CODEWITHSUNDEEP
c++c++17
Dmitriano
Dmitriano

Reputation: 2060

In-place new + reinterpret_cast

The code below compiles, but I am not 100% sure that it conforms to the standard:

#include <memory>

class A
{
public:
    
    int x;
};

int main()
{
    uint8_t m_storage[sizeof(A)];
    
    new (m_storage) A();
    
    auto deleter = [](A * p) { p->~A(); };
    std::unique_ptr<A, decltype(deleter)> p(reinterpret_cast<A *>(m_storage), deleter);
    
    p->x = 0;

    return p->x;
}

Is it a proper usage of reinterpret_cast?

Upvotes: 0

Views: 234

Answers (1)

Alex Guteniev
Alex Guteniev

Reputation: 13719

Yes it is correct reinterpret cast.

Albeit not correctly aligned storage. And potentially wrong placement new (should cast parameter to void*).

Upvotes: 1

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