面向对象程序设计复习贴

Ray

+-*/%^&|~
const T operatorX(const T& l, const T& r);
！&& || < <= >= >
bool operatorX(const T& l, const T& r);
[]
E& T: perator [] (int index);

Ray

Number operator++(int n){ Number tmp=*this; ++(*this); return tmp;}


Number& ++operator(){this->value+=1; return *this;}

Ray

#include <iostream>
using namespace std;


void print(int x) { cout << "Normal int: " << x << endl; }


template <typename T>
void print(T x) { cout << "Template: " << x << endl; }


int main() {
    print(10);      // (1)
    print(10.5);    // (2)
    print<int>(20); // (3)
    return 0;
}


Normal int: 10
Template: 10.5
Template: 20

Ray

template <typename T>
class Pair {
private:
    T first;
    T second;
public:
    Pair(T a, T b);
    T getMax() const;
};


template <class T>
Pair<T>:air(T a, T b):first(a),second(b){}


template <class T>
T Pair<T>::getMax()const{return (first>second) ? first : second;}

Ray

class Guard {
public:
    ~Guard() { cout << "~Guard "; }
};


void inner() { throw 404; }


void outer() {
    Guard g;
    try {
        inner();
    } catch (int e) {
        cout << "Catch in outer ";
        throw;
    }
}


int main() {
    try {
        outer();
    } catch (int e) {
        cout << "Catch in main ";
    }
}


outer()先创建了g，此后inner()产生了error，导致g被析构，输出第一行：
~Guard
随后outer()内部发生了catch，输出第二行：
Catch in outer
随后继续throw 404到外面，main()内部发生了catch，输出第三行：
Catch in main