With Visual C++ 2005 beta 2, I get the below compling error for the
following code. I think this error is not acceptable to me because
int::typeid is a constant and is known to compiler when compiling. Will VC++
2005 implement switch with case int::typeid in the final release?
error C2450: switch expression of type 'System::Type ^' is illegal
1> No user-defined-conversion operator available, or
1> Integral expression required
1>.\sproadapter .cpp(271) : error C2051: case expression not constant
Type ^t = obData->GetType();
switch (t)
{
case int::typeid:
break;
default:
break;
} 5 3118
I believe that C++ doesn't care about constantness, it just takes only int
(or type with implicit cast to int) argument.
"nobody" <no****@yahoo.c om> wrote in message
news:%2******** ********@TK2MSF TNGP09.phx.gbl. .. With Visual C++ 2005 beta 2, I get the below compling error for the following code. I think this error is not acceptable to me because int::typeid is a constant and is known to compiler when compiling. Will VC++ 2005 implement switch with case int::typeid in the final release?
error C2450: switch expression of type 'System::Type ^' is illegal
1> No user-defined-conversion operator available, or
1> Integral expression required
1>.\sproadapter .cpp(271) : error C2051: case expression not constant Type ^t = obData->GetType();
switch (t)
{
case int::typeid:
break;
default:
break;
}
nobody wrote: With Visual C++ 2005 beta 2, I get the below compling error for the following code. I think this error is not acceptable to me because int::typeid is a constant and is known to compiler when compiling. Will VC++ 2005 implement switch with case int::typeid in the final release?
No.
System::Type is not an integer type and therefore cannot be used as the type
of a switch/case regardless of real or apparent const-ness.
-cd
Consider the following code:
Type ^t = obData->GetType();
if(t == int::typeid)
{
//do something
}
else if(t == __int64::typeid )
{
Type ^t = obData->GetType();
}
else if(t == double::typeid)
{
Type ^t = obData->GetType();
}
else if(t == float::typeid)
{
Type ^t = obData->GetType();
}
else
{
}
If I can use switch, it will much better. Do you know any method to use
switch?
"Carl Daniel [VC++ MVP]" <cp************ *************** **@mvps.org.nos pam>
wrote in message news:%2******** ********@tk2msf tngp13.phx.gbl. .. nobody wrote: With Visual C++ 2005 beta 2, I get the below compling error for the following code. I think this error is not acceptable to me because int::typeid is a constant and is known to compiler when compiling. Will VC++ 2005 implement switch with case int::typeid in the final release?
No.
System::Type is not an integer type and therefore cannot be used as the type of a switch/case regardless of real or apparent const-ness.
-cd
> Consider the following code: If I can use switch, it will much better. Do you know any method to use switch?
No, you can't. Depending on what you're doing you might be able to implement
a table driven approach, but that's about it.
--
Tomas Restrepo to****@mvps.org http://www.winterdom.com/
nobody wrote: If I can use switch, it will much better. Do you know any method to use switch?
While everyone else is correct that this is not supported by the C++
language, you can request that it be supported (see link to feedback below).
This request is very similar to another feature which we do not support --
switch on strings. C# supports switch on strings. The code generated in both
your case and the string case would effectively be a series of if-then-else
statements.
--
Brandon Bray, Visual C++ Compiler http://blogs.msdn.com/branbray/
Bugs? Suggestions? Feedback? http://msdn.microsoft.com/productfeedback/ This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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