external_constructor<std::valarray>: Handle empty array properly
Clang UBSAN complains with the following message when an empty std::valarray is passed in:
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/valarray:571:14 in
2/2 Test #68: test-regression_all ..............***Failed 4.68 sec
/usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/valarray:571:14: runtime error: reference binding to null pointer of type 'const do
uble'
#0 0x6fbe57 in std::valarray<double>::operator[](unsigned long) const /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/valarray:
571:7
#1 0x6fbe57 in double const* std::begin<double>(std::valarray<double> const&) /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/v
alarray:1207
#2 0x6fbe57 in void nlohmann::detail::external_constructor<(nlohmann::detail::value_t)2>::construct<nlohmann::basic_json<std::map, std::vector, s
td::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long, unsigned long, double, std::allocator, nlohmann::adl_seri
alizer>, double, 0>(nlohmann::basic_json<std::map, std::vector, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool
, long, unsigned long, double, std::allocator, nlohmann::adl_serializer>&, std::valarray<double> const&) /home/firma/devel/json/include/nlohmann/deta
il/conversions/to_json.hpp:157
#3 0x5e3fe3 in void nlohmann::detail::to_json<nlohmann::basic_json<std::map, std::vector, std::__cxx11::basic_string<char, std::char_traits<char>
, std::allocator<char> >, bool, long, unsigned long, double, std::allocator, nlohmann::adl_serializer>, double, 0>(nlohmann::basic_json<std::map, std
::vector, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long, unsigned long, double, std::allocator, nlohman
n::adl_serializer>&, std::valarray<double> const&) /home/firma/devel/json/include/nlohmann/detail/conversions/to_json.hpp:270:5
#4 0x5e3fe3 in decltype((to_json(fp, std::forward<std::valarray<double>&>(fp0))) , ((void)())) nlohmann::detail::to_json_fn::operator()<nlohmann:
:basic_json<std::map, std::vector, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long, unsigned long, double
, std::allocator, nlohmann::adl_serializer>, std::valarray<double>&>(nlohmann::basic_json<std::map, std::vector, std::__cxx11::basic_string<char, std
::char_traits<char>, std::allocator<char> >, bool, long, unsigned long, double, std::allocator, nlohmann::adl_serializer>&, std::valarray<double>&) c
onst /home/firma/devel/json/include/nlohmann/detail/conversions/to_json.hpp:334
#5 0x5e3fe3 in decltype((nlohmann::(anonymous namespace)::to_json(fp, std::forward<std::valarray<double>&>(fp0))) , ((void)())) nlohmann::adl_ser
ializer<std::valarray<double>, void>::to_json<nlohmann::basic_json<std::map, std::vector, std::__cxx11::basic_string<char, std::char_traits<char>, st
d::allocator<char> >, bool, long, unsigned long, double, std::allocator, nlohmann::adl_serializer>, std::valarray<double>&>(nlohmann::basic_json<std:
:map, std::vector, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long, unsigned long, double, std::allocator
, nlohmann::adl_serializer>&, std::valarray<double>&) /home/firma/devel/json/include/nlohmann/adl_serializer.hpp:45
#6 0x5e3fe3 in nlohmann::basic_json<std::map, std::vector, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool,
long, unsigned long, double, std::allocator, nlohmann::adl_serializer>::basic_json<std::valarray<double>&, std::valarray<double>, 0>(std::valarray<d
ouble>&) /home/firma/devel/json/include/nlohmann/json.hpp:1257
#7 0x5e3fe3 in _DOCTEST_ANON_FUNC_2() /home/firma/devel/json/test/src/unit-regression.cpp:1377
#8 0x77313e in doctest::Context::run() /home/firma/devel/json/test/thirdparty/doctest/doctest.h:5938:21
#9 0x777ae0 in main /home/firma/devel/json/test/thirdparty/doctest/doctest.h:6016:71
#10 0x7fae220532e0 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x202e0)
#11 0x4a6479 in _start (/home/firma/devel/json/build/test/test-regression+0x4a6479)
The important thing to note here is that a std::valarray is *not* a STL
container, so the usual containter and iterator semantics don't apply.
Therefore we have to check if the container is non-empty before.
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