Andrey Semashev 39b0f3a1fe Check that the type is an iterator in is_path_source_iterator. ...

This fixes hard compilation error when the passed type is not an iterator
at all. As a result, path constructors from iterators are no longer
selected by the compiler in overload resolution in users' code, when
the caller is passing an initializer list with a pair of non-iterator
elements. Added a test for this fix.

Also, use integral_constant to implement boolean type traits.

Fixes https://github.com/boostorg/filesystem/issues/287.

2023-05-21 17:27:12 +03:00

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