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Guest
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 Posted: Tue Sep 26, 2006 9:10 am Post subject: What would this defintion mean: int Function(class CString f |
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Just curious, any one know what the 3 part parameter "class CString
filename" would mean.
The code:
int TestFunc(class CString filename)
{
fopen(filename, "w");
}
Compile using Visaul C++, there is no complain about the defintion. But
the following error:
error C2664: 'fopen' : cannot convert parameter 1 from 'CString' to
'const char *'
Source or target has incomplete type
I know if I remove "class" in parameter list, the function just compile
fine. But what would it mean if I keep "class" there?
Any hint? |
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Greg
Guest
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| Posted: Tue Sep 26, 2006 9:10 am Post subject: Re: What would this defintion mean: int Function(class CStri |
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huguogang (AT) gmail (DOT) com wrote:
| Quote: | Just curious, any one know what the 3 part parameter "class CString
filename" would mean.
The code:
int TestFunc(class CString filename)
{
fopen(filename, "w");
}
|
It means that "CString" is the name of a class - the class of the
"filename" parameter that is passed by value to the implementation of
the function TestFunc().
| Quote: | Compile using Visaul C++, there is no complain about the defintion. But
the following error:
error C2664: 'fopen' : cannot convert parameter 1 from 'CString' to
'const char *'
Source or target has incomplete type
I know if I remove "class" in parameter list, the function just compile
fine. But what would it mean if I keep "class" there?
|
Are you sure that removing the keyword "class" fixes the compiler
error? It's not impossible, but it would have to mean that "CString" is
not in fact the name of a class as the parameter declaration claims.
Instead CString would have to be the name of a typedef.
Now the error that the compiler reports is it cannot find the
definition of the class CString. And the compiler must have CString's
class definition because filename, a CString parameter, is being passed
by value to TestFunc.
So the upshot is that either the keyword "class" as it is being used
here is either being completely unnecessary or it is being entirely
unhelpful.
Greg |
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Guest
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| Posted: Mon Oct 02, 2006 9:10 am Post subject: Re: What would this defintion mean: int Function(class CStri |
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The code is from an old project I am trying to port to VC7.1. Obviously
VC6.0 has no problem with the grammer.
In another similar place. I got a compiler error complaining about
undefined class CString.
This probably has something to do with the change of CString from a
real class definition to a typedef in VC7.1.
Greg wrote:
| Quote: | huguogang (AT) gmail (DOT) com wrote:
Just curious, any one know what the 3 part parameter "class CString
filename" would mean.
The code:
int TestFunc(class CString filename)
{
fopen(filename, "w");
}
It means that "CString" is the name of a class - the class of the
"filename" parameter that is passed by value to the implementation of
the function TestFunc().
Compile using Visaul C++, there is no complain about the defintion. But
the following error:
error C2664: 'fopen' : cannot convert parameter 1 from 'CString' to
'const char *'
Source or target has incomplete type
I know if I remove "class" in parameter list, the function just compile
fine. But what would it mean if I keep "class" there?
Are you sure that removing the keyword "class" fixes the compiler
error? It's not impossible, but it would have to mean that "CString" is
not in fact the name of a class as the parameter declaration claims.
Instead CString would have to be the name of a typedef.
Now the error that the compiler reports is it cannot find the
definition of the class CString. And the compiler must have CString's
class definition because filename, a CString parameter, is being passed
by value to TestFunc.
So the upshot is that either the keyword "class" as it is being used
here is either being completely unnecessary or it is being entirely
unhelpful.
Greg |
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Jim Langston
Guest
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| Posted: Mon Oct 02, 2006 9:10 am Post subject: Re: What would this defintion mean: int Function(class CStri |
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I think it probably has something to do with the fact that VC 6.0 is
notorious for not following the current standard. 7.1 much closly follows
the standard.
<huguogang (AT) gmail (DOT) com> wrote in message
news:1159769372.250011.247870 (AT) e3g2000cwe (DOT) googlegroups.com...
| Quote: | The code is from an old project I am trying to port to VC7.1. Obviously
VC6.0 has no problem with the grammer.
In another similar place. I got a compiler error complaining about
undefined class CString.
This probably has something to do with the change of CString from a
real class definition to a typedef in VC7.1.
Greg wrote:
huguogang (AT) gmail (DOT) com wrote:
Just curious, any one know what the 3 part parameter "class CString
filename" would mean.
The code:
int TestFunc(class CString filename)
{
fopen(filename, "w");
}
It means that "CString" is the name of a class - the class of the
"filename" parameter that is passed by value to the implementation of
the function TestFunc().
Compile using Visaul C++, there is no complain about the defintion. But
the following error:
error C2664: 'fopen' : cannot convert parameter 1 from 'CString' to
'const char *'
Source or target has incomplete type
I know if I remove "class" in parameter list, the function just compile
fine. But what would it mean if I keep "class" there?
Are you sure that removing the keyword "class" fixes the compiler
error? It's not impossible, but it would have to mean that "CString" is
not in fact the name of a class as the parameter declaration claims.
Instead CString would have to be the name of a typedef.
Now the error that the compiler reports is it cannot find the
definition of the class CString. And the compiler must have CString's
class definition because filename, a CString parameter, is being passed
by value to TestFunc.
So the upshot is that either the keyword "class" as it is being used
here is either being completely unnecessary or it is being entirely
unhelpful.
Greg
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