C++20 support by removing swap specialization#2176

Merged

nlohmann merged 2 commits intonlohmann:developfrom gracicot:cpp20-support-no-std-fct-templ-specialization

Jun 21, 2020

+80-5

Commits on Jun 6, 2020

Disable std::swap specialization in C++20 and added a friend swap function
gracicot
committed
Adapted unit tests to use ADL calls for swap like the new swappable concept
gracicot
committed