Re: [boost] [Accumulators + Signals2] Compilation error with GCC when both are used

Subject: Re: [boost] [Accumulators + Signals2] Compilation error with GCC when both are used
From: Frank Mori Hess (frank.hess_at_[hidden])
Date: 2011-06-09 09:20:41

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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).

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