...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
BOOST_VARIANT_ENUM_PARAMS — Enumerate parameters for use with
variant
.
BOOST_VARIANT_ENUM_PARAMS(param)
Expands to a comma-separated sequence of length
BOOST_VARIANT_LIMIT_TYPES
, where
each element in the sequence consists of the concatenation of
param with its zero-based index into the
sequence. That is,
param ## 0, param ## 1, ..., param ## BOOST_VARIANT_LIMIT_TYPES - 1
.
Rationale: This macro greatly
simplifies for the user the process of declaring
variant
types
in function templates or explicit partial specializations of class
templates, as shown in the
tutorial.