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1 Several ways to initialize std::shared_ptr

Here I will only summarize the several methods of std::shared_ptr initialization, and do not explain the advantages and disadvantages of std::shared_ptr. There are many ways to initialize, and I often get confused and memorable when typing.

1.1 Constructor initialization

std::shared_ptr<int> pointer(new int(1));

std::shared_ptr<int> pointer1 = pointer;

std::shared_ptr<std::string> ss(new std::string("AAA"));

std::shared_ptr<std::string> = std::shared_ptr<std::string>(new std::string("AAA"));

1.2 std::make_shared initialization (recommended method)

std::shared_ptr<string> p3 = std::make_shared<string>();

std::shared_ptr<string> p2 = std::make_shared<string>("hello");

//Instead of std::shared_ptr, p5 points to a dynamically allocated empty vector<string>
auto p5 = make_shared<vector<string>>();

1.3 reset initialization

std::shared_ptr<int> pointer = nullptr;
pointer.reset(new int(1));

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