#include <cassert>
#include <cstdlib>
#include <memory>
#include <new>

struct Free {
    void operator()(void* p) const noexcept { std::free(p); }
};
struct Record {
    int value;
    explicit Record(int n) noexcept : value(n) {}
    ~Record() noexcept {}
};

int main() {
    std::unique_ptr<void, Free> storage(std::malloc(sizeof(Record)));
    if (!storage) throw std::bad_alloc();
    Record* record = ::new (storage.get()) Record(42);
    assert(record->value == 42);
    record->~Record();
}