Annex C (informative) Compatibility [diff]

C.6 C standard library [diff.library]

C.6.2 Modifications to definitions [diff.mods.to.definitions]

C.6.2.1 Types char16_­t and char32_­t [diff.char16]

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The types char16_­t and char32_­t are distinct types rather than typedefs to existing integral types.
The tokens char16_­t and char32_­t are keywords in this International Standard.
They do not appear as macro or type names defined in <cuchar> ([cuchar.syn]).

C.6.2.2 Type wchar_­t [diff.wchar.t]

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The type wchar_­t is a distinct type rather than a typedef to an existing integral type.
The token wchar_­t is a keyword in this International Standard.
It does not appear as a macro or type name defined in any of <cstddef> ([cstddef.syn]), <cstdlib> ([cstdlib.syn]), or <cwchar> ([cwchar.syn]).

C.6.2.3 Header <assert.h> [diff.header.assert.h]

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The token static_­assert is a keyword in this International Standard ([lex.key]).
It does not appear as a macro name defined in <cassert> ([cassert.syn]).

C.6.2.4 Header <iso646.h> [diff.header.iso646.h]

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The tokens and, and_­eq, bitand, bitor, compl, not, not_­eq, or, or_­eq, xor, and xor_­eq are keywords in this International Standard, and are not introduced as macros by <iso646.h> ([depr.iso646.h.syn]).

C.6.2.5 Header <stdalign.h> [diff.header.stdalign.h]

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The token alignas is a keyword in this International Standard ([lex.key]), and is not introduced as a macro by <stdalign.h> ([depr.stdalign.h.syn]).

C.6.2.6 Header <stdbool.h> [diff.header.stdbool.h]

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The tokens bool, true, and false are keywords in this International Standard, and are not introduced as macros by <stdbool.h> ([depr.stdbool.h.syn]).

C.6.2.7 Macro NULL [diff.null]

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The macro NULL, defined in any of <clocale> ([clocale.syn]), <cstddef> ([cstddef.syn]), <cstdio> ([cstdio.syn]), <cstdlib> ([cstdlib.syn]), <cstring> ([cstring.syn]), <ctime> ([ctime.syn]), or <cwchar> ([cwchar.syn]), is an implementation-defined C++ null pointer constant in this International Standard ([support.types]).