Peculiar bug when converting int's to std::strings using MSVC 2015

Hello all,

I've got the following bit of code, it compiles under all compilers
I've tried (gcc, clang, msvc (10,15,17), intel).

https://gist.github.com/anonymous/e9a7eafbbddf3cc8289f7346329126ab

The problem seems to only occur under msvc2105 Update3 release build.
All other compilers/versions and debug/release builds all give a
correct result.

Here are the first few outputs:

cmd> spirit.exe
ERROR s1:-4254967296    s2:-40000000
ERROR s1:-4254967297    s2:-39999999
ERROR s1:-4254967298    s2:-39999998
ERROR s1:-4254967299    s2:-39999997
ERROR s1:-4254967300    s2:-39999996
ERROR s1:-4254967301    s2:-39999995

I was wondering if anyone else can replicate this on an MSVC 2015 u3
release build? Or is there something wrong in the code - I've been
using that particular conversion routine for several years now.



Regards,
Arash


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