[C++]Member functions are instantiated only when they

For class templates, member functions are instantiated only when they are used. This, of course, saves time and space.

using namespace std;template <typename T>class myTemplate{private:    typename T m_t;public:    myTemplate(T t):m_t(t){};    T AddOne(){        return m_t + 1;    }    void Output(){cout<<m_t<<endl;}};int main(){    myTemplate<int> i(10);    i.AddOne();    i.Output();    myTemplate<string> s("temp");    //s.AddOne(); // Compile error becasue std::string has no operator + with int type    s.Output(); // however, this line has no issue    return 10;}

原文链接: https://www.cnblogs.com/aoaoblogs/archive/2011/07/04/2097261.html

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