For my slides I sometimes want to disable parts of the presentation, as example: if the operating system is Linux, I don’t need Solaris installation instructions. The \ifthenelse{<condition>}{...true...}{...false...}
from the ifthen package works very well for normal frames, but it fails if there are examples (verbatim
environment) in the code.
In such a case \iftrue
and \iffalse
are much more lazy than \ifthenelse
and compiling the examples results no longer in LaTeX parser errors. The downside of this solution: I need to predefine the condition, but in my case I have them in a separate file anyway.
The definition looks like:
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I have defined the variable \targetos
, which contains a string with the currently used platform name for my presentation. If the string matches solaris
, the boolean \usesolaris
is set to true
, else to false
. LaTeX compiles the \ifusesolaris
definition from the boolean, which I later can use to include or exclude frames:
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In addition, it is also possible to add code for the case where \usesolaris
is false. Just add \else
and the code before \fi
.