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Jakob Reuter
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 Posted: Sun Sep 28, 2003 10:36 pm Post subject: Templates |
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Hi,
i am working on a generic BinTrie class, and i got a problem :/...
Error:
main.cpp:37: error: request for member 'insert' in 'Trie()', which is of
non-aggregate of Type 'BinT()()'
Code:
main.cpp:
....
36 BinT Trie();
37 Trie.insert();
BinTrie.h:
typedef std::vector<bool> BitString;
template<class T=char,class Key=BitString> class BinTrie
{
public:
typedef Key key_type;
typedef T mapped_type;
typedef std::pair<mapped_type,const key_type> value_type;
iterator insert();
...
};
typedef BinTrie<char,BitString> BinT;
#include "BinTrie.cxx"
BinTrie.cxx
template<class T,class Key>
BinTrie<T,Key>::BinTrie(){}
template<class T,class Key>
BinTrie<T,Key>::~BinTrie(){}
template<class T,class Key>
class BinTrie<T,Key>::iterator BinTrie<T,Key>::insert(){
cout << "insert" << endl;
}
It seems that i messed something up with the template initialisation but i
am not sure what??
thx for any clue
cheers
Jakob
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Dietmar Kuehl
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| Posted: Mon Sep 29, 2003 9:35 pm Post subject: Re: Templates |
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Jakob Reuter wrote:
| Quote: | template<class T,class Key
class BinTrie
^^^^^ |
This should read "typename" instead: the keywords "typename" and
"class" are only interchangable in the declaration of the template
parameters. In this context, they are definitely not interchangable.
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Sebastian Kapfer
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| Posted: Mon Sep 29, 2003 9:37 pm Post subject: Re: Templates |
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On Sun, 28 Sep 2003 18:36:41 -0400, Jakob Reuter wrote:
| Quote: | Code:
main.cpp:
...
36 BinT Trie();
|
This line of code declares a function called "Trie" which takes no
arguments and returns a BinT.
Remove the parentheses and it will do what you intended.
BinT Trie;
Another possibility:
BinT Trie = BinT(); // initialize Trie from a
// default-constructed BinT
| Quote: | main.cpp:37: error: request for member 'insert' in 'Trie()', which is of
non-aggregate of Type 'BinT()()'
^^^^ |
Note the two pairs of parentheses, indicating a function reference.
--
Best Regards, | Wer Windows-Rechner ins Internet lässt,
Sebastian | braucht nicht über SWEN stänkern!
| Quote: | --------------------------------------------------------
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Ulrich Eckhardt
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| Posted: Mon Sep 29, 2003 9:56 pm Post subject: Re: Templates |
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Jakob Reuter wrote:
| Quote: | i am working on a generic BinTrie class, and i got a problem :/...
|
You mean a 'tree', no?
| Quote: | main.cpp:
...
36 BinT Trie();
|
This is the declaration of a function called 'Trie', taking no parameters
and returning a 'BinT'. What you want is
BinT Trie;
cheers
Uli
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