[llvm-bugs] [Bug 24567] New: basic_filebuf non-standard constructor/open functions for taking an open FILE stream

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=24567

            Bug ID: 24567
           Summary: basic_filebuf non-standard constructor/open functions
                    for taking an open FILE stream
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: welten at gmx.de
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com
    Classification: Unclassified

Created attachment 14773
  --> https://llvm.org/bugs/attachment.cgi?id=14773&action=edit
patch that adds FILE* constructor/open function to basic_filebuf

Currently it is not possible to construct a C++ stream for an already open
file.

Some other C++ libraries offer non-standard extensions like 

__gnu_cxx::stdio_filebuf from ext/stdio_filebuf.h

in the libstdc++.

Given that the current implementation of basic_filebuf uses a FILE stream
internally it is easily possibly to add an alternative constructor and open
function that takes an already open FILE stream.

Attached is a patch containing a straight forward approach to add this
functionality.

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