example_13_6.cpp

data+structures+using+c的源码

//STL Predicates

#include <iostream>
#include <string>
#include <algorithm>
#include <iterator>
#include <vector>
#include <functional>

using namespace std;

int main()
{
    equal_to<int> compare;                           //Line 1
    bool isEqual = compare(6,6);                     //Line 2

    cout<<"Line 3: isEqual = "<<isEqual<<endl;       //Line 3

    greater<string> greaterStr;                      //Line 4

    string str1 = "Hello";                           //Line 5
    string str2 = "There";                           //Line 6

    if(greaterStr(str1,str2))                        //Line 7
       cout<<"Line 8: \""<<str1<<"\" is greater "
           <<"than \""<<str2<<"\""<<endl;            //Line 8
    else                                             //Line 9
       cout<<"Line 10: \""<<str1<<"\" is not "
           <<"greater than \""<<str2<<"\""<<endl;    //Line 10

    int temp[8] = {2, 3, 4, 5, 1, 7, 8, 9};          //Line 11

    vector<int> vecList(temp, temp+8);               //Line 12
    vector<int>::iterator intItr1, intItr2;          //Line 13
    ostream_iterator<int> screen(cout, " ");         //Line 14

    cout<<"Line 15: vecList: ";                      //Line 15
    copy(vecList.begin(), vecList.end(), screen);    //Line 16
    cout<<endl;                                      //Line 17

    intItr1 = adjacent_find(vecList.begin(), 
                            vecList.end(),
                            greater<int>());         //Line 18
    intItr2 = intItr1 + 1;                           //Line 19

    cout<<"Line 20: In vecList, the first set of "
        <<"out of order elements are: "<<*intItr1
        <<" "<<*intItr2<<endl;                       //Line 20
    cout<<"Line 21: In vecList, the first out of "
        <<"order element is at position: "
        <<vecList.end() - intItr2<<endl;             //Line 21

    return 0;
}