C++ 速查手冊 V1.00 - 單元 10 範例

u1001.cpp

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#include <iostream>   template <typename T1, typename T2> T1 do_something (const T1& a, const T2& b) {     return a + b; }   int main() {     std::cout << do_something(1, 10)               << std::endl;     std::cout << do_something(1, 10.5)               << std::endl;     std::cout << do_something(2.5, 6.32)               << std::endl;       return 0; }   /* Kaiching Chang    u1001.cpp    2014-02 */

u1002.cpp

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#include <iostream>   template <typename T> class Demo { public:    Demo(const T& a, const T& b) {       this->a = a;       this->b = b;    }      T do_something() {       return a + b;    }       private:    T a;    T b; };   int main() {    Demo<int> d1(20, 25);    std::cout << d1.do_something()              << std::endl;    Demo<double> d2(5.2, 3.95);    std::cout << d2.do_something()              << std::endl;    Demo<char> d3('1', '2');    std::cout << d3.do_something()              << std::endl;      return 0; }   /* Kaiching Chang    u1002.cpp    2014-02 */

u1003.cpp

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#include <iostream>   template <typename T> class Demo { public:    Demo(const T& a, const T& b) {       this->a = a;       this->b = b;    }      T do_something() {       return a + b;    }       private:    T a;    T b; };   template <typename T> using D = Demo<T>;   int main() {    D<int> d1(20, 25);    std::cout << d1.do_something()              << std::endl;    D<double> d2(5.2, 3.95);    std::cout << d2.do_something()              << std::endl;    D<char> d3('1', '2');    std::cout << d3.do_something()              << std::endl;      return 0; }     /* Kaiching Chang    u1003.cpp    2014-02 */

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