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In GLR grammars, $N and @N now yield non-modifiable lvalues.

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Paul Eggert
2003-10-05 06:46:53 +00:00
parent 66ef8b9d65
commit 0cc3da3a4e
3 changed files with 14 additions and 5 deletions
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doc/bison.texinfo
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@@ -2797,9 +2797,10 @@ Actions, ,Actions in Mid-Rule}).
The C code in an action can refer to the semantic values of the components
matched by the rule with the construct @code{$@var{n}}, which stands for
the value of the @var{n}th component. The semantic value for the grouping
being constructed is @code{$$}. (Bison translates both of these constructs
into array element references when it copies the actions into the parser
file.)
being constructed is @code{$$}. Bison translates both of these
constructs into expressions of the appropriate type when it copies the
actions into the parser file. @code{$$} is translated to a modifiable
lvalue, so it can be assigned to.
Here is a typical example: