原始答案来自当没有图表时，如何列出图表？，没有给我任何坏盒警告：
\def\wheninteresting#1{%
\setbox0\vbox{#1}%
\ifdim\ht0>35pt
\unvbox0
\fi}
然而，如何动态计算空列表的高度？，它不断newsavebox给我几个坏盒子警告
\newsavebox{\boxAforwhenlistisnotempty}
\newsavebox{\boxBforwhenlistisnotempty}
\newcommand{\whenlistisnotempty}[2]{
\savebox{\boxAforwhenlistisnotempty}{%
\vbox{#2}%
}%
\savebox{\boxBforwhenlistisnotempty}{%
\vbox{\large\contentsname\\%
[+\baselineskip]\\[+\afterchapskip]\\[+\midchapskip]\\}%
}%
\typeout{The height of the list '#1'
is '\the\ht\boxAforwhenlistisnotempty'
from '\the\ht\boxBforwhenlistisnotempty'}%
\ifdim\ht\boxAforwhenlistisnotempty>\ht\boxBforwhenlistisnotempty%
\usebox{\boxAforwhenlistisnotempty}%
\fi%
}
安慰：
) (test3.toc) (test3.lof)
Underfull \hbox (badness 10000) in paragraph at lines 26--26
The height of the list 'List of Figures' is '131.77776pt' from '103.84pt'
Overfull \hbox (17.62482pt too wide) in paragraph at lines 26--27
[][]
(test3.lot)
Underfull \hbox (badness 10000) in paragraph at lines 30--30
The height of the list 'List of Tables' is '117.27776pt' from '103.84pt'
Overfull \hbox (17.62482pt too wide) in paragraph at lines 30--31
[][]
我想继续使用\newsavebox答案，因为它比使用 的答案更清晰易读\setbox0。是否可以更改使用 的答案\newsavebox以停止发出坏框警告，或者使用 的答案是否可以\setbox0变得更清晰易读？
使用坏盒的最小示例\newsavebox：
\documentclass[12pt,a4paper]{memoir}
\newsavebox{\boxAforwhenlistisnotempty}
\newsavebox{\boxBforwhenlistisnotempty}
\newcommand{\whenlistisnotempty}[2]{
\savebox{\boxAforwhenlistisnotempty}{%
\vbox{#2}%
}%
\savebox{\boxBforwhenlistisnotempty}{%
\vbox{\large\contentsname\\[+\baselineskip]\\[+\afterchapskip]}%
}%
\typeout{The height of the list '#1'
is '\the\ht\boxAforwhenlistisnotempty'
from '\the\ht\boxBforwhenlistisnotempty'}%
\ifdim\ht\boxAforwhenlistisnotempty>\ht\boxBforwhenlistisnotempty%
\usebox{\boxAforwhenlistisnotempty}%
\fi%
}
\begin{document}
\tableofcontents
\whenlistisnotempty{\listfigurename}{
\listoffigures
}
\whenlistisnotempty{\listtablename}{
\listoftables
}
\chapter{First section}
\begin{figure}
\centering
Figure
\caption{Caption}
\end{figure}
\end{document}
更新
在 @DavidCarlisle 评论之后，我尝试使用\vbox，但它不起作用并且仍然出现警告：
\newbox\boxAforwhenlistisnotempty
\newbox\boxBforwhenlistisnotempty
\newcommand{\whenlistisnotempty}[2]{%
\setbox\boxAforwhenlistisnotempty\vbox{#2}%
\setbox\boxBforwhenlistisnotempty\vbox{%
\large\contentsname\\%
[+\baselineskip]\\[+\afterchapskip]\\[+\midchapskip]\\%
}%
\typeout{The height of the list '#1'
is '\the\ht\boxAforwhenlistisnotempty'
from '\the\ht\boxBforwhenlistisnotempty'}%
\ifdim\ht\boxAforwhenlistisnotempty>\ht\boxBforwhenlistisnotempty%
\unvbox\boxAforwhenlistisnotempty%
\fi%
}
虽然现在所有警告都是Underfull不好的，而不是Overfull：
(test3.tpc)
Underfull \hbox (badness 10000) in paragraph at lines 48--48
Underfull \hbox (badness 10000) in paragraph at lines 48--48
The height of the list 'Short Table of Contents' is '137.05556pt' from '135.482
51pt'
[1{D:/User/Documents/latex/texmfs/data/pdftex/config/pdftex.map}] (test3.lof)
Underfull \hbox (badness 10000) in paragraph at lines 54--54
Underfull \hbox (badness 10000) in paragraph at lines 54--54
The height of the list 'List of Figures' is '149.05556pt' from '135.48251pt'
[2] (test3.lot)
Underfull \hbox (badness 10000) in paragraph at lines 60--60
Underfull \hbox (badness 10000) in paragraph at lines 60--60
The height of the list 'List of Tables' is '127.0pt' from '135.48251pt'
答案1
除了@DavidCarlisle 评论之外，我还设法通过替换来完全修复\\[+\afterchapskip]它们\vskip\afterchapskip
\newbox\boxAforwhenlistisnotempty
\newbox\boxBforwhenlistisnotempty
\newcommand{\whenlistisnotempty}[2]{%
\setbox\boxAforwhenlistisnotempty\vbox{#2}%
\setbox\boxBforwhenlistisnotempty\vbox{%
\large\contentsname\vskip\baselineskip\vskip\baselineskip
}%
\typeout{The height of the list '#1'
is '\the\ht\boxAforwhenlistisnotempty'
from '\the\ht\boxBforwhenlistisnotempty'}%
\ifdim\ht\boxAforwhenlistisnotempty>\ht\boxBforwhenlistisnotempty%
\unvbox\boxAforwhenlistisnotempty%
\fi%
}
安慰：
This is pdfTeX, Version 3.14159265-2.6-1.40.18 (MiKTeX 2.9.6400)
entering extended mode
(test3.tex
LaTeX2e <2017-04-15>
Babel <3.12> and hyphenation patterns for 76 language(s) loaded.
(D:\User\Documents\latex\texmfs\install\tex\latex\memoir\memoir.cls
Document Class: memoir 2016/05/16 v3.7f configurable book, report, article docu
ment class
(D:\User\Documents\latex\texmfs\install\tex\generic\oberdiek\ifpdf.sty)
(D:\User\Documents\latex\texmfs\install\tex\latex\ifetex\ifetex.sty
(D:\User\Documents\latex\texmfs\install\tex\plain\ifetex\ifetex.tex))
(D:\User\Documents\latex\texmfs\install\tex\generic\ifxetex\ifxetex.sty)
(D:\User\Documents\latex\texmfs\install\tex\generic\oberdiek\ifluatex.sty)
(D:\User\Documents\latex\texmfs\install\tex\latex\memoir\mem10.clo))
(D:\User\Documents\latex\texmfs\install\tex\latex\oberdiek\bookmark.sty
(D:\User\Documents\latex\texmfs\install\tex\generic\oberdiek\pdfescape.sty
(D:\User\Documents\latex\texmfs\install\tex\generic\oberdiek\ltxcmds.sty)
(D:\User\Documents\latex\texmfs\install\tex\generic\oberdiek\pdftexcmds.sty
(D:\User\Documents\latex\texmfs\install\tex\generic\oberdiek\infwarerr.sty)))
(D:\User\Documents\latex\texmfs\install\tex\generic\oberdiek\ifvtex.sty)
(D:\User\Documents\latex\texmfs\install\tex\latex\hyperref\hyperref.sty
(D:\User\Documents\latex\texmfs\install\tex\generic\oberdiek\hobsub-hyperref.st
y
(D:\User\Documents\latex\texmfs\install\tex\generic\oberdiek\hobsub-generic.sty
)) (D:\User\Documents\latex\texmfs\install\tex\latex\graphics\keyval.sty)
(D:\User\Documents\latex\texmfs\install\tex\latex\oberdiek\auxhook.sty)
(D:\User\Documents\latex\texmfs\install\tex\latex\oberdiek\kvoptions.sty)
(D:\User\Documents\latex\texmfs\install\tex\latex\hyperref\pd1enc.def)
(D:\User\Documents\latex\texmfs\install\tex\latex\00miktex\hyperref.cfg)
(D:\User\Documents\latex\texmfs\install\tex\latex\url\url.sty))
(D:\User\Documents\latex\texmfs\install\tex\latex\memoir\memhfixc.sty)
Package hyperref Message: Driver (autodetected): hpdftex.
(D:\User\Documents\latex\texmfs\install\tex\latex\hyperref\hpdftex.def
(D:\User\Documents\latex\texmfs\install\tex\latex\oberdiek\rerunfilecheck.sty))
(D:\User\Documents\latex\texmfs\install\tex\latex\oberdiek\bkm-pdftex.def))
(test3.aux)
(D:\User\Documents\latex\texmfs\install\tex\latex\hyperref\nameref.sty
(D:\User\Documents\latex\texmfs\install\tex\generic\oberdiek\gettitlestring.sty
))
Redoing nameref's sectioning
Redoing nameref's label
(test3.tpc)
The height of the list 'Short Table of Contents' is '151.0pt' from '34.6825pt'
[1{D:/User/Documents/latex/texmfs/data/pdftex/config/pdftex.map}] (test3.lof)
The height of the list 'List of Figures' is '149.05556pt' from '34.6825pt'
[2] (test3.lot)
The height of the list 'List of Tables' is '127.0pt' from '34.6825pt'
[3] [4] [5] (test3.aux) )<D:/User/Documents/latex/texmfs/install/fonts/type1/pu
blic/amsfonts/cm/cmbx12.pfb><D:/User/Documents/latex/texmfs/install/fonts/type1
/public/amsfonts/cm/cmr10.pfb>
Output written on test3.pdf (5 pages, 32811 bytes).
Transcript written on test3.log.
参考：