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
This is an older version of Boost and was released in 2022. The current version is 1.89.0.
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.