single_include compilation error about csv-parser

[viniciusjl]

Well, in the bug tracker header is written that the bug was fixed in g++ v5.1.0, but reading the bug tracker comments I saw that the bug was fixed in g++ v7.2.

So, it seems a compiler bug, what g++ version was used in csv tests?

[viniciusjl]

BTW, the include/internal/csv_row.hpp file was also modified the same way as single_include_test/csv.hpp file above.

[vincentlaucsb]

What version of g++ are you using? Seems like a compiler bug since the Travis build using g++ succeeds with std=c++11.

https://stackoverflow.com/questions/36489369/constexpr-non-static-member-function-with-non-constexpr-constructor-gcc-clang-d

[viniciusjl]

$ g++ --version
g++ (Debian 6.3.0-18+deb9u1) 6.3.0 20170516
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$

The bug reported in the link was fixed in g++ v5.1.0.

[viniciusjl]

BTW, using std=c++11 the problem still happens.

[vincentlaucsb]

https://travis-ci.org/vincentlaucsb/csv-parser/jobs/646741008

I use g++ 8. I'm thinking about applying a modification similar to yours based on g++ version since it's a simple fix, but I don't want to maintain g++ 5 compatibility forever. I'll think about it.

[viniciusjl]

I'm thinking to use clang v9 instead g++, but first I have to check the modification cost.

[vincentlaucsb]

Fixed by #179