-----Original Message----- From: Boost [mailto:boost-bounces@lists.boost.org] On Behalf Of Beman Dawes Sent: 11 June 2016 17:06 To: Boost Developers List Subject: Re: [boost] enabling constexpr with Visual studio 2015 Update 3 (RC)
On Sat, Jun 11, 2016 at 11:57 AM, Glen Fernandes <glen.fernandes@gmail.com> wrote:
On Sat, Jun 11, 2016 at 11:41 AM, Paul A. Bristow wrote:
Do I need to also add #define BOOST_CXX14_CONSTEXPR in my program or elsewhere? (Doing this doesn't change BOOST_CONSTEXPR_OR_CONST from const to constexpr)
In develop, you have the option of defining BOOST_MSVC_CXX11_CONSTEXPR.
+1.
You might want to read the thread "[config] Changes needed for VC++ 2015 Update 3?" if you have not already done so.
Please file a MSVC bug report if you hit any C++11 constexpr bugs in the Update 3 RC. They giving very high priority to C++11 bugs affecting Boost code. They would like us to be able to turn BOOST_NO_CXX11_CONSTEXPR off for Update 3.
I'm using a just-fully-updated modular-boost develop branch. I've re-read https://groups.google.com/forum/#!topic/boost-developers-archive/yzERahUyJRE and added either or both #define BOOST_CXX14_CONSTEXPR #define BOOST_MSVC_CXX14_CONSTEXPR but when I hover over BOOST_CONSTEXPR_OR_CONST it still shows const rather than constexpr and I am not getting an (unsuccessful so far) attempt to implement constexpr 1>fixed_point_constexpr.cpp(61): error C2127: 'bn1': illegal initialization of 'constexpr' entity with a non-constant expression that would be shown if I was misunderstanding the meaning of the hover display. So I'm doing something wrong still. (In case it helps, the code only contains #include <boost/fixed_point/fixed_point.hpp> #include <boost/math/special_functions/bernoulli.hpp> typedef boost::fixed_point::negatable<6u, -25, boost::fixed_point::round::nearest_even> small_fixed_point_type; constexpr small_fixed_point_type bn1 = boost::math::bernoulli_b2n<small_fixed_point_type>(1); I'm hoping, perhaps over-optimistically, for a fixed-point value of ==0.1666667 to be assigned to bn1) Paul --- Paul A. Bristow Prizet Farmhouse Kendal UK LA8 8AB +44 (0) 1539 561830