A VC8 bug£¿

[miaohua1982]

the programme is as follows
#include <iostream>
using namespace std;

void f( const char*p){cout<<" const char * "<<p<<endl; }
void f( char*p){cout<<" char * "<<p<<endl; }

int main()
{
f("hello");

try{
throw "hello";
}catch(char *p){
cout<<"char * "<<p<<endl;
}catch(const char *p){
cout<<"const char * "<<p<<endl;
}
}
in VC8 it's output is:
const char * hello
char * hello

I don't think it's a corrent answer, since "hello" has a type of "const
char*".then I change to the Intel CPP Compiler 9.the result is :
const char * hello
const char * hello

so it's a VC8's bug? But it seems impossible that vc8 does such a
stupid mistake.

[Gianni Mariani]

mi*********@gma il.com wrote:

the programme is as follows
#include <iostream>
using namespace std;

void f( const char*p){cout<<" const char * "<<p<<endl; }
void f( char*p){cout<<" char * "<<p<<endl; }

int main()
{
f("hello");

try{
throw "hello";
}catch(char *p){
cout<<"char * "<<p<<endl;
}catch(const char *p){
cout<<"const char * "<<p<<endl;
}
}
in VC8 it's output is:
const char * hello
char * hello

I don't think it's a corrent answer, since "hello" has a type of "const
char*".then I change to the Intel CPP Compiler 9.the result is :
const char * hello
const char * hello

so it's a VC8's bug? But it seems impossible that vc8 does such a
stupid mistake.

Changing the order of the catch statements results in the VC8 saying this:

xxcharp.cpp
xxcharp.cpp(15) : error C2312: 'char *' : is caught by 'const char *' on
line 13

Changing the caught pointers to pointer references also results in the
same error message.

gcc 3.4.4 behaves how you would expect.

I don't have a copy of the standard with me so I can't tell if it's
conforming but I would guess that VC8 is broken.

[peter koch]

mi*********@gma il.com skrev:

the programme is as follows
#include <iostream>
using namespace std;

void f( const char*p){cout<<" const char * "<<p<<endl; }
void f( char*p){cout<<" char * "<<p<<endl; }

int main()
{
f("hello");

try{
throw "hello";
}catch(char *p){
cout<<"char * "<<p<<endl;
}catch(const char *p){
cout<<"const char * "<<p<<endl;
}
}
in VC8 it's output is:
const char * hello
char * hello

I don't think it's a corrent answer, since "hello" has a type of "const
char*".then I change to the Intel CPP Compiler 9.the result is :
const char * hello
const char * hello

so it's a VC8's bug? But it seems impossible that vc8 does such a
stupid mistake.

I believe that this is related to the standards requirement that
implicitly casts away const on char* (allowing common legacy code such
as char* test = "hello" to compile), that kicks in.
It requires a language lawyer to resolve with greater confidence,
however. If noone pops up here, I recommend you to take it to
comp.lang.c++.m oderated.

/Peter

[Gianni Mariani]

peter koch wrote:

mi*********@gma il.com skrev:

....

>so it's a VC8's bug? But it seems impossible that vc8 does such a
stupid mistake.

I believe that this is related to the standards requirement that
implicitly casts away const on char* (allowing common legacy code such
as char* test = "hello" to compile), that kicks in.
It requires a language lawyer to resolve with greater confidence,
however. If noone pops up here, I recommend you to take it to
comp.lang.c++.m oderated.

That's only for string literals. In this case the VC8 compiler has the
same error when thowing a "const char *" value;

[peter koch]

Gianni Mariani skrev:

peter koch wrote:

mi*********@gma il.com skrev:

...

so it's a VC8's bug? But it seems impossible that vc8 does such a
stupid mistake.

I believe that this is related to the standards requirement that
implicitly casts away const on char* (allowing common legacy code such
as char* test = "hello" to compile), that kicks in.
It requires a language lawyer to resolve with greater confidence,
however. If noone pops up here, I recommend you to take it to
comp.lang.c++.m oderated.

That's only for string literals.

Right. I should have mentioned that to be specific. But it is a string
literal that was thrown, and I guess that type might decay to char* as
well.

In this case the VC8 compiler has the
same error when thowing a "const char *" value;

Okay. Then its not it. One more bug in VC8. I wonder why I never had
any problems with that compiler.

/Peter