test.cpp

#include <new>

template<class T>
class MyArray
{
public:
    MyArray(int _Count) : ObjSize(sizeof(T)), Count(_Count)
    {
        Buf = new char[ObjSize * Count];
        for (int i = 0; i < Count; ++i)
            new(Buf + ObjSize * i) T;
    }

    T &operator[](int Pos) { return *reinterpret_cast<T *>(Buf + ObjSize * Pos); }

private:
    char *Buf;
    int ObjSize;
    int Count;
};

class Foo { int bar = 42; };

int main(int argc, char *argv[])
{
    MyArray<Foo> arr(10);
    return 0;
}