% \iffalse meta-comment
%
%<*driver>
\DocumentMetadata{tagging=on,pdfstandard=UA-2}
\documentclass{l3in2edoc}

\usepackage{xcolor}
%work around tocloft's failure to patch \@starttoc, will be fixed there soon
\makeatletter\def\@cft@fail{}\makeatother
\usepackage{tocloft}
\setcounter{tocdepth}{1}
\def\tocwidthA{0.55}
\def\tocwidthB{0.44}
\def\cftpartfont{\scshape}
\def\cftsecfont{\small}
\cftbeforesecskip=0pt
\def\cftpartleader{}
\def\cftpartafterpnum{\cftparfillskip}
\def\cftsecleader{}
\def\cftsecafterpnum{\cftparfillskip}
%
\DeclareRobustCommand\pkg{\textsf}
\def\pkgopt#1{\texttt{[#1]}}
\newcommand\chng[1]{\marginpar{\footnotesize\raggedright\textsf{#1}}}

% copied from ltxdoc
\providecommand\marg[1]{%
  {\ttfamily\char`\{}\meta{#1}{\ttfamily\char`\}}}
\providecommand\oarg[1]{%
  {\ttfamily[}\meta{#1}{\ttfamily]}}
\providecommand\parg[1]{%
  {\ttfamily(}\meta{#1}{\ttfamily)}}
\makeatletter  
\def\cmd#1{\texttt{\char`\\\expandafter\cmd@to@cs\string#1}}
\def\cmd@to@cs#1#2{\char\number`#2\relax}
\makeatother 


\def\PDF{\textsc{pdf}}
\def\PS{\textsc{ps}}
\def\DVI{\textsc{dvi}}
\def\EPS{\textsc{eps}}

\usepackage{amsmath,multicol}

\def\chngpagev{v1.2b}  

\usepackage{changepage}
\usepackage{microtype}
\usepackage{fontspec}
\setmainfont{texgyrepagella}
\usepackage{lua-unicode-math}
\linespread{1.1}
\frenchspacing
\MakeShortVerb|
\GetFileInfo{changepage.sty}

\begin{document}
   \DocInput{changepage.dtx}%
\end{document}
%</driver>
% \fi
%  
%\makeatletter
%\def\@doc@describe#1#2{^^A
%    \ifdoc@noprint\else
%      \marginpar{\raggedleft
%                 \strut
%                  \label{doc/function//\expandafter\@gobble\string#2}^^A
%                  \doc@providetarget
%                 \@nameuse{PrintDescribe#1}{#2}}^^A
%    \fi
%    \ifdoc@noindex\else
%      \@nameuse{Special#1Index}{#2}^^A
%    \fi
%  \@esphack
%  \endgroup
%  \ignorespaces}
%\makeatother
%
%  \title{The \pkg{changepage} and \pkg{chngpage} packages}
%  \author{%
%   Author: Peter Wilson, Herries Press\\
%   Maintainer: \LaTeX{} Project\\
%   \url{https://github.com/LaTeX-Package-Repositories/herries-press/}%
%  }
%  \date{\fileversion, \filedate\ and \chngpagev}
%  
%  \maketitle
%  
%  \begin{abstract}
%  \noindent Provides command
%  |\ifoddpage| to detect the current page `side',
%  environment |adjustwidth| to locally change the margins of the text,
%  and commands |\changetext| and |\changepage| for more
%  radical changes to the page design mid-way through a document.
%  
%  \pkg{changepage} is the new version of \pkg{chngpage} to be
%  compatible with \pkg{memoir}. \pkg{chngpage} is now deprecated
%  for this reason.
%  \end{abstract}
%
%  \tableofcontents
%  \addtocontents{toc}{\protect\begin{multicols}{2}}
%  \part{User documentation}
%  
%  Load the package like this:
%  \begin{verbatim}
%  \usepackage[strict]{changepage}
%  \end{verbatim}
%  Or for deprecated uses:
%  \begin{verbatim}
%  \usepackage[strict]{chngpage}
%  \end{verbatim}
%  
%  \clearpage
%  \section{Detecting odd or even pages}
%  
%  \DescribeMacro{\checkoddpage}
%  \DescribeMacro{\ifoddpage}
%  The |\checkoddpage| command can be used anywhere in the body of
%  a document to determine if \TeX\ is typesetting on an odd or
%  even numbered page. If on an odd page then |\ifoddpage| is
%  set \meta{true}, otherwise (on an even page) |\ifoddpage| is set
%  \meta{false}.
%  
%  \chng{Use \cs{ifcpoddpage} instead if you're using chngpage.}
%  
%  Strict page checking works by the |\checkoddpage| command generating
%  a label and then checking the |\pageref| for the label (actually, a special
%  version of |\pageref| is required and is used internally by |\checkoddpage|).
%  This mechanism requires at least two \LaTeX\ passes to ensure that
%  the labels have settled (on the initial pass there will be no labels
%  in the *.aux file to be checked).
%  
%  The label identifier is composed of the command |\cplabel|
%  and an automatically generated number. |\cplabel|, initially
%  defined as `|^_|', can be changed in the preamble if it will cause
%  a clash with any author-defined labels. The default labels will
%  be of the form `|^_|\meta{N}' where \meta{N} is a positive integer.
%  
%  \chng{For chngpage, use \cs{cplabelprefix} instead of \cs{cplabel}.}
%  
%  \DescribeMacro{\strictpagecheck}
%  \DescribeMacro{\easypagecheck}
%  The package option `strict' turns on strict page checking --- the default
%  is not to use strict checking. Strict page checking can be turned on or
%  off at any time by the commands |\strictpagecheck| or |\easypagecheck|.
%  The easy page check just tests the page number to see if it is odd or even,
%  which often does not give the correct result because of \TeX's asynchronous
%  output mechanism.
%  
%  If you use |\checkoddpage| between two paragraphs of text it is possible even
%  in strict mode that the label gets `attached' to the preceding paragraph.
%  In some cases you can fix this by writing |\leavevmode\checkoddpage| so that the label
%  is only created after the start of the next paragraph, but if you are inserting
%  something like a section heading this approach will also insert an empty, unwanted,
%  paragraph. Therefore use some care when choosing where and how this command is used
%  in your document.
%  
%  
%  \section{Adjusting the margins}
%  
%  \DescribeEnv{adjustwidth}
%  Within an |adjustwidth| environment the left and right margins can be
%  adjusted. The environment takes two required length arguments:
%  \begin{quote}
%  \cs{begin}|{adjustwidth}|\marg{leftmargin}\marg{rightmargin}
%  \end{quote}
%  A positive length value will increase the relevant margin (shortening
%  the text lines) while a negative length value will decrease the margin
%  (lengthening text lines). An empty length argument means no change
%  to the margin. At the end of the environment the margins revert to
%  their original values.
%  
%  For example, to extend the text into the right margin:
%  \begin{quote}
%  |\begin{adjustwidth}{}{-8em}|
%  \end{quote}
%  The starred version, |adjustwidth*|, causes the values of the
%  margins to switch between odd and even pages, or more precisely: 
%  they switch depending on if the environment \emph{starts} on an odd
%  or even page. They do not switch if there is a page break inside 
%  the environment. 
%  
%  \chng{For chngpage use \cs{begin}\texttt{\{adjustwidth\}[]}
%  instead of \cs{begin}\texttt{\{adjustwidth*\}}.}
%  
%  For example, if the document is being set two-sided it might be
%  advantageous to have any wider text extending into the outside
%  margin:
%  \begin{quote}
%  |\begin{adjustwidth*}{}{-8em}|
%  \end{quote}
%  To have the adjusted text horizontally centered with respect to
%  any surrounding text, the margins should be adjusted equally:
%  \begin{quote}
%  |\begin{adjustwidth}{-4em}{-4em}|
%  \end{quote}
%  For interest, \cs{begin}|{quotation}| is pretty much equivalent to
%  \begin{quote}
%  |\begin{adjustwidth}{2.5em}{2.5em}|
%  \end{quote}
%  The environment may also be used inside a float if the contents are
%  a bit too wide for the text block, but can still fit within the physical
%  page:
%  \begin{verbatim}
%  \begin{figure}
%    \begin{adjustwidth}{-2em}{-2em}
%       \includegraphics{wide}
%       \caption{Wide figure}
%    \end{adjustwidth}
%  \end{figure}
%  \end{verbatim}
%  Sometimes, because of the asynchronous nature of the TeX output
%  routine, the margin switching may be incorrect (like |\marginpar| sometimes)
%  near the top of a page. This can be corrected by using the package
%  option `strict' (i.e., |\usepackage[strict]{chngpage}|), which causes
%  adjustwidth to use the |\checkoddpage| command (see below).
%  
%  The strict option uses a label that is issued at the begin of environment. If 
%  the environment begin just at a page break the label can be issued at the wrong place
%  and the check is wrong (this should work better if \cs{DocumentMetadata} is used,
%  see below section \ref{sec:tagging} about tagging support. 
%  
%  A disadvantage of the strict option is that the package generates
%  a new label for each adjustwidth environment, and \TeX\ may run out
%  of space if there are an excessive number of labels in the document
%  (but nowadays this shouldn't be a problem anymore).
%  
%  Whether or not the strict option is used, `strict adjustwidths'
%  can be turned on by putting the command |\strictpagecheck| before
%  the environment, and turned off by using |\easypagecheck|.
%  
%  \chng{In chngpage, use \cs{cpstricttrue} and \cs{cpstrictfalse}
%  instead of \cs{strictpagecheck} and \cs{easypagecheck}.}
%  
%  \textsc{note:}
%  In a twocolumn document, the |adjustwidth| environment
%  treats both columns equally. For example, if the width is meant
%  to be wider at the outer margin, then on odd pages the extra width
%  will be at the right of any column, and on even pages the extra
%  will be at the left of any column. You can get interesting effects
%  by careful hand tuning on two column pages.
%  
%  \section{Tagging support}
%  
%  The original |adjustwidth| environment is implemented as a list. 
%  If \cs{DocumentMetadata}
%  is used, a |displayblock| environment is used together with the tagging recipe |noop|.
%  This means that the environment does not produce additional
%  structures. 
%  
%  The new implementation also changes \emph{intentionally} the appearance in some cases: 
%  The original |adjustwidth| environment does not indent its first paragraph 
%  (which is in my opinion a bug), the new one does it (naturally only if 
%  \cs{parindent} has a positive value). 
%  The new implementation also uses for |adjustwidth*| a slightly different check
%  for odd pages if the option |strict| is in effect, this should improve the 
%  behaviour at page breaks. 
%  
%  \section{Changing the text block}
%  
%  \DescribeMacro{\changetext}
%  The |\changetext| command is for changing the size and horizontal position
%  of the text block on a page. The command takes 5 arguments, each of which
%  is a length or is empty. i.e.,
%  \begin{quote}
%  \cmd\changetext\marg{text height}\marg{text width}\marg{even-side margin}
%  \newline\null\hfill\marg{odd-side margin}\marg{column sep.}
%  \end{quote}
%  The given lengths are added to the corresponding current lengths and
%  the remainder of the current page is typeset using the changed text block
%  layout. The new layout remains in effect until another |\change...| command
%  is issued.
%  
%  
%  \section{Changing the entire page design}
%  
%  \DescribeMacro{\changepage}
%  The |\changepage| command is for changing the general layout of
%  a page. The command takes 9 arguments, each of which is a length or is empty.
%  The first 5 arguments are the same as for |\changetext| and have the same effect.
%  The last four arguments are:
%  \begin{quote}
%  \cmd\changepage\meta{5 args}\marg{topmargin}\marg{headheight}\marg{headsep}\marg{footskip}
%  \end{quote}
%  These lengths are added to the corresponding current lengths and
%  thus modify the vertical positions of the elements of the page. The
%  remainder of the current page is typeset using the changed text block
%  and page layout. The new layout remains in effect until another
%  |\change...| command is issued.
%  
%  \begin{itemize}
%  \item[\textsc{note} 1] Not supplying a value for a length argument is equivalent
%           to giving it a zero length value.
%  
%  \item[\textsc{note} 2] For any given page, everything is constant except for the textwidth
%           and columnsep (for example, what is the meaning of two
%           topmargins on a single column page?).
%           It is therefore best to change anything else at the
%           start of a new page. Further, any changes only apply to whole
%           paragraphs. If you want an odd shaped paragraph use either
%           the \pkg{hanging} package or the \TeX\ |\parshape| command.
%  \end{itemize}
%  For example, to change from single column pages to double column
%  pages where the text block is both shorter and wider, then to revert
%  back to the initial layout:
%  \begin{verbatim}
%  ... single column normal page
%  \newpage % or \clearpage
%  \changetext{-5\baselineskip}{10em}{-5em}{-5em}{}
%  \twocolumn
%  ... two column pages
%  \clearpage
%  \changetext{5\baselineskip}{-10em}{5em}{5em}{}
%  \onecolumn
%  ... normal pages
%  \end{verbatim}
%  Note the adjustments to the margins which will keep the vertical centerline
%  of the textblock at the same position on the page.
%  
%  As another example, to increase the width of a single paragraph:
%  \begin{verbatim}
%  \changetext{0pt}{5em}{}{}{}%
%  Start of wider paragraph text ...
%  ... end of paragraph.
%  
%  \changetext{0pt}{-5em}{}{}{}
%  Start of a normal paragraph ...
%  \end{verbatim}
%  Under some circumstances you can include a |\change...| command as part of
%  the argument to |\afterpage| (from the \pkg{afterpage} package) and it may work.
%  Similarly it may work in a heading style used for |\thispagestyle| to change
%  a single page.
%  
%  \clearpage
%  \parindent=0pt
%  
%  \part{Implementation}
%  \section{The \pkg{changepage} package}
%    \begin{macrocode}
%<*package>
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{changepage}[2026-09-15 v2.0b check page and change page layout]

%    \end{macrocode}
% Don't use this with memoir
% \begin{macro}[no-user-doc]{\cp@whoopsusingmemoir}
%    \begin{macrocode} 
\newcommand*{\cp@whoopsusingmemoir}{}
\@ifclassloaded{memoir}{\def\cp@whoopsusingmemoir{\endinput}}
\cp@whoopsusingmemoir
%    \end{macrocode}
% \end{macro}
% New \verb|\if| for the strict option
%    \begin{macrocode}
\newif\ifstrictpagecheck
  \strictpagecheckfalse
%    \end{macrocode}
% \begin{macro}{\strictpagecheck,\easypagecheck}
% User commands for switching strict page checking on/off
%    \begin{macrocode}
\newcommand*{\strictpagecheck}{\strictpagechecktrue}
\newcommand*{\easypagecheck}{\strictpagecheckfalse}
%    \end{macrocode}
% \end{macro}
% Declare and process options
%    \begin{macrocode}
\DeclareOption{strict}{\strictpagechecktrue}
\ProcessOptions\relax
%    \end{macrocode}
% \subsection{Strict checking of odd/even page.}
% Works by writing a label and then checking its pageref.
% \begin{macro}{\ifoddpage}
%    \begin{macrocode}
\newif\ifoddpage
%    \end{macrocode}
% \end{macro}
%    \begin{macrocode}
\newcounter{cp@cntr}
\newcount\cp@tempcnt % instead of  \verb|\@memcnta|
\newcommand{\cplabel}{^_}

\gdef\thepmemc@@page{\the\c@page}

\long\def\pmemprotected@write#1#2#3{% modified  \verb|\protected@write|
  \begingroup
  \let\thepmemc@@page\relax
  #2%
  \let\protect\@unexpandable@protect
  \edef\reserved@a{\write#1{#3}}%
  \reserved@a
  \endgroup
  \if@nobreak\ifvmode\nobreak\fi\fi}

\newcommand*{\pmemlabel}[1]{\@bsphack
  \pmemprotected@write\@auxout{}%
    {\string\newpmemlabel{#1}{\thepmemc@@page}}%
  \@esphack}

\newcommand*{\newpmemlabel}[2]{{\global\@namedef{m@#1}{#2}}}
\newcommand*{\pmemlabelref}[1]{%
  \expandafter\ifx\csname m@#1\endcsname\relax
    0%   % 0 if there is no label yet in the aux file
  \else
    \csname m@#1\endcsname
  \fi}
%    \end{macrocode}
%
% \begin{macro}{\checkoddpage}
%    \begin{macrocode}
\DeclareRobustCommand{\checkoddpage}{%
  \oddpagefalse%
  \ifstrictpagecheck%
    \stepcounter{cp@cntr}\pmemlabel{\cplabel\thecp@cntr}%
    \cp@tempcnt=\pmemlabelref{\cplabel\thecp@cntr}\relax
    \ifodd\cp@tempcnt\oddpagetrue\fi
  \else
    \ifodd\c@page\oddpagetrue\fi
  \fi}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\cp@checkoddpage@nextpar}
% A variant that delays the label until the next par.
% \changes{2.0a}{2026-09-14}{Variant of check that delays to the next par}
%    \begin{macrocode}
\DeclareRobustCommand{\cp@checkoddpage@nextpar}{%
  \oddpagefalse%
  \ifstrictpagecheck%
    \stepcounter{cp@cntr}%
    \AddToHookNext{para/begin}{\pmemlabel{\cplabel\thecp@cntr}}%
    \cp@tempcnt=\pmemlabelref{\cplabel\thecp@cntr}\relax
    \ifodd\cp@tempcnt\oddpagetrue\fi
  \else
    \ifodd\c@page\oddpagetrue\fi
  \fi}  
%    \end{macrocode}
% \end{macro}
% End newcommands for strict checking of odd/even page.
% 
% \subsection{Layout changes}
% 
% Copy of some of the code from the ifmtarg package to save requiring ifmtarg:
%    \begin{macrocode}
\begingroup
\catcode`\Q=3
\long\gdef\@ifmtarg#1{\@xifmtarg#1QQ\@secondoftwo\@firstoftwo\@nil}
\long\gdef\@xifmtarg#1#2Q#3#4#5\@nil{#4}
\endgroup
%    \end{macrocode}
% Set the page output parameters
%    \begin{macrocode}
\DeclareRobustCommand{\ch@ngetext}{%
  \setlength{\@colht}{\textheight}\setlength{\@colroom}{\textheight}%
  \setlength{\vsize}{\textheight}\setlength{\columnwidth}{\textwidth}%
  \if@twocolumn%
    \advance\columnwidth-\columnsep \divide\columnwidth\tw@%
    \@firstcolumntrue%
  \fi%
  \setlength{\hsize}{\columnwidth}%
  \setlength{\linewidth}{\hsize}}
%    \end{macrocode}

% \begin{macro}{\changetext}
%    \begin{macrocode}
\DeclareRobustCommand{\changetext}[5]{%
  \@ifmtarg{#1}{}{\addtolength{\textheight}{#1}}%
  \@ifmtarg{#2}{}{\addtolength{\textwidth}{#2}}%
  \@ifmtarg{#3}{}{\addtolength{\evensidemargin}{#3}}%
  \@ifmtarg{#4}{}{\addtolength{\oddsidemargin}{#4}}%
  \@ifmtarg{#5}{}{\addtolength{\columnsep}{#5}}%
  \ch@ngetext}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\changepage}
%    \begin{macrocode}
\DeclareRobustCommand{\changepage}[9]{%
  \@ifmtarg{#1}{}{\addtolength{\textheight}{#1}}%
  \@ifmtarg{#2}{}{\addtolength{\textwidth}{#2}}%
  \@ifmtarg{#3}{}{\addtolength{\evensidemargin}{#3}}%
  \@ifmtarg{#4}{}{\addtolength{\oddsidemargin}{#4}}%
  \@ifmtarg{#5}{}{\addtolength{\columnsep}{#5}}%
  \ch@ngetext%
  \@ifmtarg{#6}{}{\addtolength{\topmargin}{#6}}%
  \@ifmtarg{#7}{}{\addtolength{\headheight}{#7}}%
  \@ifmtarg{#8}{}{\addtolength{\headsep}{#8}}%
  \@ifmtarg{#9}{}{\addtolength{\footskip}{#9}}}
%    \end{macrocode}
% \end{macro}
% \begin{environment}{adjustwidth,adjustwidth*}
%    \begin{macrocode}
\newenvironment{adjustwidth}[2]{%
  \begin{list}{}{%
    \topsep\z@%
    \listparindent\parindent%
    \parsep\parskip%
    \@ifmtarg{#1}{\setlength{\leftmargin}{\z@}}%
                 {\setlength{\leftmargin}{#1}}%
    \@ifmtarg{#2}{\setlength{\rightmargin}{\z@}}%
                 {\setlength{\rightmargin}{#2}}%
    }
    \item[]}{\end{list}}

\newenvironment{adjustwidth*}[2]{%
  \begin{list}{}{%
    \topsep\z@%
    \listparindent\parindent%
    \parsep\parskip%
    \checkoddpage
    \ifoddpage%     odd numbered page
      \@ifmtarg{#1}{\setlength{\leftmargin}{\z@}}%
                   {\setlength{\leftmargin}{#1}}%
      \@ifmtarg{#2}{\setlength{\rightmargin}{\z@}}%
                   {\setlength{\rightmargin}{#2}}%
    \else%          even numbered page
      \@ifmtarg{#2}{\setlength{\leftmargin}{\z@}}%
                   {\setlength{\leftmargin}{#2}}%
      \@ifmtarg{#1}{\setlength{\rightmargin}{\z@}}%
                   {\setlength{\rightmargin}{#1}}%
    \fi}
    \item[]}{\end{list}}
    
\IfFormatAtLeastTF{2026-06-01}
 {
   \IfDocumentMetadataT
    {
      \RenewDocumentEnvironment{adjustwidth}{mm}
       {%
         \par 
         \begin{displayblock}%
          [tagging-recipe=noop,
           left-margin ={#1+0pt},
           right-margin={#2+0pt},
           para-indent=\parindent,
           begin-vspace=0pt,
           end-vspace=0pt,
           begin-extra-vspace=0pt,
           end-extra-vspace=0pt]
       }
       {\end{displayblock}\par}
       \RenewDocumentEnvironment{adjustwidth*}{mm}
        {%
         \par\cp@checkoddpage@nextpar
         \begin{displayblock}%
          [tagging-recipe=noop,
           left-margin= \ifoddpage #1+0pt \else #2+0pt\fi,
           right-margin=\ifoddpage #2+0pt \else #1+0pt\fi,
           para-indent=\parindent,
           begin-vspace=0pt,
           end-vspace=0pt,
           begin-extra-vspace=0pt,
           end-extra-vspace=0pt]
        }
        {\end{displayblock}\par}
    }
 } 
%</package>
%    \end{macrocode}
% \end{environment}
%  
%  \clearpage
%  \section{The \pkg{chngpage} package}
%    \begin{macrocode}
%<*chngpage>
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% PLEASE NOTE:
%% THIS PACKAGE IS DEPRECATED IN FAVOUR OF CHANGEPAGE.STY FOR REASONS
%% OF COMPATIBILITY WITH THE MEMOIR CLASS. The two are equivalent;
%% please do not use this one for new documents or packages.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{chngpage}[2009/10/20 v1.2b change page layout]

%% Note: internal package commands all include the string |cp@|.
%% New \cs{if} for the strict option.
\newif\ifcpstrict
  \cpstrictfalse

%% Declare and process options.
\DeclareOption{strict}{\cpstricttrue}
\ProcessOptions\relax

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% New commands for strict checking of odd/even page.
% Works by writing a label and then checking its pageref.
%
% Rewritten in v1.2 to handle roman, Roman, etc page numbers
% as well as arabic; also eliminates special code to handle
% hyperref. Based on the code in the memoir class.

\newif\ifcpoddpage
\newcounter{cp@cnt}
\newcounter{cp@tempcnt}
\newcommand{\cplabelprefix}{^_}

\gdef\thecp@page{\the\c@page}
\long\def\cp@protected@write#1#2#3{%  % modified \cs{protected@write}
  \begingroup
  \let\thecp@page\relax
  #2%
  \let\protect\@unexpandable@protect
  \edef\reserved@a{\write#1{#3}}%
  \reserved@a
  \endgroup
  \if@nobreak\ifvmode\nobreak\fi\fi}

\DeclareRobustCommand{\checkoddpage}{%
  \cpoddpagefalse
  \stepcounter{cp@cnt}\cplabel{\cplabelprefix\thecp@cnt}%
  \c@cp@tempcnt=\cp@labelref{\cplabelprefix\thecp@cnt}\relax
  \ifodd\c@cp@tempcnt\cpoddpagetrue\fi}

\newcommand{\cplabel}[1]{\@bsphack
  \cp@protected@write\@auxout{}%
    {\string\newcplabel{#1}{\thecp@page}}%
  \@esphack}

\newcommand{\newcplabel}[2]{{\global\@namedef{p@#1}{#2}}}

\newcommand{\cp@labelref}[1]{%
  \expandafter\ifx\csname p@#1\endcsname\relax
    0%  % 0 if there is no label yet in aux file
  \else
    \csname p@#1\endcsname
  \fi}

% End newcommands for strict checking of odd/even page.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% Copy of some of the code from the ifmtarg package to save requiring ifmtarg.
\begingroup
\catcode`\Q=3
\long\gdef\@ifmtarg#1{\@xifmtarg#1QQ\@secondoftwo\@firstoftwo\@nil}
\long\gdef\@xifmtarg#1#2Q#3#4#5\@nil{#4}
\endgroup

% Set the page output parameters.
\DeclareRobustCommand{\ch@ngetext}{%
  \setlength{\@colht}{\textheight}\setlength{\@colroom}{\textheight}%
  \setlength{\vsize}{\textheight}\setlength{\columnwidth}{\textwidth}%
  \if@twocolumn%
    \advance\columnwidth-\columnsep \divide\columnwidth\tw@%
    \@firstcolumntrue%
  \fi%
  \setlength{\hsize}{\columnwidth}%
  \setlength{\linewidth}{\hsize}%
}

\DeclareRobustCommand{\changetext}[5]{%
  \@ifmtarg{#1}{}{\addtolength{\textheight}{#1}}%
  \@ifmtarg{#2}{}{\addtolength{\textwidth}{#2}}%
  \@ifmtarg{#3}{}{\addtolength{\evensidemargin}{#3}}%
  \@ifmtarg{#4}{}{\addtolength{\oddsidemargin}{#4}}%
  \@ifmtarg{#5}{}{\addtolength{\columnsep}{#5}}%
  \ch@ngetext%
}

\DeclareRobustCommand{\changepage}[9]{%
  \@ifmtarg{#1}{}{\addtolength{\textheight}{#1}}%
  \@ifmtarg{#2}{}{\addtolength{\textwidth}{#2}}%
  \@ifmtarg{#3}{}{\addtolength{\evensidemargin}{#3}}%
  \@ifmtarg{#4}{}{\addtolength{\oddsidemargin}{#4}}%
  \@ifmtarg{#5}{}{\addtolength{\columnsep}{#5}}%
  \ch@ngetext%
  \@ifmtarg{#6}{}{\addtolength{\topmargin}{#6}}%
  \@ifmtarg{#7}{}{\addtolength{\headheight}{#7}}%
  \@ifmtarg{#8}{}{\addtolength{\headsep}{#8}}%
  \@ifmtarg{#9}{}{\addtolength{\footskip}{#9}}%
}


\newenvironment{adjustwidth}[3][\@empty]{%
  \begin{list}{}{%
    \topsep\z@%
    \listparindent\parindent%
    \parsep\parskip%
    \@ifmtarg{#2}{\setlength{\leftmargin}{\z@}}{\setlength{\leftmargin}{#2}}%
    \@ifmtarg{#3}{\setlength{\rightmargin}{\z@}}{\setlength{\rightmargin}{#3}}%
    \ifx\@empty #1\relax \else
      \cpoddpagefalse
      \ifcpstrict\checkoddpage\else
        \ifodd\c@page\cpoddpagetrue\fi
      \fi
      \ifcpoddpage\else  % even numbered page
        \@ifmtarg{#3}{\setlength{\leftmargin}{\z@}}{\setlength{\leftmargin}{#3}}%
        \@ifmtarg{#2}{\setlength{\rightmargin}{\z@}}{\setlength{\rightmargin}{#2}}%
      \fi
    \fi}
    \item[]}{\end{list}}
%</chngpage>
%    \end{macrocode}
%  \addtocontents{toc}{\protect\end{multicols}}