mem_fun例子-創(chuàng)新互聯(lián)

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// functional_mem_fun.cpp
// compile with: /EHsc#include <vector>
#include<functional>
#include<algorithm>
#include<iostream>
#include<ext/functional>

using namespace std;

class StoreVals   
{
int val;
public:
    StoreVals() { val= 0; }
    StoreVals(int j) { val = j; }

bool display() { cout << val << " "; return true; }
int squareval() { val *= val; return val; }
int lessconst(int k) {val -= k; return val; }
};

int main( )
{
    vector<StoreVals *> v1;

    StoreVals sv1(5);
    v1.push_back(&sv1);
    StoreVals sv2(10);
    v1.push_back(&sv2);
    StoreVals sv3(15);
    v1.push_back(&sv3);
    StoreVals sv4(20);
    v1.push_back(&sv4);
    StoreVals sv5(25);
    v1.push_back(&sv5);

    cout<< "The original values stored are:" ;
    for_each(v1.begin(), v1.end(), mem_fun<bool, StoreVals>(&StoreVals::display));
    cout<< endl;

// Use of mem_fun calling member function through a pointer
// square each value in the vector using squareval ()    for_each(v1.begin(), v1.end(), mem_fun<int, StoreVals>(&StoreVals::squareval));   
    cout<< "The squared values are:" ;
    for_each(v1.begin(), v1.end(), mem_fun<bool, StoreVals>(&StoreVals::display));
    cout<< endl;

// Use of mem_fun1 calling member function through a pointer
// subtract 5 from each value in the vector using lessconst ()    for_each(v1.begin(), v1.end(), 
        bind2nd (__gnu_cxx::mem_fun1<int, StoreVals,int>(&StoreVals::lessconst), 5));   
    cout<< "The squared values less 5 are:" ;
    for_each(v1.begin(), v1.end(), mem_fun<bool, StoreVals>(&StoreVals::display));
    cout<< endl;
}

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mem_fun例子-創(chuàng)新互聯(lián)