mirror of
https://github.com/ecency/ecency-mobile.git
synced 2024-12-04 17:33:55 +03:00
96 lines
2.6 KiB
C++
96 lines
2.6 KiB
C++
|
|
// (C) Copyright Edward Diener 2011-2015
|
|
// 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.
|
|
|
|
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.
|
|
|
|
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++.
|
|
|
|
.... = 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
|
|
|
|
#define BOOST_VMD_IS_EMPTY(...) \
|
|
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 */
|