c++ 智能指针 shared_ptr

# include<stdio.h>
# include <stdlib.h>     //atoi
# include <string.h>    //strlen
# include <stdint.h>   //uint64_t
#include<iostream>
#include<memory>  //shared_ptr
using namespace std;

class A{    
public:
    template<class T> void sumA(T a ,T b,std::shared_ptr<int>* tensor);

    A(){
        printf("this is a construc function!\n");
    }
};
template<> void A::sumA<int>(int a,int b,shared_ptr<int>* tensor){
    printf("the sum of A is %d\n",a+b);
     *tensor = std::make_shared<int>(5);

}
int main(){
    A a;
    int b=10;
    shared_ptr<int>tensor;
    a.sumA<int>(1,2,&tensor);
    cout<<"share_ptr:"<<*tensor<<endl;
    return 0;
}

输出：

this is a construc function!
the sum of A is 3
share_ptr:00871244
请按任意键继续. . .