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 the documentation for a snapshot of the develop branch, built from commit c4ea36ea2a.
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Macro BOOST_VMD_IS_EMPTY_LIST_D

BOOST_VMD_IS_EMPTY_LIST_D — Tests whether a sequence is an empty Boost PP list. Re-entrant version.

Synopsis

// In header: <boost/vmd/is_empty_list.hpp>

BOOST_VMD_IS_EMPTY_LIST_D(d, sequence)

Description

An empty Boost PP list consists of the single identifier 'BOOST_PP_NIL'. This identifier also serves as a list terminator for a non-empty list.

d = The next available BOOST_PP_WHILE iteration
sequence = a preprocessor parameter

returns = 1 if the sequence is an empty Boost PP list, 0 if it is not.

The macro will generate a preprocessing error if the input as an empty list marker, instead of being an identifier, is a preprocessor token which VMD cannot parse, as in the example '&BOOST_PP_NIL'.


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