Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Boost.Phoenix makes it easier to attach semantic actions. You just inline your lambda expressions:
g[phoenix-lambda-expression]
Spirit.Karma provides some Boost.Phoenix
placeholders to access important information from the Attrib
and Context that are otherwise
fiddly to extract.
Spirit.Karma specific Phoenix placeholders
_1,
_2,
... ,
_N
Nth attribute of g
_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 generator failure.
![[Important]](../../../images/important.png) |
Important |
|---|---|
All placeholders mentioned above are defined in the namespace |
For more information see Semantic Actions.