[PATCH] LWG 3171: restore stream insertion for filesystem::directory_entry

[Jonathan Wakely]

        * include/bits/fs_dir.h (operator<<): Overload for directory_entry,
        as per LWG 3171.
        * testsuite/27_io/filesystem/directory_entry/lwg3171.cc: New test.

Tested x86_64-linux, committed to trunk.



commit 0d24038c0b565dbcd5e7729423398da281245c41
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Tue Dec 18 16:47:52 2018 +0000

    LWG 3171: restore stream insertion for filesystem::directory_entry
    
            * include/bits/fs_dir.h (operator<<): Overload for directory_entry,
            as per LWG 3171.
            * testsuite/27_io/filesystem/directory_entry/lwg3171.cc: New test.

diff --git a/libstdc++-v3/include/bits/fs_dir.h 
b/libstdc++-v3/include/bits/fs_dir.h
index 2f81a1709e4..90bdf7305f8 100644
--- a/libstdc++-v3/include/bits/fs_dir.h
+++ b/libstdc++-v3/include/bits/fs_dir.h
@@ -300,6 +300,14 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
     friend class directory_iterator;
     friend class recursive_directory_iterator;
 
+    // _GLIBCXX_RESOLVE_LIB_DEFECTS
+    // 3171. LWG 2989 breaks directory_entry stream insertion
+    template<typename _CharT, typename _Traits>
+      friend basic_ostream<_CharT, _Traits>&
+      operator<<(basic_ostream<_CharT, _Traits>& __os,
+                const directory_entry& __d)
+      { return __os << __d.path(); }
+
     directory_entry(const filesystem::path& __p, file_type __t)
     : _M_path(__p), _M_type(__t)
     { }