custom Allocator compilation difficulties

I am trying to create a custom allocator, but there are compilation problems. By changing the value of the define from




I managed to switch from being unable to compile to being able to compile, but should it be like that? Shouldn't it be a little bit simpler ?

Does any body has experienc on that and already knows how these compilation problems may be solved.

The code the minimal required:

#include <bits/c++config.h>

#include <stdint.h>
#include <stddef.h>

#include <memory>
#include <string>
#include <limits>

typedef int32_t Token;
typedef unsigned char byte;

using namespace std;
template <typename T>
struct Allocator {
    static const size_t heapSize=0x1000;
    static size_t freePos;
    static Token freeT;
    static byte m[heapSize];


    typedef T value_type;

    typedef value_type* pointer;typedef const value_type* const_pointer;

    typedef value_type& reference;typedef const value_type& const_reference;

    typedef std::size_t size_type;
  typedef std::ptrdiff_t difference_type;

  template<typename U> struct rebind {typedef Allocator<U> other;};

    inline explicit Allocator() {freeT=0;freePos=0;}
  inline ~Allocator() {}
  inline Allocator(Allocator const&) {} // with explicit it doesn't compile

    //template<typename U>
  //inline explicit Allocator(Allocator<U> const&) {}

  inline pointer address(reference r) {return &r;}
  inline const_pointer address(const_reference r) {return &r;}

  static inline pointer allocate(size_type cnt, typename std::allocator<void>::const_pointer hint = 0){ 
        return reinterpret_cast<pointer>(::operator new(cnt * sizeof (T))); 
/*  pointer allocate(size_type n, const_pointer hint = 0 ){
        size_t t=freePos;freePos+=sizeof(T)*n;return t;

    static inline void deallocate(pointer p, size_type){
        ::operator delete(p);
/*  pointer deallocate(pointer p,size_type n){
        size_t sz=sizeof(T)*n;

  inline size_type max_size() const{ 
        return std::numeric_limits<size_type>::max() / sizeof(T);
  inline void construct(pointer p, const T& t) { new(p) T(t); }

  void              construct(pointer p, const T& val) 
                    { new ((T*) p) T(val); }
  inline void destroy(pointer p) { p->~T(); }
//   void              destroy(pointer p) { ((T*)m[p])->~T(); }

  inline bool operator==(Allocator const&) {return true;}
  inline bool operator!=(Allocator const& a) {return false;}


using namespace std;

typedef     std::basic_string< char,std::char_traits<char>,Allocator<char> > String;

int main(){
String s("Nice-the-data-goes-in-my-memory");
return 0;


It works fine if you make the comparison operators free functions. In general, relational operators should be free functions so they can convert implicitly on both sides:

template <typename T>
bool operator==(Allocator<T> const &, Allocator<T> const &) { return true; }

template <typename T>
bool operator!=(Allocator<T> const &, Allocator<T> const &) { return false; }

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