1
2// (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes,
3// Howard Hinnant and John Maddock 2000.
4// (C) Copyright Mat Marcus, Jesse Jones and Adobe Systems Inc 2001
5
6// Use, modification and distribution are subject to the Boost Software License,
7// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
8// http://www.boost.org/LICENSE_1_0.txt).
9//
10// See http://www.boost.org/libs/type_traits for most recent version including documentation.
11
12// Fixed is_pointer, is_reference, is_const, is_volatile, is_same,
13// is_member_pointer based on the Simulated Partial Specialization work
14// of Mat Marcus and Jesse Jones. See http://opensource.adobe.com or
15// http://groups.yahoo.com/group/boost/message/5441
16// Some workarounds in here use ideas suggested from "Generic<Programming>:
17// Mappings between Types and Values"
18// by Andrei Alexandrescu (see http://www.cuj.com/experts/1810/alexandr.html).
19
20
21#ifndef BOOST_TT_IS_CONST_HPP_INCLUDED
22#define BOOST_TT_IS_CONST_HPP_INCLUDED
23
24#include <cstddef> // size_t
25#include <boost/type_traits/integral_constant.hpp>
26
27namespace boost {
28
29#if defined( BOOST_CODEGEARC )
30
31 template <class T>
32 struct is_const : public integral_constant<bool, __is_const(T)> {};
33
34#else
35
36 template <class T>
37 struct is_const : public false_type {};
38 template <class T> struct is_const<T const> : public true_type{};
39 template <class T, std::size_t N> struct is_const<T const[N]> : public true_type{};
40 template <class T> struct is_const<T const[]> : public true_type{};
41
42#endif
43
44} // namespace boost
45
46#endif // BOOST_TT_IS_CONST_HPP_INCLUDED
47
48

source code of include/boost/type_traits/is_const.hpp