創(chuàng)新互聯(lián)專注于企業(yè)營銷型網(wǎng)站、網(wǎng)站重做改版、淮北網(wǎng)站定制設(shè)計、自適應(yīng)品牌網(wǎng)站建設(shè)、html5、商城網(wǎng)站定制開發(fā)、集團公司官網(wǎng)建設(shè)、成都外貿(mào)網(wǎng)站建設(shè)公司、高端網(wǎng)站制作、響應(yīng)式網(wǎng)頁設(shè)計等建站業(yè)務(wù),價格優(yōu)惠性價比高,為淮北等各大城市提供網(wǎng)站開發(fā)制作服務(wù)。>// 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;
}
分享名稱:mem_fun例子-創(chuàng)新互聯(lián)
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