Is it safe to redefine \@starttoc?

Needs at least two LaTeX runs.

\documentclass{scrbook}
\usepackage{multicol}
\AfterTOCHead[toc]{\begin{multicols}{2}}
\AtEndDocument{\addtocontents{toc}{\protect\end{multicols}}}
\begin{document}
\tableofcontents

\part{part}
[...]

enter image description here

Or for the star version of multicols (no balanced columns)

\AfterTOCHead[toc]{\raggedcolumns\begin{multicols}{2}}

Each of the KOMA-Script classes scrartcl, scrreprt and scrbook load and use package tocbasic for the ToC and the Lists. tocbasic uses \tocbasic@starttoc based on \@starttoc. \tocbasic@starttoc and \@starttoc both are internal commands and should not be redefined by users. But tocbasic provides two hooks to execute code before (\BeforeStartingTOC) and after (\AfterStartingTOC) @starttoc.

Note that \BeforeStartingTOC and \AfterStartingTOC are at the same group level (inside the same group), so you can use:

\BeforeStartingTOC[toc]{\begin{multicols}{2}}
\AfterStartingTOC[toc]{\end{multicols}}

enter image description here

Code:

\documentclass{scrbook}
\usepackage{multicol}

\BeforeStartingTOC[toc]{\begin{multicols}{2}}
\AfterStartingTOC[toc]{\end{multicols}}

\begin{document}
\tableofcontents

\part{part}
\chapter{chapter}
\section{section}
\section{section}
\chapter{chapter}
\section{section}
\section{section}
\chapter{chapter}
\section{section}
\section{section}
\chapter{chapter}
\section{section}
\section{section}
\chapter{chapter}
\section{section}
\section{section}
\part{part}
\chapter{chapter}
\section{section}
\section{section}
\chapter{chapter}
\section{section}
\section{section}
\chapter{chapter}
\section{section}
\section{section}
\chapter{chapter}
\section{section}
\section{section}
\chapter{chapter}
\section{section}
\section{section}
\end{document}

Or with the starred version of multicols:

\BeforeStartingTOC[toc]{\begin{multicols*}{2}}
\AfterStartingTOC[toc]{\end{multicols*}}

enter image description here

Tags:

Table Of Contents

Multicol

Tocloft

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