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>

diff --git a/man7/system_data_types.7 b/man7/system_data_types.7
index 92e5ab4f14810dcc8d37295921cad681e1a022a7..e3a3856a297aab254f03905802054a98330b51bc 100644 (file)
--- a/man7/system_data_types.7
+++ b/man7/system_data_types.7
@@ -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