Re: [Boost-users] [mpl] BOOST_MPL_ASSERT_MSG for static_assert

Subject: Re: [Boost-users] [mpl] BOOST_MPL_ASSERT_MSG for static_assert
From: Stefan Näwe (stefan.naewe_at_[hidden])
Date: 2014-07-23 09:30:10

Am 23.07.2014 15:04, schrieb Michael Powell:
> Hello,
> 
> I would like to add some diagnostic messages during compile time,
> potentially enumerating one or more types as well.
> 
> static_assert is great for simple messages but falls a bit short due
> to inability to list types and such.
> 
> I wonder if BOOST_MPL_ASSERT_MSG is the right answer, however, I am
> getting the following errors:
> 
> BOOST_MPL_ASSERT_MSG(
>     std::is_base_of<xnode, Node>::value
>     , "requested type is not a node"
>     , (types<node_type>)
>     );
> 
> 1>i:\source\kingdom software\cppxml\xml\domain\parts\xnode.h(111):
> warning C4002: too many actual parameters for macro
> 'BOOST_MPL_ASSERT_MSG'
> 

Try to play preprocessor yourself. How many commas do you
count in the invocation of BOOST_MPL_ASSERT_MSG ?

Stefan
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