On Thu, Jun 9, 2011 at 3:20 PM, Frank Mori Hess <frank.hess@nist.gov> wrote:
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On Thursday, June 09, 2011, sguazt wrote:
I get the following errors: --- [error] --- In file included from ./boost-trunk/boost/signals2.hpp:20:0, from boost_signals2_accumulators.cpp:4: ./boost-trunk/boost/signals2/signal_type.hpp:29:2: error: #error This header requires BOOST_PARAMETER_MAX_ARITY to be defined as 7 or greater prior to including Boost.Parameter headers
BOOST_PARAMETER_MAX_ARITY is a user-definable macro used by Boost.Parameter. boost/signals2/signal_type.hpp needs it to be at least 7, but will only set it to 7 if it hasn't already been defined by the user or by an earlier include of the Boost.Parameter headers (which is probably done by the Accumulators library). So you need to either define BOOST_PARAMETER_MAX_ARITY to 7 or more (preferably as a compiler option so it is done before any includes), or take some care to either not include signal_type.hpp or make sure it gets included before boost/parameter/config.hpp (which will default define the macro to 5).
Gordon and Frank, Thank you very much for your quick reply. Indeed, setting BOOST_PARAMETER_MAX_ARITY to 7 seems to fix. Hope this "design issue" (?!?) will be fixed later... From the macro name, it seems something related to the emulation of C++0x variable template parameters. Thank you very much! Best, -- Marco