[lmi-commits] [lmi] master ddca1f5 4/5: Refactor for reuse

[Greg Chicares]

branch: master
commit ddca1f551cad87e7b5848a9d46cea6306a727c38
Author: Gregory W. Chicares <address@hidden>
Commit: Gregory W. Chicares <address@hidden>

    Refactor for reuse
    
    A constexpr distinguishing two's complement will be needed for
    handling other integer representations.
---
 bourn_cast.hpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/bourn_cast.hpp b/bourn_cast.hpp
index b4812cf..eed2530 100644
--- a/bourn_cast.hpp
+++ b/bourn_cast.hpp
@@ -157,8 +157,8 @@ inline To bourn_cast(From from, std::true_type, 
std::false_type)
     static_assert(to_traits::is_integer && !from_traits::is_integer, "");
     static_assert(to_traits::digits < from_traits::max_exponent, "");
 
-    // Integral type must be two's complement.
-    static_assert(~To(0) == -To(1), "");
+    static constexpr bool is_twos_complement(~To(0) == -To(1));
+    static_assert(is_twos_complement, "");
 
     static From const volatile raw_max = From(to_traits::max());
     static From const volatile adj_max = raw_max + From(1);