[stream.types] Move subclause near the start of [iostreams]

Correct footnote about how uses of streamsize relate to C.

Author: jwakely

source/iostreams.tex

@@ -56,6 +56,42 @@
 \tcode{imbue},
 the behavior is undefined.
 
+\rSec2[stream.types]{Types}
+
+\indexlibraryglobal{streamoff}%
+\begin{itemdecl}
+using streamoff = @\impdefx{type of \tcode{streamoff}}@;
+\end{itemdecl}
+
+\begin{itemdescr}
+\pnum
+The type \tcode{streamoff} is a synonym for one of the signed basic integral types of
+sufficient size to represent the maximum possible file size for the operating system.
+\begin{footnote}
+Typically \tcode{long long}.
+\end{footnote}
+\end{itemdescr}
+
+\indexlibraryglobal{streamsize}%
+\begin{itemdecl}
+using streamsize = @\impdef@;
+\end{itemdecl}
+
+\begin{itemdescr}
+\pnum
+The type
+\tcode{streamsize}
+is a synonym for one of the signed basic
+integral types.
+It is used to represent the number of characters transferred in an I/O
+operation, or the size of I/O buffers.
+\begin{footnote}
+Most places where \tcode{streamsize} is used would use \tcode{size_t} in ISO C,
+or \tcode{ssize_t} in POSIX.
+\end{footnote}
+\end{itemdescr}
+
+
 \rSec2[iostreams.limits.pos]{Positioning type limitations}
 
 \pnum
@@ -698,41 +734,6 @@
 \indexlibraryglobal{basic_ios<wchar_t>}%
 \indexlibraryglobal{fpos}%
 
-\rSec2[stream.types]{Types}
-
-\indexlibraryglobal{streamoff}%
-\begin{itemdecl}
-using streamoff = @\impdefx{type of \tcode{streamoff}}@;
-\end{itemdecl}
-
-\begin{itemdescr}
-\pnum
-The type \tcode{streamoff} is a synonym for one of the signed basic integral types of
-sufficient size to represent the maximum possible file size for the operating system.
-\begin{footnote}
-Typically \tcode{long long}.
-\end{footnote}
-\end{itemdescr}
-
-\indexlibraryglobal{streamsize}%
-\begin{itemdecl}
-using streamsize = @\impdefx{type of \tcode{streamsize}}@;
-\end{itemdecl}
-
-\begin{itemdescr}
-\pnum
-The type
-\tcode{streamsize}
-is a synonym for one of the signed basic
-integral types.
-It is used to represent the number of characters transferred in an I/O
-operation, or the size of I/O buffers.
-\begin{footnote}
-\tcode{streamsize}
-is used in most places where ISO C would use \tcode{size_t}.
-\end{footnote}
-\end{itemdescr}
-
 \rSec2[ios.base]{Class \tcode{ios_base}}
 
 \rSec3[ios.base.general]{General}