重载操作符的问题 - 编程论坛

#2

Jonny02012018-10-30 21:58

myvector operator * (double n)   //重载*操作符（矢量*数）
    {
       myvector result = *this;
        for (int i = 0; i < dim; i++)
            result.element[i] = element[i] * n;
        return result;
    }

#3

复旦2018-10-30 23:06

那数*矢量操作符怎么写呢

#4

rjsp2018-10-31 10:04

friend Vector operator*( double value, const Vector& rhs )

#5

复旦2018-10-31 13:00

这个操作符函数不能在类里面写功能吧。
外面怎么写具体代码呢？

#6

Jonny02012018-11-01 19:01

程序代码：

#include <iostream>

using namespace std;
class int_number {
    friend ostream &operator<<(ostream &, const int_number &) noexcept;
    private:
        int num;
    public:
        int_number(int num = 0) : num {num} {}
        int_number(const int_number &) = default;
        int_number(int_number &&) noexcept = default;
        ~int_number() = default;
        int_number operator*(int rhs) const noexcept {
            auto temp {*this};
            temp.num *= rhs;
            return temp;
        }
};
int_number operator*(int lhs, const int_number &rhs) noexcept {
    return rhs * lhs;
}
ostream &operator<<(ostream &os, const int_number &rhs) noexcept {
    os << rhs.num;
    return os;
}
int main(int argc, char *argv[]) {
    int_number number = 10;
    cout << number * 10 << endl;
    cout << 8 * number << endl;
}