Problem

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    • Problem

      Hi, I'm back :P.
      I'm programming a MUD game with the book "MUD game programming by Ron Penton" and i have had some issues that i can't get the solution.
      Here, This is the entityDataBase class(the code is in spanish :) but can be understand it)
      There are some problems like these:
      27 expected `)' before '&' token
      In member function `database& Tyrim::EntityBaseDatos<database>::iterator::operator*()':
      35 `itr' undeclared (first use this function)
      I can't understand it. I work with Dev C++, and the problem is in "typedef map<entityid, database> contenedor;"


      C Source Code

      1. #ifndef ENTITYBASEDATOS_H
      2. #define ENTITYBASEDATOS_H
      4. #include <string>
      5. #include <map>
      6. #include <vector>
      7. #include <fstream>
      8. #include <iterator>
      9. #include "Entity.h"
      11. using std::istream;
      12. using std::ostream;
      14. namespace Tyrim{
      16. template<class database>
      17. class EntityBaseDatos{
      19. public:
      21. typedef map<entityid, database> contenedor;
      22. //clase que hereda de iterator
      23. class iterator : public contenedor::iterator{
      25. public:
      26. iterator(){}//constructor por defecto
      27. iterator(contenedor::iterator& p_itr){ //constructor copia
      29. contenedor::iterator& itr = *this;
      30. itr = p_itr;
      31. }
      32. //desreferencia el iterador para devolver la referencia a la que apunta
      33. inline database& operator*(){
      35. contenedor::iterator& itr = *this;
      36. return itr->second;
      37. }
      38. inline database* operator->(){
      40. contenedor::iterator& itr = *this;
      41. return &(itr->second);
      42. }
      44. };//end class iterator
      46. inline static iterator begin(){
      48. return iterator(m_map.begin());
      49. }
      50. inline static iterator end(){
      52. return iterator(m_map.end());
      53. }
      54. inline static iterator find(entityid p_id){
      56. return iterator(m_map.find(p_id));
      57. }
      58. static iterator findfull(const string& p_str){
      60. return std::find_if(begin(),end(),BusquedaEntDeEntity(p_str));
      61. }
      62. static iterator find(const string& p_str){
      64. return double_find_if(begin(),end(),BusquedaEntDeEntity(p_str),BusquedaParcDeEntity(p_str));
      65. }
      66. inline static database& get(entityid p_id){
      68. iterator itr = find(p_id);
      69. if(itr == 0)
      70. throw std::exception();
      72. return *itr;
      73. }
      74. inline static bool has(entityid p_id){
      76. return (m_map.find(p_id) != m_map.end());
      77. }
      78. inline static bool hasfull(const string& p_str){
      80. return findfull(p_str) != end();
      81. }
      82. inline static bool has(const string& p_str){
      84. return find(p_str) != end();
      85. }
      86. inline static int size(){return (int)m_map.size();}
      87. static entityid EncontrarDisponibleID(){
      89. if(m_map.size() == 0)
      90. return 1;
      92. if(m_map.size() == m_map.rend()->first)
      93. return m_map.size() + 1;
      95. entityid dispid = 0;
      96. entityid previo = 0;
      98. map<entityid,database>::iterator itr = m_map.begin();
      100. while(!dispid){
      102. if(itr->firts != previo + 1)
      103. dispid = previo + 1;
      104. else
      105. previo = itr->first;
      106. itr++;
      107. }
      109. return dispid;
      110. }
      112. protected:
      113. static map<entityid, database> m_map;
      115. }; //end class EntityBaseDatos
      117. //class o typename lo mismo es
      118. template<typename database>
      119. class EntityBaseDatosVector{
      121. typedef std::vector<database>::iterator iterator;
      123. public:
      125. inline static iterator begin(){return m_vector.begin() + 1;}
      126. inline static iterator end(){return m_vector.end();}
      127. inline static size_t size(){return m_vector.size() - 1;}
      129. inline static database& get(entityid p_id){
      131. if(p_id >= m_vector.size() || p_id == 0)
      132. throw std::exception();
      133. return m_vector[p_id];
      134. }
      135. protected:
      136. static std::vector<database> m_vector;
      137. };
      139. }//end Tyrim
      141. #endif
      Display All


      //class Entity

      C Source Code

      1. #ifndef ENTITY_H
      2. #define ENTITY_H
      4. #include <string>
      5. #include "Librerias/BasicLib.h"
      7. using namespace std;
      8. namespace Tyrim{
      10. typedef unsigned int entityid;
      12. class Entity{
      14. public:
      15. //constructor
      16. inline Entity(){
      17. m_id = 0;
      18. m_name = "UNDEFINED";
      19. }
      20. inline string& Nombre(){return m_name;}
      21. inline entityid& id(){return m_id;}
      22. inline string NomMin(){
      23. return BasicLib::LowerCase(m_name);
      24. }
      25. inline bool BuscarEnt(const string& p_str){
      26. return NomMin() == BasicLib::LowerCase(p_str);
      27. }
      28. inline bool BuscarParcial(const string& p_str){
      30. if(p_str.size() == 0)
      31. return true;
      32. string nombre = NomMin();
      33. string busqueda = BasicLib::LowerCase(p_str);
      35. size_t pos = nombre.find(busqueda);
      37. while(pos != string::npos){
      39. if(pos == 0 || m_name[pos -1] == ' '){
      40. return true;
      42. }
      44. pos = nombre.find(busqueda, pos +1);
      45. }
      47. return false;
      48. }
      49. protected:
      50. entityid m_id;
      51. string m_name;
      52. };
      54. struct BusquedaEntDeEntity{
      56. BusquedaEntDeEntity(const string& p_str)
      57. :m_name(p_str){/*No hace nada*/};
      59. bool operator()(Entity& p_entity){
      61. return p_entity.BuscarEnt(m_name);
      62. }
      63. bool operator()(Entity* p_entity){
      65. return p_entity != 0 && p_entity->BuscarEnt(m_name);
      66. }
      68. string m_name;
      69. }; //end clase Entity
      71. struct BusquedaParcDeEntity{
      73. BusquedaParcDeEntity(const string& p_str)
      74. :m_name(p_str){/*No hace nade*/}
      76. bool operator()(Entity& p_entity){
      78. return p_entity.BuscarParcial(m_name);
      79. }
      80. bool operator()(Entity* p_entity){
      82. return p_entity != 0 && p_entity->BuscarParcial(m_name);
      83. }
      84. string m_name;
      85. };
      87. } //end namespace Tyrim
      88. #endif
      Display All


      Thanks.
      Be a pointer my friend

    • Inheriting from an iterator or any STL data structure is a huge no-no. You should never do this; these objects are not meant to be used as base classes. Try to use an composition model rather than an inheritance model. I would clean that up and try again.

      -Rez