FM / vmd

/usr/include/boost/vmd

Name	Size	Mode	Actions
array/	-	0755	rm
detail/	-	0755	rm
list/	-	0755	rm
seq/	-	0755	rm
tuple/	-	0755	rm
array.hpp	501	0644	edit dl rm
assert.hpp	1933	0644	edit dl rm
assert_is_array.hpp	3542	0644	edit dl rm
assert_is_empty.hpp	2758	0644	edit dl rm
assert_is_identifier.hpp	5426	0644	edit dl rm
assert_is_list.hpp	3501	0644	edit dl rm
assert_is_number.hpp	2000	0644	edit dl rm
assert_is_seq.hpp	3463	0644	edit dl rm
assert_is_tuple.hpp	2046	0644	edit dl rm
assert_is_type.hpp	3400	0644	edit dl rm
elem.hpp	16747	0644	edit dl rm
empty.hpp	982	0644	edit dl rm
enum.hpp	4803	0644	edit dl rm
equal.hpp	3373	0644	edit dl rm
get_type.hpp	4299	0644	edit dl rm
identity.hpp	2629	0644	edit dl rm
is_array.hpp	2050	0644	edit dl rm
is_empty.hpp	3468	0644	edit dl rm
is_empty_array.hpp	2879	0644	edit dl rm
is_empty_list.hpp	2172	0644	edit dl rm
is_identifier.hpp	4286	0644	edit dl rm
is_list.hpp	2083	0644	edit dl rm
is_multi.hpp	2087	0644	edit dl rm
is_number.hpp	1421	0644	edit dl rm
is_parens_empty.hpp	1866	0644	edit dl rm
is_seq.hpp	1897	0644	edit dl rm
is_tuple.hpp	1093	0644	edit dl rm
is_type.hpp	2093	0644	edit dl rm
is_unary.hpp	2111	0644	edit dl rm
list.hpp	496	0644	edit dl rm
not_equal.hpp	3571	0644	edit dl rm
seq.hpp	796	0644	edit dl rm
size.hpp	1323	0644	edit dl rm
to_array.hpp	4735	0644	edit dl rm
to_list.hpp	4721	0644	edit dl rm
to_seq.hpp	4762	0644	edit dl rm
to_tuple.hpp	4802	0644	edit dl rm
tuple.hpp	822	0644	edit dl rm
vmd.hpp	1791	0644	edit dl rm

Edit: /usr/include/boost/vmd/is_empty.hpp (3468B)

//  (C) Copyright Edward Diener 2011-2015,2019
//  Use, modification and distribution are subject to the Boost Software License,
//  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
//  http://www.boost.org/LICENSE_1_0.txt).

#if !defined(BOOST_VMD_IS_EMPTY_HPP)
#define BOOST_VMD_IS_EMPTY_HPP

#include <boost/vmd/detail/setup.hpp>

#if BOOST_PP_VARIADICS

#include <boost/preprocessor/punctuation/is_begin_parens.hpp>
#include <boost/vmd/detail/is_empty.hpp>

The succeeding comments in this file are in doxygen format.

/** \file
*/

/** \def BOOST_VMD_IS_EMPTY(...)

\brief Tests whether its input is empty or not.

The macro checks to see if the input is empty or not.
    It returns 1 if the input is empty, else returns 0.
    
    The macro is a variadic macro taking any input.
    For the VC++8 compiler (VS2005) the macro takes a single parameter of input to check.
    
    For all levels of C++ prior to C++20 the macro is not perfect, 
    and can not be so. The problem area is if the input to be
    checked is a function-like macro name, in which case either
    a compiler error can result or a false result can occur.
    
    For C++20, with its support for the new __VA_OPT__ preprocessor
    construct, the macro will always work correctly no matter what
    the variadic input, and is therefore 100% reliable.
    
    This macro is a replacement, using variadic macro support,
    for the undocumented macro BOOST_PP_IS_EMPTY in the Boost
    PP library. The code is taken from a posting by Paul Mensonides
    of a variadic version for BOOST_PP_IS_EMPTY, and changed 
    in order to also support VC++. The code for the C++20
    implementation of the macro, using the __VA_OPT__ preprocessor
    construct, is the author's own and reuses code added to the
    Boost preprocessor library by this author.
    
    ... = variadic input, for VC++8 this must be a single parameter

returns = 1 if the input is empty, 0 if it is not
    
    It is recommended to append BOOST_PP_EMPTY() to whatever input
    is being tested in order to avoid possible warning messages 
    from some compilers about no parameters being passed to the macro
    when the input is truly empty.
    
*/

#if BOOST_VMD_MSVC_V8

#define BOOST_VMD_IS_EMPTY(sequence) \
    BOOST_VMD_DETAIL_IS_EMPTY_IIF \
      ( \
      BOOST_PP_IS_BEGIN_PARENS \
        ( \
        sequence \
        ) \
      ) \
      ( \
      BOOST_VMD_DETAIL_IS_EMPTY_GEN_ZERO, \
      BOOST_VMD_DETAIL_IS_EMPTY_PROCESS \
      ) \
    (sequence) \
/**/

#else

# if defined(__cplusplus) && __cplusplus > 201703L
#include <boost/preprocessor/variadic/has_opt.hpp>
#include <boost/preprocessor/facilities/is_empty.hpp>
#define BOOST_VMD_IS_EMPTY(...) \
    BOOST_VMD_DETAIL_IS_EMPTY_IIF \
      ( \
      BOOST_PP_VARIADIC_HAS_OPT() \
      ) \
      ( \
      BOOST_PP_IS_EMPTY_OPT, \
      BOOST_VMD_IS_EMPTY_NO_OPT \
      ) \
    (__VA_ARGS__) \
/**/
# else
#define BOOST_VMD_IS_EMPTY(...) \
    BOOST_VMD_IS_EMPTY_NO_OPT(__VA_ARGS__) \
/**/
# endif
#define BOOST_VMD_IS_EMPTY_NO_OPT(...) \
    BOOST_VMD_DETAIL_IS_EMPTY_IIF \
      ( \
      BOOST_PP_IS_BEGIN_PARENS \
        ( \
        __VA_ARGS__ \
        ) \
      ) \
      ( \
      BOOST_VMD_DETAIL_IS_EMPTY_GEN_ZERO, \
      BOOST_VMD_DETAIL_IS_EMPTY_PROCESS \
      ) \
    (__VA_ARGS__) \
/**/
#endif /* BOOST_VMD_MSVC_V8 */
#endif /* BOOST_PP_VARIADICS */
#endif /* BOOST_VMD_IS_EMPTY_HPP */

cmd: