Why we should be careful when deciding to use the factory function std::make_shared

smart_pointers.cpp

#include <iostream>
#include <memory>
#include <list>

struct Heavy
{
    char buffer[1024 * 1024 * 8];
};

std::list<std::weak_ptr<Heavy>> container;

int main()
{
    std::cout << "start memory allocation using std::shared_ptr<T>(...)" << std::endl;

    for (int i=0; i<1024; i++)
    {
        container.push_back(std::shared_ptr<Heavy>(new Heavy()));
    }

    std::cout << "process completed without any problem" << std::endl;

    std::cout << "start memory allocation using std::make_shared<T>(new T(...))" << std::endl;

    for (int i=0; i<1024; i++)
    {
        container.push_back(std::make_shared<Heavy>());
    }

    std::cout << "process completed... after probably freezing for long time!" << std::endl;
}