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8_4_5_mem-fun-test.cpp
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54 lines (45 loc) · 1001 Bytes
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// file: mem-fun-test.cpp
#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>
using namespace std;
class Shape {
public:
virtual void display() = 0;
};
class Rect : public Shape {
public:
virtual void display() {
cout << "Rect: ";
}
};
class Circle : public Shape {
public:
virtual void display() {
cout << "Circle: ";
}
};
class Square : public Shape {
public:
virtual void display() {
cout << "Square: ";
}
};
int main() {
// STL容器只支持value semantic，不支持reference semantics
// vector<Shape&> V; 无法通过编译
vector<Shape *> V;
V.push_back(new Rect);
V.push_back(new Circle);
V.push_back(new Square);
V.push_back(new Circle);
V.push_back(new Rect);
// polymorphically
for (int i = 0; i < V.size(); ++i)
V[i]->display();
cout << endl;
// polymorphically
for_each(V.begin(), V.end(), mem_fun(&Shape::display));
cout << endl;
}