如何使用c ++ 11的类型推断功能来避免重复类型信息来创建shared_ptr实例？

#include<iostream>
#include<memory>

class MyClass {
public:
    MyClass(int x) : x_(x) {}
    void Print() const { std::cout << "MyClass: " << x_ << std::endl; }
private:
    int x_;
};

int main() {
    auto ptr = std::make_shared<MyClass>(42);
    ptr->Print();
    return 0;
}

#include<iostream>
#include<memory>

class MyClass {
public:
    MyClass(int x) : x_(x) {}
    void Print() const { std::cout << "MyClass: " << x_ << std::endl; }
private:
    int x_;
};

int main() {
    auto ptr = std::shared_ptr<MyClass>(new MyClass(42));
    ptr->Print();
    return 0;
}