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make_shared
source link: https://www.cplusplus.com/reference/memory/make_shared/
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function template
std::make_shared
template <class T, class... Args> shared_ptr<T> make_shared (Args&&... args);
Make shared_ptr
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.
Parameters
args List of elements passed to T's constructor.Args is a list of zero or more types.
Return Value
A shared_ptr object that owns and stores a pointer to a newly allocated object of type T.Example
// make_shared example
#include <iostream>
#include <memory>
int main () {
std::shared_ptr<int> foo = std::make_shared<int> (10);
// same as:
std::shared_ptr<int> foo2 (new int(10));
auto bar = std::make_shared<int> (20);
auto baz = std::make_shared<std::pair<int,int>> (30,40);
std::cout << "*foo: " << *foo << '\n';
std::cout << "*bar: " << *bar << '\n';
std::cout << "*baz: " << baz->first << ' ' << baz->second << '\n';
return 0;
}*foo: 10 *bar: 20 *baz: 30 40
See also
allocate_sharedAllocate shared_ptr (function template )shared_ptr::shared_ptrConstruct shared_ptr (public member function )shared_ptr::operator=shared_ptr assignment (public member function )Recommend
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