;
// insert elements from 1 to 9
for (int i=1; i<=9; ++i) {
coll.push_back(i);
}
PRINT_ELEMENTS(coll,"coll: ");
// remove third element
list<int>::iterator pos;
pos = remove_if(coll.begin(),coll.end(), // range
Nth(3)); // remove criterion
coll.erase(pos,coll.end());
PRINT_ELEMENTS(coll,"nth removed: ");
}coll: 1 2 3 4 5 6 7 8 9
nth removed: 1 2 4 5 7 8 9
Remove value from vector with condition with remove_if()
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
bool greater9( int );
int main()
{
const int SIZE = 10;
int a[ SIZE ] = { 10, 2, 10, 4, 16, 6, 14, 8, 12, 10 };
// Remove 10 from v
vector< int > v( a, a + SIZE );
vector< int >::iterator newLastElement;
newLastElement = remove( v.begin(), v.end(), 10 );
// Remove elements greater than 9 from v3
vector< int > v3( a, a + SIZE );
newLastElement = remove_if( v3.begin(), v3.end(), greater9 );
return 0;
}
bool greater9( int x )
{
return x > 9;
}Use predicate in std::remove_if
#include <iostream>
using std::cout;
using std::endl;
#include <algorithm>
#include <vector>
#include <iterator>
bool greater9( int );
int main()
{
int a[ 10 ] = { 10, 2, 10, 4, 16, 6, 14, 8, 12, 10 };
std::ostream_iterator< int > output( cout, " " );
std::vector< int > v3( a, a + 10 ); // copy of a
cout << "Vector v3 before removing all elements"
<< "\ngreater than 9:\n ";
std::copy( v3.begin(), v3.end(), output );
// remove elements greater than 9 from v3
std::vector< int >::iterator newLastElement = std::remove_if( v3.begin(), v3.end(), greater9 );
cout << "\nVector v3 after removing all elements"
<< "\ngreater than 9:\n ";
std::copy( v3.begin(), newLastElement, output );
return 0;
}
bool greater9( int x )
{
return x > 9;
}Vector v3 before removing all elements
greater than 9:
10 2 10 4 16 6 14 8 12 10
Vector v3 after removing all elements
greater than 9:
2 4 6 8
Use remove_if() to remove all elements from list that are greater than 10.
#include <iostream>
#include <list>
#include <functional>
#include <algorithm>
using namespace std;
int main()
{
list<int> list1;
list<int>::iterator res_itr;
for(unsigned i=1; i < 20; ++i) list1.push_back(i);
res_itr = remove_if(list1.begin(), list1.end(),bind2nd(greater<int>(), 10));
return 0;
}
