C++ STL algorithm, remove_copy_if() program example
Compiler: Visual C++ Express Edition 2005
Compiled on Platform: Windows XP Pro SP2
Header file: Standard
Additional project setting: Set project to be compiled as C++
Project -> your_project_name Properties -> Configuration Properties -> C/C++ -> Advanced -> Compiled As: Compiled as C++ Code (/TP)
Other info: none
To do: Using the C++ remove_copy_if() to copy elements from a source range to a destination range, except that satisfying a predicate are not copied, without disturbing the order of the remaining elements and returning the end of a new destination range in C++ programming
To show: How to use the C++ algorithm, remove_copy_if() to copy elements from a source range to a destination range, except that satisfying a predicate are not copied, without disturbing the order of the remaining elements and returning the end of a new destination range in C++ programming
// C++ STL algorithm, remove_copy_if()
#include <vector>
#include <algorithm>
#include <iostream>
using namespace std;
bool greathan(int value)
{return value >7;}
int main(void)
{
// vector container
vector <int> vec1, vec2(14);
// vector iterator
vector <int>::iterator Iter1, Iter2, new_end;
int i, j;
// push data in range
for(i = 0; i <= 10; i++)
vec1.push_back(i);
for(j = 0; j <= 2; j++)
vec1.push_back(5);
// print the data
cout<<"The original vec1 vector data: ";
for(Iter1 = vec1.begin(); Iter1 != vec1.end(); Iter1++)
cout<<*Iter1<<" ";
cout<<endl;
// randomly shuffle the data
random_shuffle(vec1.begin(), vec1.end());
cout<<"\nThe original vec1 vector data randomly shuffled: ";
for(Iter1 = vec1.begin(); Iter1 != vec1.end(); Iter1++)
cout<<*Iter1<<" ";
cout<<endl;
// remove elements with a value greater than 7
new_end = remove_copy_if(vec1.begin(), vec1.end(), vec2.begin(), greathan);
cout<<"\nAfter the remove_copy_if() operation, the vec1 vector is left unchanged as: ";
for(Iter1 = vec1.begin(); Iter1 != vec1.end(); Iter1++)
cout<<*Iter1<<" ";
cout<<endl;
cout<<"\nvec2 vector is a copy of vec1 vector with values greater than 7 removed: ";
for(Iter2 = vec2.begin(); Iter2 != new_end; Iter2++)
cout<<*Iter2<<" ";
cout<<endl;
return 0;
}
Output examples:
The original vec1 vector data: 0 1 2 3 4 5 6 7 8 9 10 5 5 5
The original vec1 vector data randomly shuffled: 5 1 9 2 0 5 7 3 4 6 8 5 10 5
After the remove_copy_if() operation, the vec1 vector is left unchanged as: 5 1 9 2 0 5 7 3 4 6 8 5 10 5
vec2 vector is a copy of vec1 vector with values greater than 7 removed: 5 1 2 0 5 7 3 4 6 5 5
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