Duplicate symbol error in C++ and Xcode -

i'm trying declare class acts enum. if include more once, several "duplicated symbol" errors.

this itemtype.h file

#ifndef darksnake_itemtype_h #define darksnake_itemtype_h  #define color_item_1 0xffff00ff #define color_item_2 0xffff03ff #define color_item_3 0xffff06ff  class itemtype { public:     static const itemtype none;     static const itemtype item_1;     static const itemtype item_2;     static const itemtype item_3;      static itemtype values[];      static itemtype getitemtypebycolor(const int color) {         (int = 0; 3; i++) {             if (color == values[i].getitemcolor()) {                 return values[i];             }         }         return none;     }       bool operator ==(const itemtype &item) const;     bool operator !=(const itemtype &item) const;       int getitemcolor() { return this->color; };  private:     const int color;     itemtype(const int _color) : color(_color) {} };  bool itemtype::operator == (const itemtype &item) const {     return this->color == item.color; }  bool itemtype::operator != (const itemtype &item) const {     return this->color != item.color; }  #endif 

and itemtype.cpp:

#include "itemtype.h"   const itemtype itemtype::none   = itemtype(0); const itemtype itemtype::item_1 = itemtype(color_item_1); const itemtype itemtype::item_2 = itemtype(color_item_2); const itemtype itemtype::item_3 = itemtype(color_item_3);  itemtype itemtype::values[] = {itemtype::item_1, itemtype::item_2, itemtype::item_3}; 

in first attempt tried put c++ code header file, , got same errors. don't know doing wrong.

can me, please?

many thanks!

you can't define non-inline functions outside class in header file.

to solve this, have 3 possibilities:

1. move definitions of operator== , operator!= inside class definition.
2. move definitions itemtype.cpp.
3. declare functions inline.