make_shared
template <class T, class... Args> shared_ptr<T> make_shared (Args&&... args);
Allocates and constructs an object of type T passing args to its constructor, and returns an object of type shared_ptr<T> that owns and stores a pointer to it (with a use count of 1).
This function uses ::new to allocate storage for the object. A similar function, allocate_shared, accepts an allocator as argument and uses it to allocate the storage.
A shared_ptr object that owns and stores a pointer to a newly allocated object of type T.
int main()
{
A a;
a.val = 100;
using namespace std;
std::shared_ptr<A> p0 = make_shared<A>(a);
std::shared_ptr<A> p1 = make_shared<A>(a);
std::shared_ptr<A> p2 = p0;
std::shared_ptr<A> p3 = p1;
p2->val = 200;
printf("A.val :%d\n", a.val);
printf("A.val :%d\n", p0->val);
getchar();
}
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