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Ook
Guest
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 Posted: Sat Oct 29, 2005 6:07 pm Post subject: Compile error: no appropriate default constructor available |
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Here is my code, can some kind soul tell me what I'm doing wrong, or why I
get this compile error, and maybe what to do to prevent it? I think I must
be missing some fundamental concept here, or maybe the syntax is just not
quite right?
template <typename T>
class DList
{
public:
DList(){};
};
class Polynomial2 : public DList
{
public:
Polynomial2(){};
};
int main()
{
return 0;
}
I'm getting compile error:
'DList' : no appropriate default constructor available
at
Polynomial2(){};
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Valentin Samko
Guest
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| Posted: Sat Oct 29, 2005 6:10 pm Post subject: Re: Compile error: no appropriate default constructor availa |
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Ook wrote:
| Quote: | Here is my code, can some kind soul tell me what I'm doing wrong, or why I
get this compile error, and maybe what to do to prevent it? I think I must
be missing some fundamental concept here, or maybe the syntax is just not
quite right?
template <typename T
class DList
{
public:
DList(){};
};
class Polynomial2 : public DList
{
public:
Polynomial2(){};
};
int main()
{
return 0;
}
|
DList is a template class, i.e. it requires a template parameter.
Your class Polynomial2 inherits from DList, and you did not specify the template parameter
for DList. For example, you could have
class Polynomial2 : public DList
--
Valentin Samko - http://www.valentinsamko.com
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Jonathan Mcdougall
Guest
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| Posted: Sat Oct 29, 2005 6:14 pm Post subject: Re: Compile error: no appropriate default constructor availa |
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Ook wrote:
| Quote: | Here is my code, can some kind soul tell me what I'm doing wrong, or why I
get this compile error, and maybe what to do to prevent it? I think I must
be missing some fundamental concept here, or maybe the syntax is just not
quite right?
template <typename T
class DList
{
public:
DList(){};
};
class Polynomial2 : public DList
|
class DList does *not* exist. A family of classes bearing the name
DList exists and to get one of these classes, you must specify its
template parameters:
class P : public DList
What do you think templates are for? This is such a simple example, and
yet you don't understand it. Either this is too advanced for you, or
your textbook (you do have one, don't you?) is scrap.
| Quote: | {
public:
Polynomial2(){};
};
int main()
{
return 0;
}
I'm getting compile error:
'DList' : no appropriate default constructor available
|
That's a poorly diagnosed message. What this means is that the template
DList must have an argument list.
Jonathan
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Ook
Guest
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| Posted: Sat Oct 29, 2005 6:33 pm Post subject: Re: Compile error: no appropriate default constructor availa |
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"Valentin Samko" <c++.moderated (AT) digiways (DOT) com> wrote
| Quote: | Ook wrote:
Here is my code, can some kind soul tell me what I'm doing wrong, or why
I get this compile error, and maybe what to do to prevent it? I think I
must be missing some fundamental concept here, or maybe the syntax is
just not quite right?
template <typename T
class DList
{
public:
DList(){};
};
class Polynomial2 : public DList
{
public:
Polynomial2(){};
};
int main()
{
return 0;
}
DList is a template class, i.e. it requires a template parameter.
Your class Polynomial2 inherits from DList, and you did not specify the
template parameter for DList. For example, you could have
class Polynomial2 : public DList
--
Valentin Samko - http://www.valentinsamko.com
|
Holy moly, 60 seconds and there is an answer here!!! Yes, that is what I was
missing - so, let me make sure I understand. Since Polynomial2 inherits from
DList, then I specify the type of item DList takes, or I make Polynomial2
also a template class so I can do this.
template <typename T>
class DList
{
public:
DList(){};
};
template <typename T>
class Polynomial2 : public DList<T>
.....
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Alf P. Steinbach
Guest
|
| Posted: Sat Oct 29, 2005 6:35 pm Post subject: Re: Compile error: no appropriate default constructor availa |
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* "Ook" <Ook Don't send me any freakin' spam at zootal dot com delete
the Don't send me any freakin' spam>:
| Quote: | Here is my code, can some kind soul tell me what I'm doing wrong, or why I
get this compile error, and maybe what to do to prevent it? I think I must
be missing some fundamental concept here, or maybe the syntax is just not
quite right?
template
class DList
{
public:
DList(){};
};
class Polynomial2 : public DList
{
public:
Polynomial2(){};
};
int main()
{
return 0;
}
I'm getting compile error:
'DList' : no appropriate default constructor available
at
Polynomial2(){};
|
The reason is that you don't use indentation and whitespace in general.
Combined with a compiler that gives you a very misleading error.
The syntax is absolutely not quite right: note that DList is a template
class, then check your usage...
--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?
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Valentin Samko
Guest
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| Posted: Sat Oct 29, 2005 6:57 pm Post subject: Re: Compile error: no appropriate default constructor availa |
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Ook wrote:
| Quote: | DList is a template class, i.e. it requires a template parameter.
Your class Polynomial2 inherits from DList, and you did not specify the
template parameter for DList. For example, you could have
class Polynomial2 : public DList<int> .
Holy moly, 60 seconds and there is an answer here!!! Yes, that is what I was
missing - so, let me make sure I understand. Since Polynomial2 inherits from
DList, then I specify the type of item DList takes, or I make Polynomial2
also a template class so I can do this.
template
class DList
{
public:
DList(){};
};
template
class Polynomial2 : public DList
|
Yes, in both cases you specify the type.
--
Valentin Samko - http://www.valentinsamko.com
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