boost/type_traits/config.hpp
My compiler issues the following warning message (boost v1.29.0, G++ 3.2 with warning level high): boost_1_29_0/boost/type_traits/config.hpp:90:55: warning: "BOOST_MSVC" is not defined boost/type_traits/config.hpp: line 90 is: # if (........ || BOOST_MSVC > 1301 || ........) Shouldn't it be as follows? # if (........ || #defined(BOOST_MSVC) && BOOST_MSVC > 1301 || ........) H. Morishima
"H. Morishima" <yg-boost-users@m.gmane.org> wrote in message news:aqa8hd$cue$1@main.gmane.org...
My compiler issues the following warning message (boost v1.29.0, G++ 3.2 with warning level high):
boost_1_29_0/boost/type_traits/config.hpp:90:55: warning: "BOOST_MSVC" is not defined
boost/type_traits/config.hpp: line 90 is:
# if (........ || BOOST_MSVC > 1301 || ........)
It should work fine as is.
Shouldn't it be as follows?
# if (........ || #defined(BOOST_MSVC) && BOOST_MSVC > 1301 || ........)
If an identifier is not defined, it should expand to 0 on a #if (or #elif) directive line. The only reason you sometimes see what you have above (minus the extra # before 'defined') is that sometimes the macro actually expands to 0. This should be fine: #if BOOST_MSVC Provided that either BOOST_MSVC is *not* defined, or it expands to a numeric expression that the preprocessor can handle.
H. Morishima
Paul Mensonides
Thanks, Paul I got a new knowledge on preprocessor macro expansion. H. Morishima
In article <aqbksj$q56$1@main.gmane.org>, Paul Mensonides wrote: <snip>
This should be fine:
#if BOOST_MSVC
Provided that either BOOST_MSVC is *not* defined, or it expands to a numeric expression that the preprocessor can handle.
Even better, a test on BOOST_MSVC+0 works even if the definition of BOOST_MSVC is blank. This technique is used in a few places in Boost.
Fixed thanks. John Maddock http://ourworld.compuserve.com/homepages/john_maddock/index.htm
My compiler issues the following warning message (boost v1.29.0, G++ 3.2 with warning level high):
boost_1_29_0/boost/type_traits/config.hpp:90:55: warning: "BOOST_MSVC" is not defined
boost/type_traits/config.hpp: line 90 is:
# if (........ || BOOST_MSVC > 1301 || ........)
Shouldn't it be as follows?
# if (........ || #defined(BOOST_MSVC) && BOOST_MSVC > 1301 || ........)
H. Morishima
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Thanks, John Though it was not an error actually (pointed out by Paul Mensonides), by your fix, I won't be bothered by warning messages in the next release. H. Morishima
participants (1)
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Ben Hutchings -
H. Morishima
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John Maddock -
Paul Mensonides