单个类模板语法
#include <iostream>
using namespace std;
template <typename T>
class A
{
public:
A(T a = 0)
{
this->a = a;
}
void printA()
{
cout << "a: " << a << endl;
}
T a;
};
//类模板做函数参数
void useA(A<int> &a)
{
a.printA();
}
int main()
{
A<int> a1(10),a2(20);
useA(a1);
useA(a2);
system("pause");
return 0;
}
继承中的模板类派生普通类:
#include <iostream>
using namespace std;
template <typename T>
class A
{
public:
A(T a = 0)
{
this->a = a;
}
void printA()
{
cout << "a: " << a << endl;
}
T a;
};
//从模板类派生时,需要具体化模板类,C++编译器需要知道父类的数据类型具体是什么样子的
//==>要知道父类所占的内存大小是多少,只有数据类型固定下来,才知道如何分配内存
class B : public A<int>
{
public:
B(int a = 10,int b = 20):A<int> (a)
{
this->b = b;
}
void printB()
{
cout << "a:" << a << " b:" << b << endl;
}
private:
int b;
};
int main()
{
B b1(5, 6);
b1.printB();
system("pause");
return 0;
}
从模板类派生模板类
#include <iostream>
using namespace std;
template <typename T>
class A
{
public:
A(T a = 0)
{
this->a = a;
}
void printA()
{
cout << "a: " << a << endl;
}
T a;
};
template <typename T>
class B : public A<T>
{
public:
B(T a = 10, T b = 20) :A<T>(a)
{
this->b = b;
}
void printB()
{
cout << "a:" << A<int>::a << " b:" << b << endl;
}
private:
T b;
};
int main()
{
B<int> b1(5, 6);
b1.printB();
system("pause");
return 0;
}