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Steffen Liersch
Guest
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 Posted: Fri Nov 28, 2003 1:56 pm Post subject: Cannot create object derivated from SysUtils::Exception |
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Hello!
If I have the following class,
#include <SysUtils.hpp>
class SampleException : public Exception
{
};
I cannot throw an exception using the statement
throw SampleException("Error");
The compiler message is that there is not standard constructor available,
but I think it should be available because SampleException is derivated from
Exception and there is an constructor for type AnsiString. What's the
problem?
Thank you in advance,
Steffen Liersch
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Giuliano
Guest
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| Posted: Fri Nov 28, 2003 11:34 pm Post subject: Re: Cannot create object derivated from SysUtils::Exception |
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On Fri, 28 Nov 2003 14:56:22 +0100, "Steffen Liersch"
<steffen_liersch_pub (AT) gmx (DOT) de> wrote:
| Quote: | Hello!
If I have the following class,
#include
class SampleException : public Exception
{
};
I cannot throw an exception using the statement
throw SampleException("Error");
The compiler message is that there is not standard constructor available,
but I think it should be available because SampleException is derivated from
Exception and there is an constructor for type AnsiString. What's the
problem?
Thank you in advance,
Steffen Liersch
|
You have to call the base class contructor, e.g.
class SampleException : public Exception
{
public:
SampleException( AnsiString Text )
: Exception( Text ) {}
};
HTH
Regards
Giuliano
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Ivan Johansen
Guest
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| Posted: Fri Nov 28, 2003 11:42 pm Post subject: Re: Cannot create object derivated from SysUtils::Exception |
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Steffen Liersch wrote:
| Quote: | #include
class SampleException : public Exception
{
};
I cannot throw an exception using the statement
throw SampleException("Error");
The compiler message is that there is not standard constructor available,
but I think it should be available because SampleException is derivated from
Exception and there is an constructor for type AnsiString. What's the
problem?
|
You didn't write any constructors for SampleException. The compiler will
supply a default constructor and a copy constructor. If you want any
other constructors you must write them yourself. I guess what you want
is this:
class SampleException : public Exception
{
public:
SampleException(const AnsiString &Str)
: Exception(Str) {}
};
Ivan Johansen
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Remy Lebeau (TeamB)
Guest
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| Posted: Sat Nov 29, 2003 12:24 am Post subject: Re: Cannot create object derivated from SysUtils::Exception |
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"Steffen Liersch" <steffen_liersch_pub (AT) gmx (DOT) de> wrote
| Quote: | I cannot throw an exception using the statement
throw SampleException("Error");
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Works fine every time I've ever used custom exception classes like that.
| Quote: | The compiler message is that there is not standard constructor available
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You didn't provide any constructor for your class. You need to do that, ie:
class SampleException : public Exception
{
public:
__fastcall SampleException(const AnsiString Msg) : Exception(Msg) {}
};
| Quote: | but I think it should be available because SampleException is derivated
from
Exception and there is an constructor for type AnsiString.
|
For the Exception class, yes. Not for the SampleException class, no. In
C++, every class must provide its own constructors, they are not inherited
like they are in Delphi.
Gambit
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