>From the example in 7.3.4.1 (international standard
ISO/IEC 14882) we can conclude that
the names introduced by using directive hide
the names in higer level namespaces instead of
resulting in an ill-formed code.
In the source code attached __false_type should
be recognized correctly as comming from namespace
_STL and should not conflict with the top level
definition of __false_type. This is so since
namespace std contains using namepsace _STL and
the namespace _STL contains definition of
__false_type too.
Below is part of preprocesed file
$ gcc --version
gcc (GCC) 4.0.0 20050319 (prerelease)
compile command :
c++ -pthread -fexceptions -I../stlport -W -Wno-sign-compare \
-Wno-unused -Wno-uninitialized -D_STLP_USE_GLIBC \
-O0 -gstabs+ -g3 -fPIC -D_STLP_DEBUG -fPIC complex_exp.cpp \
-c -o ../lib/obj/GCC-LINUX/DebugSTLD/complex_exp.o
next was cut from preprocesed complex_exp.i.cpp:
namespace std { }
namespace __std_alias = std;
namespace _STL {}
namespace std {
using namespace _STL;
}
namespace _STL {
using namespace __std_alias;
}
namespace _STL {
struct __true_type {};
struct __false_type {};
template <int _Is> struct __bool2type {
typedef __false_type _Ret; // this is OK
};
template<>
struct __bool2type<1> { typedef __true_type _Ret; }; // this is OK
}
namespace _STL {}
namespace std {
using namespace _STL;
}
struct __true_type { };
struct __false_type { };
namespace std
{
template<bool>
struct __truth_type
{ typedef __false_type __type; }; // should be OK too, but report error:
'__false_type' does not name a type
template<>
struct __truth_type<true>
{ typedef __true_type __type; }; // should be OK too, but report error:
'__true_type' does not name a type
}
Whole file is too long (20000 row) - if it is needed please let me know,
I will send it.
(OS is Fedora core 3 at Linux kernel 2.6.9-1.667 #1 Tue Nov 2 14:41:25 EST 2004
i686 i686 i386 GNU/Linux)
--
Summary: namespace bug
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: jozef at syncad dot com
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20687
