48 lines
1.2 KiB
C++
48 lines
1.2 KiB
C++
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// 类模版类内部实现
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// 在类模版内部的成员函数中，可以使用泛型成员变量
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#include <iostream>
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#include <cstring>
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#include <cstdlib>
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#include <cmath> // sqrt
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using namespace std;
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template <typename T1, typename T2>
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class Point
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{
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private:
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T1 x;
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T2 y;
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public:
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Point(T1 x, T2 y) : x(x), y(y) {}
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public:
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// ? T1, T2 是哪一个对象的泛型的具体化？是当前调用的对象的泛型
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// 此函数要求两个对象的泛型必须一致
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float distance(Point<T1, T2> &other)
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{
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return sqrt((this->x - other.x) * (this->x - other.x) + (this->y - other.y) * (this->y - other.y));
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}
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};
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int main()
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{
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// 类的泛型必须指定类型
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Point<float, float> p1(2, 3);
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Point<float, float> p2(4, 5.5f);
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cout << "p1和p2的距离: " << p1.distance(p2) << endl;
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Point<int, int> p3(2, 3);
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Point<int, int> p4(4, 5.5f);
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cout << "p3和p4的距离: " << p3.distance(p4) << endl;
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// 只有同类型的对象才能调用成员函数
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// 调用成员函数时，泛型的具体化是当前调用的对象的泛型
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Point<int, float> p5(2, 3);
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Point<int, float> p6(4, 5.5f);
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cout << "p5和p6的距离: " << p5.distance(p6) << endl;
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return 0;
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}
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