编辑代码

#include <iostream>
using namespace std;
#include <algorithm>
#include <vector>

class myPrint {
public:
	void operator()(int val) {
		cout << val << " ";
	}
};

class Greater30 {
public:
	bool operator()(int val) {
		return val >= 30;
	}

};

void test01() {
	vector<int> v;
	v.push_back(20);
	v.push_back(30);
	v.push_back(20);
	v.push_back(40);
	v.push_back(50);
	v.push_back(10);
	v.push_back(20);

	cout << "替换前：" << endl;
	for_each(v.begin(), v.end(), myPrint());
	cout << endl;

	//将容器中大于等于的30 替换成 3000
	cout << "替换后：" << endl;
	replace_if(v.begin(), v.end(), Greater30(), 3000);
	for_each(v.begin(), v.end(), myPrint());
	cout << endl;
}

int main() {

	test01();

	return 0;
}