Doesn't compile under C++17

[iphydf]

no type named 'string_view' in namespace 'std'

You need to #include <string_view> somewhere.

[gregmarr]

See #735 There are compilers that support the C++17 flag but don't have a <string_view> header in the standard library that is being used. Others have it as <experimental/string_view>, while most include it in <string> which is included, and so it gets included that way.
What compiler and standard library are you using?

[iphydf]

clang-5.0 and libstdc++ from gcc 6.3.0 (__GLIBCXX__=20170516). It does not in fact seem to provide <string_view>, so including it won't fix the problem.

[nlohmann]

Could you try to include <experimental/string_view> before including json.hpp?

[nlohmann]

Closing this issue as it is a duplicate of #735.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.