Usage of class forward declarations;

[Belebele]

Why is the code below giving an error in VC++ 8? Why would the
compiler need to see the definition of Foo to compile:

class Foo;
Foo& g();
void f()
{
g(); // error: use of undefined type 'Foo'
}
?

Thanks

[=?UTF-8?B?RXJpayBXaWtzdHLDtm0=?=]

On 2008-08-29 16:33, Belebele wrote:

Why is the code below giving an error in VC++ 8? Why would the
compiler need to see the definition of Foo to compile:

class Foo;
Foo& g();
void f()
{
g(); // error: use of undefined type 'Foo'
}

Because g() returns an object of type Foo, which means that the compiler
needs to know how to create such an object.

--
Erik Wikström

[Paavo Helde]

Belebele <be******@gmail.comkirjutas:

Why is the code below giving an error in VC++ 8? Why would the
compiler need to see the definition of Foo to compile:

class Foo;
Foo& g();
void f()
{
g(); // error: use of undefined type 'Foo'
}

This compiles with gcc and Comeau online, so I guess this is a VC++ bug.

regards
Paavo

[Juha Nieminen]

Erik Wikström wrote:

On 2008-08-29 16:33, Belebele wrote:

>Why is the code below giving an error in VC++ 8? Why would the
compiler need to see the definition of Foo to compile:

class Foo;
Foo& g();
void f()
{
g(); // error: use of undefined type 'Foo'
}

Because g() returns an object of type Foo, which means that the compiler
needs to know how to create such an object.

Actually it returns a reference of type Foo.