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libcxx_old/TODO.TXT

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This is meant to be a general place to list things that should be done "someday"
CXX Runtime Library Tasks
=========================
* Fix that CMake always link to /usr/lib/libc++abi.dylib on OS X.
* Look into mirroring libsupc++'s typeinfo vtable layout when libsupc++/libstdc++
is used as the runtime library.
* Investigate and document interoperability between libc++ and libstdc++ on
linux. Do this for every supported c++ runtime library.
Atomic Related Tasks
====================
* future should use <atomic> for synchronization.
Test Suite Tasks
================
* Improve the quality and portability of the locale test data.
* Convert failure tests to use Clang Verify.
Filesystem Tasks
================
* P0492r2 - Implement National body comments for Filesystem
* INCOMPLETE - US 25: has_filename() is equivalent to just !empty()
* INCOMPLETE - US 31: Everything is defined in terms of one implicit host system
* INCOMPLETE - US 32: Meaning of 27.10.2.1 unclear
* INCOMPLETE - US 33: Definition of canonical path problematic
* INCOMPLETE - US 34: Are there attributes of a file that are not an aspect of the file system?
* INCOMPLETE - US 35: What synchronization is required to avoid a file system race?
* INCOMPLETE - US 36: Symbolic links themselves are attached to a directory via (hard) links
* INCOMPLETE - US 37: The term “redundant current directory (dot) elements” is not defined
* INCOMPLETE - US 38: Duplicates §17.3.16
* INCOMPLETE - US 39: Remove note: Dot and dot-dot are not directories
* INCOMPLETE - US 40: Not all directories have a parent.
* INCOMPLETE - US 41: The term “parent directory” for a (non-directory) file is unusual
* INCOMPLETE - US 42: Pathname resolution does not always resolve a symlink
* INCOMPLETE - US 43: Concerns about encoded character types
* INCOMPLETE - US 44: Definition of path in terms of a string requires leaky abstraction
* INCOMPLETE - US 45: Generic format portability compromised by unspecified root-name
* INCOMPLETE - US 46: filename can be empty so productions for relative-path are redundant
* INCOMPLETE - US 47: “.” and “..” already match the name production
* INCOMPLETE - US 48: Multiple separators are often meaningful in a root-name
* INCOMPLETE - US 49: What does “method of conversion method” mean?
* INCOMPLETE - US 50: 27.10.8.1 ¶ 1.4 largely redundant with ¶ 1.3
* INCOMPLETE - US 51: Failing to add / when appending empty string prevents useful apps
* INCOMPLETE - US 52: remove_filename() postcondition is not by itself a definition
* INCOMPLETE - US 53: remove_filename()'s name does not correspond to its behavior
* INCOMPLETE - US 54: remove_filename() is broken
* INCOMPLETE - US 55: replace_extension()'s use of path as parameter is inappropriate
* INCOMPLETE - US 56: Remove replace_extension()'s conditional addition of period
* INCOMPLETE - US 57: On Windows, absolute paths will sort in among relative paths
* INCOMPLETE - US 58: parent_path() behavior for root paths is useless
* INCOMPLETE - US 59: filename() returning path for single path components is bizarre
* INCOMPLETE - US 60: path("/foo/").filename()==path(".") is surprising
* INCOMPLETE - US 61: Leading dots in filename() should not begin an extension
* INCOMPLETE - US 62: It is important that stem()+extension()==filename()
* INCOMPLETE - US 63: lexically_normal() inconsistently treats trailing "/" but not "/.." as directory
* INCOMPLETE - US 73, CA 2: root-name is effectively implementation defined
* INCOMPLETE - US 74, CA 3: The term “pathname” is ambiguous in some contexts
* INCOMPLETE - US 75, CA 4: Extra flag in path constructors is needed
* INCOMPLETE - US 76, CA 5: root-name definition is over-specified.
* INCOMPLETE - US 77, CA 6: operator/ and other appends not useful if arg has root-name
* INCOMPLETE - US 78, CA 7: Member absolute() in 27.10.4.1 is overspecified for non-POSIX-like O/S
* INCOMPLETE - US 79, CA 8: Some operation functions are overspecified for implementation-defined file types
* INCOMPLETE - US 185: Fold error_code and non-error_code signatures into one signature
* INCOMPLETE - FI 14: directory_entry comparisons are members
* INCOMPLETE - Late 36: permissions() error_code overload should be noexcept
* INCOMPLETE - Late 37: permissions() actions should be separate parameter
* INCOMPLETE - Late 42: resize_file() Postcondition missing argument
Misc Tasks
==========
* Find all sequences of >2 underscores and eradicate them.
* run clang-tidy on libc++
* Document the "conditionally-supported" bits of libc++
* Look at basic_string's move assignment operator, re LWG 2063 and POCMA
* Put a static_assert in std::allocator to deny const/volatile types (LWG 2447)