Nota : this packages requires pdfTeX.
The linegoal package provides a macro \linegoal
to be used with \setlength :
\setlength<some dimen>\linegoal
will assign to <some dimen> the horizontal length
of the remainder of the line.
This is achieved using the \pdfsavepos primitive
and the zref-savepos package.
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Typical usage :
Some text: \begin{tabularx}\linegoal{|l|X|} \hline
one & two \\
three & four \\\hline
\end{tabularx}
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