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Answer by egreg for What is exactly a hook in etoolbox
The definition of \appto is% etoolbox.sty, line 891:\newrobustcmd{\appto}[2]{% \ifundef{#1} {\edef#1{\unexpanded{#2}}} {\edef#1{\expandonce#1\unexpanded{#2}}}}The first argument should be a...
View ArticleWhat is exactly a hook in etoolbox
I understand well the \apptocmd and related tools of etoolbox package. However, I still not understand what \appto<hook>{<code>} and related do, even reading three time the handbook ?...
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