example_13_12.cpp

data+structures+using+c的源码

//STL Functions remove, remove_if, remove_copy, and
//remove_copy_if

#include <iostream>
#include <cctype>
#include <algorithm>
#include <iterator>
#include <vector>

using namespace std;

bool lessThanEqualTo50(int num);
int main()
{
    char cList[10] = {'A', 'a', 'A', 'B', 'A', 
                      'c', 'D', 'e', 'F', 'A'};        //Line 1

    vector<char> charList(cList, cList + 10);          //Line 2
   vector<char>::iterator lastElem, newLastElem;       //Line 3

    ostream_iterator<char> screen(cout, " ");          //Line 4

    cout<<"Line 6: Character list: ";                  //Line 5
    copy(charList.begin(), charList.end(), screen);    //Line 6
    cout<<endl;                                        //Line 7

       //remove 
    lastElem = remove(charList.begin(), 
                      charList.end(), 'A');            //Line 8

    cout<<"Line 9: Character list after removing A: "; //Line 9
    copy(charList.begin(), lastElem, screen);          //Line 10
    cout<<endl;                                        //Line 11

      //remove_if
    newLastElem = remove_if(charList.begin(), 
                           lastElem, isupper);         //Line 12
    cout<<"Line 13: Character list after removing "
        <<"the uppercase letters: "<<endl;             //Line 13
    copy(charList.begin(), newLastElem, screen);       //Line 14
    cout<<endl<<endl;                                  //Line 15
	
    int list[10] = {12, 34, 56, 21, 34, 
                   78, 34, 55, 12, 25};                //Line 16

    vector<int> intList(list, list + 10);              //Line 17
    vector<int>::iterator  endElement;                 //Line 18

    ostream_iterator<int> screenOut(cout, " ");        //Line 19

    cout<<"Line 20: intList: ";                        //Line 20
    copy(intList.begin(), intList.end(), screenOut);   //Line 21
    cout<<endl;                                        //Line 22

    vector<int> temp1(10);                             //Line 23

        //remove_copy
    endElement = remove_copy(intList.begin(), intList.end(), 
                             temp1.begin(), 34);       //Line 24
 
    cout<<"Line 25: temp1 after copying all the "
        <<"elements of intList except 34: "<<endl;     //Line 25
    copy(temp1.begin(), endElement, screenOut);        //Line 26
    cout<<endl;                                        //Line 27

    vector<int> temp2(10, 0);                          //Line 28

        //remove_copy_if
    remove_copy_if(intList.begin(), intList.end(), 
                 temp2.begin(), lessThanEqualTo50);    //Line 29

    cout<<"Line 30: temp2 after copying all the elements of "
        <<"intList except \nnumbers less than 50: ";   //Line 30
    copy(temp2.begin(), temp2.end(), screenOut);       //Line 31
    cout<<endl;                                        //Line 32

    return 0;
}

bool lessThanEqualTo50(int num)
{
     return (num <= 50);
}