40 lines
1.0 KiB
C++
40 lines
1.0 KiB
C++
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// mem_fn 有两个重载版本：
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// 用法1：mem_fn(&MyClass::printMessage) 用于将成员函数转换为函数对象
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// 用法2：mem_fn(&MyClass::printMessage)(&obj, "hello world") 用于调用成员函数
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// mem_fn 是一个函数模板，它接受一个成员函数指针或成员函数引用，并返回一个函数对象，该对象可以调用相应的成员函数。
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#include <iostream>
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#include <vector>
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#include <algorithm>
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using namespace std;
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class Stu
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{
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private:
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string name;
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int age;
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public:
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Stu(const string &name, int age) : name(name), age(age) {}
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public:
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void show()
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{
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cout << "name is " << name << ", age is " << age << endl;
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}
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};
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int main()
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{
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vector<Stu> vs;
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vs.push_back(Stu("disen", 18));
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vs.push_back(Stu("lucy", 20));
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vs.push_back(Stu("jack", 15));
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vs.push_back(Stu("mack", 19));
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// 遍历容器中所有成员，成员函数作为仿函数时，则通过容器成员调用它的仿函数
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for_each(vs.begin(), vs.end(), mem_fun_ref(&Stu::show));
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return 0;
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}
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