Subject: Re: [boost] [algorithm] aesthetic question about cxx11
From: lcaminiti (lorcaminiti_at_[hidden])
Date: 2012-03-10 11:44:05
> Stewart, Robert wrote
>> Marshall Clow wrote:
>>> On Feb 26, 2012, at 10:50 AM, lcaminiti wrote:
>>> > I have an aesthetic question. Boost.Algorithm puts C++11
>>> > algorithms like all_of into a directory
>>> > boost/algorithm/cxx11. Would the directory name
>>> > boost/algorithm/cpp11 be preferred?
>>> > I think for file names .cpp and .hpp are Boost choice over
>>> > .cxx and .hxx. But for directory names instead cxx11 is Boost
>>> > choice over cpp11? Similarly, shall macros that refer to
>>> > C++11 be named BOOST_..._CPP11_... or BOOST_..._CXX11_...?
>>> Just to let you know, the directory boost/algorithm/cxx11 has
>>> not been a part of any boost release yet (it will be part
>>> of1.50), so changing it should not break any existing code.
>>> As to using cxx11 vs cpp11, I don't really have a preference.
>> As Lorenzo notes, the suffixes suggest that the directory names should
>> use "cpp", too, but there is a difference. In "cxx11", the "cxx" is in
>> reference to a standard version, rather than to the language itself, so a
>> distinction might be appropriate.
>> I, too, don't really have a preference. However, the directories and
>> corresponding macros should use p/P or x/X consistently.
> 1. Yes, I should have pointed out that Algorithm uses cxx11 only in trunk
> so all options are on the table (no user code will brake if we change
> 2. Yes, as a user I'd be OK with "I use .cpp/.hpp for file names but
> cxx/CXX for naming the language standard".
> In the ScopeExit improvements I used a macro
> BOOST_SCOPE_EXIT_CONFIG_NO_CPP11 to force disabling implementation that
> uses C++11 features (lamba functions and auto declarations) even on C++11
> compilers. That's also just in the trunk so I can easily change it to
> Are there other Boost libraries (better if already released) that have
> used cpp/CPP over cxx/CXX to refer to the standard name? That could be
> used as a precedence to make a decision keeping consistency while braking
> no existing code.
It looks like other Boost libraries are using CXX (and not CPP):
Then I think we can proclame Boost convention to be .[ch]pp for file names,
CXX for macros, and cxx for directories (and also cxx for code symbol names
other than macros?).
Boost.Algorithm keeps cxx11 as the directory name and I change
BOOST_SCOPE_NO_CPP11 to BOOST_SCOPE_EXIT_NO_CXX11 in my Boost.ScopeExit
extensions in trunk.
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