Annex C (informative) Compatibility [diff]

C.2 C++ and ISO C++ 2003 [diff.cpp03]

C.2.8 [library]: library introduction [diff.cpp03.library]

Affected: [library][thread]
Change: New reserved identifiers.

Rationale: Required by new features.

Effect on original feature: Valid C++ 2003 code that uses any identifiers added to the C++ standard library by this International Standard may fail to compile or produce different results in this International Standard.
A comprehensive list of identifiers used by the C++ standard library can be found in the Index of Library Names in this International Standard.
Affected subclause: [headers]
Change: New headers.

Rationale: New functionality.

Effect on original feature: The following C++ headers are new: <array>, <atomic>, <chrono>, <codecvt>, <condition_­variable>, <forward_­list>, <future>, <initializer_­list>, <mutex>, <random>, <ratio>, <regex>, <scoped_­allocator>, <system_­error>, <thread>, <tuple>, <typeindex>, <type_­traits>,
<unordered_­map>, and <unordered_­set>.
In addition the following C compatibility headers are new: <ccomplex>, <cfenv>, <cinttypes>, <cstdalign>, <cstdbool>, <cstdint>, <ctgmath>, and <cuchar>.
Valid C++ 2003 code that #includes headers with these names may be invalid in this International Standard.
Affected subclause: [swappable.requirements]
Effect on original feature: Function swap moved to a different header
Rationale: Remove dependency on <algorithm> for swap.

Effect on original feature: Valid C++ 2003 code that has been compiled expecting swap to be in <algorithm> may have to instead include <utility>.
Affected subclause: [namespace.posix]
Change: New reserved namespace.

Rationale: New functionality.

Effect on original feature: The global namespace posix is now reserved for standardization.
Valid C++ 2003 code that uses a top-level namespace posix may be invalid in this International Standard.
Affected subclause: [res.on.macro.definitions]
Change: Additional restrictions on macro names.

Rationale: Avoid hard to diagnose or non-portable constructs.

Effect on original feature: Names of attribute identifiers may not be used as macro names.
Valid C++ 2003 code that defines override, final, carries_­dependency, or noreturn as macros is invalid in this International Standard.