c++ - cannot declare pointer to ‘const class FOO&’ error -

i can't understand why compiler giving me these errors:

brain.cpp:16: error: cannot declare pointer ‘const class fact&’ brain.cpp: in constructor ‘fact::fact(const fact*)’: brain.cpp:20: error: cannot convert ‘fact**’ ‘fact*’ in assignment brain.cpp: in member function ‘void fact::addrelation(fact*)’: brain.cpp:29: error: expected type-specifier before ‘*’ token brain.cpp:29: error: cannot convert ‘int**’ ‘fact*’ in initialization brain.cpp:29: error: expected ‘,’ or ‘;’ before ‘fact’ brain.cpp:35: error: expected type-specifier before ‘*’ token brain.cpp:35: error: cannot convert ‘int**’ ‘fact*’ in assignment brain.cpp:35: error: expected ‘;’ before ‘fact’ brain.cpp: @ global scope: brain.cpp:47: error: expected unqualified-id before ‘=’ token brain.cpp:48: error: expected type-specifier before ‘*’ token brain.cpp:48: error: cannot convert ‘int**’ ‘fact*’ in initialization brain.cpp:48: error: expected ‘,’ or ‘;’ before ‘fact’ brain.cpp: in function ‘void addfact(fact*)’: brain.cpp:52: error: cannot convert ‘fact**’ ‘fact*’ in initialization brain.cpp:58: error: expected type-specifier before ‘*’ token brain.cpp:58: error: cannot convert ‘int**’ ‘fact*’ in assignment brain.cpp:58: error: expected ‘;’ before ‘fact’` 

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#include <iostream> using namespace std; class fact {     public:         fact(string f)         {             fact=f;             relations=null;             num_relations=0;         };         ~fact()         {             delete[] relations;         };         fact(const fact& *copy)         {             num_relations=copy->num_relations;             delete[] relations;             relations=new fact*[num_relations];             (int x=0; x<=num_relations; x++)             {                 relations[x]=copy->relations[x];             }             fact=copy->fact;         };         void addrelation(fact *fact)         {             fact *copy=new *fact[num_relations];             (int x=0; x<=num_relations; x++)             {                 copy[x]=relations[x];             }             delete[] relations;             relations=new *fact[num_relations+1];             (int x=0; x<=num_relations; x++)             {                 relations[x]=copy[x];             }             relations[num_relations+1]=fact;             num_relations++;         };         string fact;         fact *relations;         int num_relations; }; fact *facts=new *fact[0]; int num_facts=0; void addfact(fact *new_item) {     fact *copy=new fact*[num_facts];     (int x=0; x<=num_facts; x++)     {         copy[x]=facts[x];     }     delete[] facts;     facts=new *fact[num_facts+1];     (int x=0; x<=num_facts; x++)     {         facts[x]=copy[x];     }     delete[] copy;     num_facts++;     facts[num_facts]=new_item; } int main() {     fact *new_item=new fact("linux secure");     addfact(new_item);     delete[] facts;     return 0; } 

i'm using g++ 4.4.3 can't understand why doesn't consider "fact" data type

you can't declare pointer reference, try here:

fact(const fact& *copy) 

there no such thing pointers reference. wanted reference, without pointer:

fact(const fact& copy)