Ошибка при использовании size_t

typedef std::size_t    size_type;

#include <iostream>
#include <cstring>
#include <cstddef>
class _Error {};
template <class T>
class Array {
    static const size_type minsize=10;
    size_type Count;
    size_type Size;
    value type* elems;
public:
    typedef T value_type;
    typedef T* iterator;
    typedef const T* const_iterator;
    typedef T& reference;
    typedef const T& const_reference;
    typedef std::size_t    size_type;
    //Constructors, destructor and copy methods
    Array(const size_type& n=minsize);
    Array(const Array& arr);
    Array(iterator, iterator);
    ~Array();
    //Implementations of iterators
    iterator begin() {return elems; }
    const_iterator begin() const {return elems; }
    iterator end() {return elems+Count; }
    const_iterator end() const {return elems +Count; }
    // Sizes
    size_type size() const;
    bool empty() const;
    size_type capacity() const;
    void resize(size_type) const;
    //Accessing of elements
    reference operator[](size_type);
    const_reference operator[](size_type) const;
    reference front() {return elems[0]; }
    const_reference front() const{return elems[0]; }
    reference back() {return elems[size()-1];}
    const_reference back()const {return elems[size()-1];}
    //Methods-modificators
    void push_back(const value_type& v);
    void pop_back();
    void Clear();
    void swap(Array& other);
    void assign(const value_type& v);
};
 
template<class T>
Array<T>::Array(iterator first, iterator last) 
{if (first< last) Size=last-first;{
elems = new value_type[size] 
for(int i=0; i<size; i++) 
    elems[i]=*(first++); 
Count=size; }
else throw _Error();
 
}

typedef std::size_t    size_type;