| Title: | C++ |
| Notice: | Read 1.* and use keywords (e.g. SHOW KEY/FULL KIT_CXX_VAX_VMS) |
| Moderator: | DECCXX::AMARTIN |
| Created: | Fri Nov 06 1987 |
| Last Modified: | Thu Jun 05 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 3604 |
| Total number of notes: | 18242 |
Can we have better diagnostics for templates and incomplete classes?
From the source you can see that the error is not in line 2 or line 17. It
is caused by Foo<Incomplete> and FooBar<Incomplete>. VC++ does a better job
it names the incomplete classes. This makes it easier to find the real
problem.
Hartmut
$ type x.cxx
template <class FooType> class Foo {
FooType foo;
};
class Incomplete;
class Complete {
int i;
};
Foo<int> iFoo;
Foo<float> fFoo;
Foo<void*> vFoo;
Foo<Complete> completeFoo;
Foo<Incomplete> incompleteFoo;
template <class FooBarType> class FooBar: public FooBarType {
int i;
};
FooBar<Complete> completeFooBar;
FooBar<Incomplete> incompleteFooBar;
$ cxx x
FooType foo;
................^
%CXX-E-INCOMPMEM, The member "foo" has an incomplete type.
at line number 2 in file USER$DISK:[BECKER]X.CXX;4
template <class FooBarType> class FooBar: public FooBarType {
.................................................^
%CXX-E-INCOMPBASE, In this declaration, the incomplete type "FooBarType" is used
as a base class.
at line number 17 in file USER$DISK:[BECKER]X.CXX;4
$ cxx/ver/noobj nl:
DEC C++ V5.5-017 on OpenVMS Alpha V7.1
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 3480.1 | Noted | DECCXX::AMARTIN | Alan H. Martin | Mon Mar 10 1997 14:18 | 2 |
Sounds like a good idea to me. /AHM | |||||
| 3480.2 | Is this any better? from v6.0 prototype | WIDTH::MDAVIS | Mark Davis - compiler maniac | Mon Mar 10 1997 15:06 | 12 |
tagged 146% exx -c ~/c++/cpp3480.cxx
cxx: Error: /usr/users/mdavis/c++/cpp3480.cxx, line 2: incomplete type is not
allowed
detected during instantiation of class "Foo<Incomplete>" at line 15
FooType foo;
----------------^
cxx: Error: /usr/users/mdavis/c++/cpp3480.cxx, line 17: incomplete type is not
allowed
detected during instantiation of class "FooBar<Incomplete>" at line 22
template <class FooBarType> class FooBar: public FooBarType {
-------------------------------------------------^
2 errors detected in the compilation of "/usr/users/mdavis/c++/cpp3480.cxx".
| |||||
| 3480.3 | better! | MUCTEC::BECKER | Hartmut B., VMS & Languages, Munich | Tue Mar 11 1997 06:58 | 4 |
That's exactly what I'm missing. The reference to the instantiation would have saved (me and our partner) some time. Now I'm longing for V6. Hartmut | |||||
| 3480.4 | DECC::FOLTAN | Tue Mar 11 1997 15:25 | 5 | ||
Hartmut, Actually this improvement will be coming in DEC C++ V5.6. Thanks for pointing this out to us. | |||||