C / C++ / MFC

///Elements requiring explicit initialization
/// \note Elements don't have a default Ctor.
class Element
{
public:
    /// init an element
    Element(ParamType _a)
    { ... }
private:
    //your implementation
};

static const size_t BUFSZ = ...;

/// a class aggragating \c BUFSZ elements
class Aggregate
{
public:
    /// initialize with _a
    Aggregate(ParamType _a) :vector()
    { 
        vector = reinterpret_cast<Element*>(buffer);
        for(size_t i=0; i<BUFSZ; ++i)
            new(vector+i)Element(_a); //< USE PLACEMENT NEW
    }
    /// do proper element copy (not just bulk memory copy)
    Aggregate(const Aggregate& _s)
    {
        vector = reinterpret_cast<Element*>(buffer);
        for(size_t i=0; i<BUFSZ; ++i)
            new(vector+i)Element(_s.vector[i]); //< USE PLACEMENT NEW to construct copies
    }
    /// do proper element destruction
    ~Aggregate()
    {
        for(size_t i=0; i<BUFSZ; ++i)
            vector[i].~Element(); //< DO EXPLICIT DESTRUCTION
    }
private:
    char buffer[BUFSZ*sizeof(Element)];
    Element* vector;    
};

2 bugs found.
> recompile ...
65534 bugs found.