Added thirdparty: boost library

thirdparty/include/boost/vmd/is_general_identifier.hpp

@@ -0,0 +1,59 @@
+
+//  (C) Copyright Edward Diener 2020
+//  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_GENERAL_IDENTIFIER_HPP)
+#define BOOST_VMD_IS_GENERAL_IDENTIFIER_HPP
+
+#include <boost/vmd/detail/setup.hpp>
+
+#if BOOST_PP_VARIADICS
+
+#include <boost/vmd/detail/is_general_identifier.hpp>
+
+/*
+
+  The succeeding comments in this file are in doxygen format.
+
+*/
+
+/** \file
+*/
+
+/** \def BOOST_VMD_IS_GENERAL_IDENTIFIER(...)
+
+    \brief Tests whether a parameter is a general identifier.
+
+    ...       = variadic parameters
+    
+    The first variadic parameter is required and it is the input to test.
+    
+    Passing more than one variadic argument is an error.
+
+  @code
+  
+    returns   = 1 if the parameter is any general identifier and only a single variadic argument is given, otherwise 0.
+                
+  @endcode
+  
+    The argument to the macro should be a single possible identifier
+    and not a VMD sequence of preprocessor tokens.
+  
+    If the input is not a VMD data type this macro could lead to
+    a preprocessor error. This is because the macro
+    uses preprocessor concatenation to determine if the input
+    is an identifier once it is determined that the input is not empty
+    and does not start with parenthesis. If the data being concatenated would
+    lead to an invalid preprocessor token the compiler can issue
+    a preprocessor error.
+    
+*/
+
+#define BOOST_VMD_IS_GENERAL_IDENTIFIER(...) \
+    BOOST_VMD_DETAIL_IS_GENERAL_IDENTIFIER(__VA_ARGS__) \
+/**/
+
+#endif /* BOOST_PP_VARIADICS */
+#endif /* BOOST_VMD_IS_GENERAL_IDENTIFIER_HPP */