Vicente Botet wrote:
> Message du 24/03/11 01:01 > De : "Lorenzo Caminiti" > A : boost@lists.boost.org > Copie à : > Objet : [boost] [type_traits] MSVC rejects typename -- why? > > Hello all, > > The following code compiles on GCC (v3.4.3) but it does not on MSVC > (cl.exe v14): > > #include > > template > void f(T& x) { > struct s { > T g() { > // GCC needs this typename but MSVC does not -- why?? > typename boost::remove_reference::type i = 0; > return i; > } > }; > x = s().g(); > } > > MSVC does not accept the `typename` inside `s::g` because it says it's > not within a template (but I think it is within a template...). GCC > instead requires that `typename`. > > Which compiler is right? (What does the standard say?) How do I > program this code so it works on all compilers?
here is a macro BOOST_TYPENAME in Boost.Config that was used for this purposes with old compilers.
I tried BOOST_DEDUCED_TYPENAME but it still does not work on my MSVC compiler... is this a problem with Boost.Config? #include <boost/type_traits.hpp> #include <boost/config.hpp> template void f(T& x) { struct s { T g() { BOOST_DEDUCED_TYPENAME boost::remove_reference<T&>::type i = 0; return i; } }; x = s().g(); } int main() { int x; f(x); return 0; } E:\sandbox\boost-sandbox-local\libs\local\example>cl /EHs /I..\..\.. /I"c:\Progr am Files\boost\boost_1_46_1" 02.cpp Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50727.42 for 80x86 Copyright (C) Microsoft Corporation. All rights reserved. 02.cpp 02.cpp(9) : error C2899: typename cannot be used outside a template declaration Thanks. --Lorenzo -- View this message in context: http://boost.2283326.n4.nabble.com/type-traits-MSVC-rejects-typename-why-tp3... Sent from the Boost - Dev mailing list archive at Nabble.com.