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Boost.Phoenix makes it easier to attach semantic actions. You just inline your lambda expressions:
p[phoenix-lambda-expression]
Spirit.Qi provides some Boost.Phoenix
placeholders to important information from the Attrib
and Context that are otherwise
fiddly to extract.
Spirit.Qi specific Phoenix placeholders
_1, _2... , _N
Nth attribute of p
_valThe enclosing rule's synthesized attribute.
_r1, _r2... , _rNThe enclosing rule's Nth inherited attribute.
_a, _b... , _j
The enclosing rule's local variables (_a
refers to the first).
_pass
Assign false to _pass to force a parser failure.
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Important |
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All placeholders mentioned above are defined in the namespace |
For more detailed information about semantic actions see: here.