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authorMattias Andrée <maandree@operamail.com>2015-10-13 02:01:56 +0200
committerMattias Andrée <maandree@operamail.com>2015-10-13 02:03:37 +0200
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parentinfo: non-returning functions (diff)
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info: stdalign.h
Signed-off-by: Mattias Andrée <maandree@operamail.com>
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-rw-r--r--doc/info/chap/language-facilities.texinfo29
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diff --git a/doc/info/chap/language-facilities.texinfo b/doc/info/chap/language-facilities.texinfo
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--- a/doc/info/chap/language-facilities.texinfo
+++ b/doc/info/chap/language-facilities.texinfo
@@ -7,6 +7,7 @@
* Alternative tokens:: Alternative spellings of common operators.
* Booleans:: Proper booleans in the C programming language.
* Non-returning functions:: Specifying that functions never return.
+* Variable alignment:: Aligment of variables and data types.
@end menu
@@ -160,3 +161,31 @@ by @code{slibc}. If you want to use both, GCC
supports @code{__attribute__((__noreturn__))} as
a synonym for @code{__attribute__((noreturn))}.
+
+
+@node Variable alignment
+@section Variable alignment
+
+@hfindex stdalign.h
+@cpindex Variable alignment
+@cpindex Alignment, variables
+@cpindex @code{alignas}
+@fnindex @code{alignof}
+@cpindex @code{_Alignas}
+@fnindex @code{_Alignof}
+The @sc{ISO}@tie{}C11 added a variable qualifier
+and a function used to specify the aligned of
+variable, and retrieve the alignment of a type,
+respectively, These are called @code{_Alignas}
+and @code{_Alignof}, by including the header file
+@file{<stdalign.h>}, the macros @code{alignas}
+and @code{alignof}, that alias this keywords, are
+defined.
+
+Declaring a variable with the qualifier
+@code{alignas(TYPE)} specifies that the variable
+should have the alignment of the type @code{TYPE}.
+
+The function call @code{alignof(TYPE)}, returns
+the alignment of the type @code{TYPE}.
+