https://bugs.llvm.org/show_bug.cgi?id=48507
Bug ID: 48507
Summary: Type traits error in c++17 version
Product: libc++
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: krylov.yaros...@gmail.com
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
Here is the two strings code using type traits:
```
#include "nlohmann/json.hpp"
static_assert( std::is_copy_assignable<nlohmann::ordered_json>::value, "" );
```
https://godbolt.org/z/4eqjas
It works perfectly with libstdc++, and it works with libc++ using c++11 or
c++14.
But libc++ with c++17 can't compile this code. I tried to dig into problem, to
find the difference between c++17 and non-c++17 in libc++ headers, I tried to
dig into nlohmann json to extract minimal example, but failed.
Root issue on Github: https://github.com/nlohmann/json/issues/2491
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