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vector<>::iterator member of custom template class - Compile errors

Posted on 2002-04-14
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Last Modified: 2013-12-14
Hi!  I'm currently using gcc to create a template class that contains a vector from the STL and an iterator of that vector.  However, when I compile it, I get the error "Syntax error before ;" on the line I declare the iterator in the header.  When I make the class a non-template, the error seems to disappear.  Any ideas what the problem is??

template< T_EDGE_WEIGHT >
class DijkstraTable
{
 public:
  DijkstraTable( const vector< VertexIndex > & VertIs );
  struct Dij_inf
  {
    VertexIndex v;
    T_EDGE_WEIGHT d;
    VertexIndex p;
    bool k;
  };
  Dij_inf& operator[]( VertexIndex iV );
 private:
  vector<Dij_inf> m_Table;
  vector<Dij_inf>::iterator mp_CurRow; // Syntax Error
};
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Question by:Richwilli
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7 Comments
 
LVL 86

Expert Comment

by:jkr
ID: 6940396
Try

template< class T_EDGE_WEIGHT > // note the "class" statement
class DijkstraTable
{
public:
 DijkstraTable( const vector< VertexIndex > & VertIs );
 struct Dij_inf
 {
   VertexIndex v;
   T_EDGE_WEIGHT d;
   VertexIndex p;
   bool k;
 };
 Dij_inf& operator[]( VertexIndex iV );
private:
 vector<Dij_inf> m_Table;
 vector<Dij_inf>::iterator mp_CurRow; // Syntax Error
};
0
 
LVL 86

Expert Comment

by:jkr
ID: 6940397
Try

template< class T_EDGE_WEIGHT > // note the "class" statement
class DijkstraTable
{
public:
 DijkstraTable( const vector< VertexIndex > & VertIs );
 struct Dij_inf
 {
   VertexIndex v;
   T_EDGE_WEIGHT d;
   VertexIndex p;
   bool k;
 };
 Dij_inf& operator[]( VertexIndex iV );
private:
 vector<Dij_inf> m_Table;
 vector<Dij_inf>::iterator mp_CurRow; // Syntax Error
};
0
 
LVL 86

Expert Comment

by:jkr
ID: 6940399
Excuse the double post, but EE was a little "shaky" that moment...
0
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LVL 86

Expert Comment

by:jkr
ID: 6940868
BTW, just in case I didn't mention - it works that way :o)
0
 

Author Comment

by:Richwilli
ID: 6942207
Well, leaving out "class" was just my typo.  It's actually there in my code;  I simply missed that line when I copied and added it myself afterward.  So unless there's something else different about your version I don't notice, it still doesn't work.  Are you using the gcc compiler?
0
 
LVL 86

Accepted Solution

by:
jkr earned 300 total points
ID: 6942298
Tried it with both VC++ and g++, here's what I used:

#include <vector>

typedef int VertexIndex; // needed that, as no type info given in your sample

template< class T_EDGE_WEIGHT > // note the "class" statement
class DijkstraTable
{
public:
DijkstraTable( const vector< VertexIndex > & VertIs );
struct Dij_inf
{
  VertexIndex v;
  T_EDGE_WEIGHT d;
  VertexIndex p;
  bool k;
};
Dij_inf& operator[]( VertexIndex iV );
private:
vector<Dij_inf> m_Table;
vector<Dij_inf>::iterator mp_CurRow; // Syntax Error
};

0
 

Author Comment

by:Richwilli
ID: 6943095
You are quite right, it does work!  The problem must really lie elsewhere.  Thanks for your help.
0

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