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system_data_types.7: Add double_t 

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Alejandro Colomar 2020-09-25 13:22:18 +02:00 committed by Michael Kerrisk
parent fa712444b4
commit 55e24f06a0
1 changed files with 42 additions and 0 deletions
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man7/system_data_types.7
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@ -117,6 +117,48 @@ Conforming to: C99 and later; POSIX.1-2001 and later.
.IP
See also:
.BR div (3)
.\"------------------------------------- double_t ---------------------/
.TP
.I double_t
.IP
Include:
.IR <math.h> .
.IP
The implementation's most efficient floating type at least as wide as
.IR double .
Its type depends on the value of the macro
.BR FLT_EVAL_METHOD ,
defined in
.IR <float.h> :
.RS
.TP
0
.I double_t
is
.IR double .
.TP
1
.I double_t
is
.IR double .
.TP
2
.I double_t
is
.IR "long double" .
.IP
For other values of
.BR FLT_EVAL_METHOD ,
the type of
.I double_t
is implementation-defined.
.RE
.IP
Conforming to: C99 and later; POSIX.1-2001 and later.
.IP
See also the
.I float_t
type in this page.
.\"------------------------------------- fenv_t -----------------------/
.TP
.I fenv_t