#include <boost/container/vector.hpp>
#include <boost/type_traits/is_pod.hpp>
#include <boost/utility/enable_if.hpp>

struct noinit_t {};
noinit_t const noinit = {};

#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
struct listinit_t {};
listinit_t const listinit {};
#endif // !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)

template < class T >
struct MyAllocator : std::allocator<T>
{
    using std::allocator<T>::construct;

    // for v.emplace_back(noinit);
    void construct( T* c, noinit_t )
    {
        ::new (static_cast<void*>(c)) T; // note: T; instead of T();
    }

#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
    // for v.emplace_back( listinit, ... );
    template<typename... Args>
    void construct(T* c, listinit_t, Args&&... args)
    { ::new (static_cast<void*>(c)) T{ std::forward<Args>(args)... }; }
#endif // !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)

    template < class U >
    struct rebind
    {
        typedef MyAllocator<U> other;
    };
};

int main()
{
#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
    namespace cont = std;
#else
    namespace cont = boost::container;
#endif

    cont::vector< cont::vector<int>, MyAllocator< cont::vector<int> > > vm;
    vm.emplace_back(2);
    assert( 2 == vm.back().size() );

#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
    vm.emplace_back( listinit, 2, 2, 2 );
    vm.emplace_back( listinit, 2 );
    assert( 1 == vm.back().size() );
#endif // !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)

    cont::vector< int, MyAllocator<int> > vi;
    vi.emplace_back(5);
    vi.pop_back();
    vi.emplace_back(noinit);
    assert( 0 != vi.back() );
}