Re: [boost] [Config] Meaning of BOOST_NO_CXX11_HDR_INITIALIZER_LIST

Subject: Re: [boost] [Config] Meaning of BOOST_NO_CXX11_HDR_INITIALIZER_LIST
From: Michel Morin (mimomorin_at_[hidden])
Date: 2012-03-10 11:27:53

Let's go back again to the BOOST_NO_CXX11_HDR_INITIALIZER_LIST discussion.

I believe that BOOST_NO_UNIFIED_INITIALIZATION_SYNTAX
checks the compiler support of initializer_list as well.
So better implementation of BOOST_NO_CXX11_HDR_INITIALIZER_LIST
would be:

1. In compiler configs, don't define BOOST_NO_CXX11_HDR_INITIALIZER_LIST.

2. In stdlib configs, define BOOST_NO_CXX11_HDR_INITIALIZER_LIST
if stdlib doesn't have <initializer_list>.

3. In suffix.hpp, define BOOST_NO_CXX11_HDR_INITIALIZER_LIST
if BOOST_NO_UNIFIED_INITIALIZATION_SYNTAX is defined (and
BOOST_NO_CXX11_HDR_INITIALIZER_LIST is not defined):
    #if defined(BOOST_NO_UNIFIED_INITIALIZATION_SYNTAX)
    && !defined(BOOST_NO_CXX11_HDR_INITIALIZER_LIST)
    #  define BOOST_NO_CXX11_HDR_INITIALIZER_LIST
    #endif

I also came up with another thoughts.
Do we really want BOOST_NO_CXX11_HDR_INITIALIZER_LIST
to check the compiler support of initializer_list?
Even if BOOST_NO_CXX11_HDR_INITIALIZER_LIST checks
only the existence of <initializer_list>, we can check both
the compiler support and the header existence by
    defined(BOOST_NO_UNIFIED_INITIALIZATION_SYNTAX) ||
    defined(BOOST_NO_CXX11_HDR_INITIALIZER_LIST)

Comments?

Regards,
Michel