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

Macro BOOST_VMD_ASSERT_IS_LIST_D

BOOST_VMD_ASSERT_IS_LIST_D — Asserts that the sequence is a Boost PP list. Re-entrant version.

Synopsis

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

BOOST_VMD_ASSERT_IS_LIST_D(d, sequence)

Description

The macro checks that the sequence is a Boost PP list. If it is not a Boost PP list, it forces a compiler error.

The macro normally checks for a Boost PP list only in debug mode. However an end-user can force the macro to check or not check by defining the macro BOOST_VMD_ASSERT_DATA to 1 or 0 respectively.

d = The next available BOOST_PP_WHILE iteration.
sequence = a possible Boost PP list.

returns  = Normally the macro returns nothing. 

           If the sequence is a Boost PP list, nothing is 
           output.
          
           For VC++, because there is no sure way of forcing  
           a compiler error from within a macro without producing
           output, if the sequence is not a Boost PP list the 
           macro forces a compiler error by outputting invalid C++.
          
           For all other compilers a compiler error is forced 
           without producing output if the parameter is not a 
           Boost PP list.