Trying to update some legacy code

Hello, I have recently decided to try and get an old project dusted off and see if I can update it to a newer compiler and C++ version. The project will compile without issues in VC 6.0 but I'm trying to get it working with C++ 11 or 14. I've come across an issue with a template I don't understand. I get no errors until I attempt to compile, then the following code throws errors on line 89 and 223.
"syntax error: identifier 'CGenMapAssoc'"


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#ifndef __DLMAP_H
#define __DLMAP_H

#define DLMAP_DEFAULTSIZE 1009
typedef void* MAPPOSITION;

template<class TKey, class TValue, class TKeyArg>
class TGenMap {
  struct CGenMapAssoc {
	CGenMapAssoc* pNext;
	dword	      HashValue;
	TKey	      Key;
	TValue        Value;
   };

protected:
  CGenMapAssoc** m_ppHashTable;
  dword		 m_RecordCount;
  dword		 m_HashTableSize;
  bool		 m_DeleteValues;

protected:
  virtual CGenMapAssoc* GetAssocNode (TKeyArg Key, dword& Hash);
  virtual CGenMapAssoc* NewAssocNode (void);

public:
  TGenMap();
  virtual ~TGenMap() { Destroy(); }
  virtual void Destroy (void);
  virtual void Delete (TKeyArg Key);
  virtual TValue GetFirstRecord (MAPPOSITION& Position);
  virtual TValue GetNextRecord  (MAPPOSITION& Position);
  virtual TValue GetFirstRecordKey (TKeyArg Key, MAPPOSITION& Position);
  virtual TValue GetNextRecordKey  (TKeyArg Key, MAPPOSITION& Position);
  virtual dword GetNumRecords (void) { return (m_RecordCount); }
  virtual void InitHashTable (const dword Size);
  virtual bool Lookup (TKeyArg Key, TValue& Record);
  virtual void RemoveAll (void);
  virtual void SetAt (TKeyArg Key, TValue& Record);
};

template<class TKey, class TValue, class TKeyArg>
class TGenRefMap : public TGenMap<TKey, TValue, TKeyArg> {
public:
  TGenRefMap() { m_DeleteValues = false; }
};

template<class TKey, class TValue, class TKeyArg>
TGenMap<TKey, TValue, TKeyArg>::TGenMap () {
  m_ppHashTable   = NULL;
  m_RecordCount   = 0;
  m_HashTableSize = DLMAP_DEFAULTSIZE;
  m_DeleteValues  = true;
}

template<class TKey, class TValue, class TKeyArg>
inline void TGenMap<TKey, TValue, TKeyArg>::Destroy (void) {
  RemoveAll();
 }

template<class TKey, class TValue, class TKeyArg>
void TGenMap<TKey, TValue, TKeyArg>::Delete (TKeyArg Key) {
  CGenMapAssoc* pAssoc;
  CGenMapAssoc* pLastAssoc = NULL;
  dword         Hash;

  Hash = HashKey(Key) % m_HashTableSize;
  if (m_ppHashTable == NULL) return;
  
  for (pAssoc = m_ppHashTable[Hash]; pAssoc != NULL; pAssoc = pAssoc->pNext) {

    if (CompareKeys(pAssoc->Key, Key)) {

      if (pLastAssoc != NULL) 
        pLastAssoc->pNext = pAssoc->pNext;
      else
        m_ppHashTable[Hash] = pAssoc->pNext;

      if (m_DeleteValues) { DestroyPointer(pAssoc->Value); }
      DestroyPointer(pAssoc);
      return;
     }

    pLastAssoc = pAssoc;
   }
 }

template<class TKey, class TValue, class TKeyArg>
TGenMap<TKey, TValue, TKeyArg>::CGenMapAssoc* TGenMap<TKey, TValue, TKeyArg>::GetAssocNode (TKeyArg Key, dword& Hash) { // ERROR ON COMPILE
  CGenMapAssoc* pAssoc;

  Hash = HashKey(Key) % m_HashTableSize;
  if (m_ppHashTable == NULL) return (NULL);
  
  for (pAssoc = m_ppHashTable[Hash]; pAssoc != NULL; pAssoc = pAssoc->pNext) {
    if (CompareKeys(pAssoc->Key, Key)) return pAssoc;
   }

  return (NULL);
 }

template<class TKey, class TValue, class TKeyArg>
TValue TGenMap<TKey, TValue, TKeyArg>::GetFirstRecord (MAPPOSITION& Position) {
  CGenMapAssoc* pAssoc;
  dword	       Index;

  Position = (MAPPOSITION) NULL;
  if (m_ppHashTable == NULL) return (NULL);

  for (Index = 0; Index < m_HashTableSize; ++Index) {
    pAssoc = m_ppHashTable[Index];
    
    if (pAssoc != NULL) {
      Position = (MAPPOSITION) pAssoc;
      return (pAssoc->Value);
     }
   }
  return (NULL);
 }

template<class TKey, class TValue, class TKeyArg>
TValue TGenMap<TKey, TValue, TKeyArg>::GetNextRecord (MAPPOSITION& Position) {
  CGenMapAssoc* pAssoc;
  dword	       Index;

  pAssoc = (CGenMapAssoc *) Position;
  if (m_ppHashTable == NULL) return (NULL);
  if (pAssoc        == NULL) return (NULL);

  pAssoc = pAssoc->pNext;

  if (pAssoc != NULL) {
    Position = (MAPPOSITION) pAssoc;
    return (pAssoc->Value);
   }

  for (Index = pAssoc->HashValue + 1; Index < m_HashTableSize; ++Index) {
    pAssoc = m_ppHashTable[Index]; 
    
    if (pAssoc != NULL) {
      Position = (MAPPOSITION) pAssoc;
      return (pAssoc->Value);
     }
   }

  Position = (MAPPOSITION) NULL;
  return (NULL);
 }

template<class TKey, class TValue, class TKeyArg>
TValue TGenMap<TKey, TValue, TKeyArg>::GetFirstRecordKey (TKeyArg Key, MAPPOSITION& Position) {
  CGenMapAssoc* pAssoc;
  dword	        Hash;

  Position = (MAPPOSITION) NULL;
  if (m_ppHashTable == NULL) return (NULL);

  Hash     = HashKey(Key) % m_HashTableSize;
  pAssoc   = m_ppHashTable[Hash];

  while (pAssoc) {
    Position = (MAPPOSITION) pAssoc;
    if (CompareKeys(pAssoc->Key, Key)) return (pAssoc->Value);
    pAssoc = pAssoc->pNext;
  }

  Position = NULL;
  return (NULL);
 }

template<class TKey, class TValue, class TKeyArg>
TValue TGenMap<TKey, TValue, TKeyArg>::GetNextRecordKey (TKeyArg Key, MAPPOSITION& Position) {
  CGenMapAssoc* pAssoc;

  pAssoc = (CGenMapAssoc *) Position;
  if (m_ppHashTable == NULL) return (NULL);
  if (pAssoc        == NULL) return (NULL);

  pAssoc = pAssoc->pNext;

  while (pAssoc) {
    Position = (MAPPOSITION) pAssoc;
    if (CompareKeys(pAssoc->Key, Key)) return (pAssoc->Value);
    pAssoc = pAssoc->pNext;
  }

  Position = NULL;
  return (NULL);
 }

template<class TKey, class TValue, class TKeyArg>
void TGenMap<TKey, TValue, TKeyArg>::InitHashTable (const dword Size) {
  DEFINE_FUNCTION("TGenMap::InitHashTable()");
  
	/* Clear the current table if any */
  DestroyArrayPointer(m_ppHashTable);

	/* Allocate the new hash table */ 
  m_HashTableSize = Size;
  m_ppHashTable   = new CGenMapAssoc* [m_HashTableSize];
  ValidateNewPointer(m_ppHashTable);
  m_RecordCount   = 0;
  memset(m_ppHashTable, 0, sizeof(CGenMapAssoc*) * m_HashTableSize);
 }

template<class TKey, class TValue, class TKeyArg>
bool TGenMap<TKey, TValue, TKeyArg>::Lookup (TKeyArg Key, TValue& Record) {
  CGenMapAssoc* pAssoc;
  dword        Hash;

  pAssoc = GetAssocNode(Key, Hash);

  if (pAssoc == NULL) {
    Record = NULL;
    return (false);
   }

  Record = pAssoc->Value;
  return (true);
 }

template<class TKey, class TValue, class TKeyArg>
TGenMap<TKey, TValue, TKeyArg>::CGenMapAssoc* TGenMap<TKey, TValue, TKeyArg>::NewAssocNode (void) { // ERROR ON COMPILE
  DEFINE_FUNCTION("TGenMap::NewAssocNode()");
  TGenMap::CGenMapAssoc* pAssoc;

  CreatePointer(pAssoc, CGenMapAssoc);
  return (pAssoc);
 }

template<class TKey, class TValue, class TKeyArg>
void TGenMap<TKey, TValue, TKeyArg>::RemoveAll (void) {
  DEFINE_FUNCTION("TGenMap::RemoveAll()");
  CGenMapAssoc*	pAssoc;
  CGenMapAssoc*	pAssoc1;
  dword		Index;

  if (m_ppHashTable != NULL) {
    for (Index = 0; Index < m_HashTableSize; ++Index) {
      for (pAssoc = m_ppHashTable[Index]; pAssoc != NULL; ) {
        pAssoc1 = pAssoc->pNext;

	if (m_DeleteValues) { DestroyPointer(pAssoc->Value); }
        DestroyPointer(pAssoc);

        pAssoc = pAssoc1;
       }
     }

    DestroyArrayPointer(m_ppHashTable);
    m_ppHashTable = NULL;
   }

  m_RecordCount = 0;
 }

template<class TKey, class TValue, class TKeyArg>
void TGenMap<TKey, TValue, TKeyArg>::SetAt (TKeyArg Key, TValue& Record) {
  CGenMapAssoc* pAssoc;
  dword         Hash;

  pAssoc = GetAssocNode(Key, Hash);

  if (pAssoc == NULL) {
    if (m_ppHashTable == NULL) InitHashTable(m_HashTableSize);

    pAssoc = NewAssocNode();
    pAssoc->HashValue = Hash;
    pAssoc->Key       = Key;

    pAssoc->pNext       = m_ppHashTable[Hash];
    m_ppHashTable[Hash] = pAssoc;
    ++m_RecordCount;
   }

  pAssoc->Value = Record;
 }

inline bool CompareKeys (dword Key1, dword Key2) {
  return (Key1 == Key2);
}

inline bool CompareKeys (const char* Key1, const char* Key2) {
  return (StringCompare(Key1, Key2, false) == 0);
}

inline dword HashKey (dword Key) {
  return (Key >> 4);
}

inline dword HashKey (const char* Key) {
  dword nHash = 0;

  while (*Key) {
    nHash = (nHash << 5) + nHash + tolower(*Key);
    ++Key;
   }

  return nHash;
}

#endif 


Sorry for the massive code block.
Last edited on
I am attempting to simplify your code a bit because I don't feel like plugging in all that. I am hoping that my excerpt is still the root cause of your problem.

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// Example program

using dword = unsigned int;

template<class TKey, class TValue, class TKeyArg>
class TGenMap {
    
    struct CGenMapAssoc {
        CGenMapAssoc* pNext;
        dword HashValue;
        TKey Key;
        TValue Value;
    };
    
    CGenMapAssoc* GetAssocNode (TKeyArg Key, dword& Hash);
};

template<class TKey, class TValue, class TKeyArg>
TGenMap<TKey, TValue, TKeyArg>::CGenMapAssoc*
TGenMap<TKey, TValue, TKeyArg>::GetAssocNode (TKeyArg Key, dword& Hash) { // ERROR ON COMPILE

    return nullptr;

}

int main() { }


The error here is
19:1: error: need 'typename' before 'TGenMap<TKey, TValue, TKeyArg>::CGenMapAssoc' because 'TGenMap<TKey, TValue, TKeyArg>' is a dependent scope


To fix this, add 'typename', like the compiler suggests:
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template<class TKey, class TValue, class TKeyArg>
typename TGenMap<TKey, TValue, TKeyArg>::CGenMapAssoc*
TGenMap<TKey, TValue, TKeyArg>::GetAssocNode (TKeyArg Key, dword& Hash) { 

    return nullptr; // replace with actual code, of course

}
Last edited on
Thank you for your speedy reply! Adding typename seems to have fixed that issue for me, thank you very much! Got some more errors to fix now ^_^
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