请问类模板生成的类如何访问类型参数的成员变量？

Question

template <class	 T>
class CRun
{
public:
	void run(){}
private: 
	T *t;
};

class Car
{
public:
	int m_a;
	int m_b;
};

CRun<Car> carRun;
carRun.xx？	//如何访问Car的成员变量m_a和m_b？

我定义了个模板CRun， 传入类名Car，声明了新的类对象carRun，请问怎样可以访问Car的成员变量？

Answer 1

#include <memory>

template <class T> class CRun {
public:
  CRun() : _target(new T) {}

  void run() {}

  T *target() { return _target.get(); }

private:
  std::unique_ptr<T> _target;
};

class Car {
public:
  int m_a;
  int m_b;
};

int main() {
  CRun<Car> carRun;
  carRun.target()->m_a = 1;
  carRun.target()->m_b = 2;
  return 0;
}