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meta: fix is_compatible/constructible traits (#3020)

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The previous version relied on the existence of an 'iterator' type.

As mentioned in comments, this is not the proper way to do it and
causes issues with certain types (e.g. views from range-v3).

Add a 'is_range' trait that properly detects the return type of
'begin'/'end', and use it in instead.
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Théo DELRIEU authored and GitHub committed 2021-10-07 12:32:25 +02:00
1 parent 62f2997b79
commit 80df5e8de6
7 files changed
+321 -132
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include/nlohmann/detail/macro_unscope.hpp
+1
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@@ -19,5 +19,6 @@
#undef NLOHMANN_BASIC_JSON_TPL_DECLARATION
#undef NLOHMANN_BASIC_JSON_TPL
#undef JSON_EXPLICIT
#undef NLOHMANN_CAN_CALL_STD_FUNC_IMPL
#include <nlohmann/thirdparty/hedley/hedley_undef.hpp>