《STL源码剖析》简单空间配置器的例子为什么编译不能通过？

//file in jjalloc.h
#ifndef _JJALLOC_
#define _JJALLOC_

#include<new> //for placement new
#include<cstddef> //for ptrdiff_t, size_t
#include<cstdlib> //for exit()
#include<climits> //for UINT_MAX
#include<iostream> //for cerr

namespace JJ
{
template <class T>
inline T* _allocate(ptrdiff_t size, T*){
set_new_handler(0);
T* tmp = (T*) (::operator new ((size_t)(size*sizeof(T))));
if(tmp == 0){
cerr << "Out of memory"<<endl;
exit(1);
}
return tmp;
}
template <class T>
inline void _deallocate(T* buffer){
::operator delete(buffer);
}
template <class T1,class T2>
inline void _construct(T1 *p, const T2& value){
new(p) T1(value);
}
template <class T>
inline void _destroy(T* ptr){
ptr->~T();
}
template <class T>
class allocator{
public:
typedef T value_type;
typedef T* pointer;
typedef const T* const_pointer;
typedef T& reference;
typedef const T& const_reference;
typedef size_t size_type;
typedef ptrdiff_t difference_type;

template <class U>
struct rebind{
typedef allocator<U> other;
};
pointer allocator(size_type n, const void* hint=0){
return _allocate((difference_type)n,(pointer)0);
}
void deallocate(pointer p,size_type n){
_deallocate(p);
}
void construct(pointer p,const T& value){
_construct(p,value);
}
void destroy(pointer p){
_destroy(p);
}
pointer address(reference x){
return (pointer)&x;
}
const_pointer const_address(const_reference x){
return (const_pointer)&x;
}
size_type max_size() const{
return size_type(UINT_MAX/sizeof(T));
}
};
} //end of namespace JJ
#endif
//file in jjalloc.cpp
#include "jjalloc.h"
#include<vector>
#include<iostream>
#if !defined (STLPORT) || defined(__STL_USE_NAMESPACES)
using namespace std;
#endif
int main(){
int ia[5] = {0,1,2,3,4};
unsigned int i;
vector<int,JJ:allocate<int> > iv(ia,ia+5);
for(i=0;i<iv.size();i++)
cout << iv[i] <<' ';
cout << endl;
}
提示编译的错误是
Compiling...
jjalloc.cpp
c:\stl\allocator\jjalloc.h(49) : error C2533: 'allocator<T>' : constructors not allowed a return type
c:\stl\allocator\jjalloc.h(70) : see reference to class template instantiation 'JJ::allocator<T>' being compiled
c:\stl\allocator\jjalloc.h(49) : error C2533: 'allocator<T>::allocator<T>' : constructors not allowed a return type
c:\stl\allocator\jjalloc.h(70) : see reference to class template instantiation 'JJ::allocator<T>' being compiled
c:\stl\allocator\jjalloc.h(52) : error C2061: syntax error : identifier 'poniter'
c:\stl\allocator\jjalloc.h(70) : see reference to class template instantiation 'JJ::allocator<T>' being compiled
c:\stl\allocator\jjalloc.cpp(10) : error C2882: 'JJ' : illegal use of namespace identifier in expression
c:\stl\allocator\jjalloc.cpp(10) : error C2143: syntax error : missing ',' before ':'
c:\stl\allocator\jjalloc.cpp(10) : error C2143: syntax error : missing ',' before ')'
c:\stl\allocator\jjalloc.cpp(11) : error C2143: syntax error : missing ')' before ';'
c:\stl\allocator\jjalloc.cpp(11) : error C2059: syntax error : ')'
c:\stl\allocator\jjalloc.cpp(14) : error C2143: syntax error : missing ';' before '}'
c:\stl\allocator\jjalloc.cpp(15) : error C2143: syntax error : missing ';' before '}'
c:\stl\allocator\jjalloc.cpp(15) : fatal error C1001: INTERNAL COMPILER ERROR
(compiler file 'Y?, line 1)
Please choose the Technical Support command on the Visual C++
Help menu, or open the Technical Support help file for more information
Error executing cl.exe.

jjalloc.exe - 11 error(s), 0 warning(s)
请教各位大侠，小弟初学先谢了！