list::insert(iterator position, size_type n, const & x); failed to compile

[philuu12]

Hi,

I got the following compile errors when I used STL
list::insert ( iterator position, size_type n, const T& x );

==================

#include <iostream>
#include <list>
 
main()
{
   list<int> myList;
   list<int>::iterator it;
 
   myList.push_back(0);
   it = myList.begin();
 
   myList.insert(it, 2);  // 2 0
   myList.insert(it,2,20);  // <--- Compile errors  
}
 

==================
%g++ simpleList.cc
*************************
/software/gnu/gcc/2.8.1/sun4os5.10/include/g++/stl_list.h: In method `void list<int,__default_alloc_template<false,0> >::insert(struct __list_iterator<int,int &,int *>, int, int)':
/software/gnu/gcc/2.8.1/sun4os5.10/include/g++/stl_list.h:387: invalid type argument of `unary *'
*************************

Why does this fail to compile? Any help would be appreciated.

thanks,

PL

[Banfa]

Once I fixed the main return type to int and added std:: to the fron of the declarations on lines 6 and 7 this compiles fine for me.

[philuu12]

I tried your suggestions, but still failed:

============

#include <iostream>
#include <list>
 
using namespace std;
 
int main()
{
   std::list<int> myList;
   std::list<int>::iterator it;
 
   myList.push_back(0);
   it = myList.begin();
 
   myList.insert(it, 2);  // 2 0
   myList.insert(it,2,20);  // <--- Compile errors
   return 0;
 
}
 

**********************
g++ listQuestion.cc
/software/gnu/gcc/2.8.1/sun4os5.10/include/g++/stl_list.h: In method `void list<int,__default_alloc_template<false,0> >::insert(struct __list_iterator<int,int &,int *>, int, int)':
/software/gnu/gcc/2.8.1/sun4os5.10/include/g++/stl_list.h:387: invalid type argument of `unary *'

[Banfa]

Your second listing compiles without error without alteration for me.

From what you've posted it looks like you are using v2.8.1 of the gcc compiler which is somewhat out of date, I am using version 4.4

invalid type argument of `unary *' means the the * (dereferencing) operator is being applied to a type that doesn't support it, for example this code produces this error at line 4

int main()
{
    int a = 600;
    int b = *a;
    return 0;
}
 

Are those the only errors your compilation is producing? I suggest you examine the code in the stl_list.h to see exactly what it is doing.

[philuu12]

Thanks, Banfa. I updated my compiler to a newer version, and it's compiling fine now.

Regards,