Using a shared_ptr<const T> from a stored shared_ptr<T>

Question

I have some data stored using an std::shared_ptr<T> .

Now I want to use that that as const input to a function, so I need an std::shared_ptr<const T> . How do I do that?

Can I pass the std::shared_ptr<T> object to the function expecting a std::shared_ptr<const T> ?

Answer 1

Yes .

#include <memory>

void foo(std::shared_ptr<const int> ptr) {}

int main()
{
    auto ptr = std::make_shared<int>();
    foo(ptr);
}

Why didn't you just try it?