You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and dots ('.'), can be up to 35 characters long. Letters must be lowercase.
87 lines
2.9 KiB
87 lines
2.9 KiB
// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) |
|
// (C) Copyright 2003-2007 Jonathan Turkanis |
|
// Distributed under 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.) |
|
|
|
// See http://www.boost.org/libs/iostreams for documentation. |
|
|
|
// Contains the definition of the class template access_control, which |
|
// allows the type of inheritance from a provided base class to be specified |
|
// using a template parameter. |
|
|
|
|
|
#ifndef BOOST_IOSTREAMS_ACCESS_CONTROL_HPP_INCLUDED |
|
#define BOOST_IOSTREAMS_ACCESS_CONTROL_HPP_INCLUDED |
|
|
|
#if defined(_MSC_VER) && (_MSC_VER >= 1020) |
|
# pragma once |
|
#endif |
|
|
|
#include <boost/iostreams/detail/select.hpp> |
|
#include <boost/mpl/identity.hpp> |
|
#include <boost/type_traits/is_same.hpp> |
|
|
|
namespace boost { namespace iostreams { |
|
|
|
struct protected_ { }; // Represents protected inheritance. |
|
struct public_ { }; // Represents public inheritance. |
|
|
|
|
|
namespace detail { |
|
|
|
// Implements protected inheritance. |
|
template<typename U> |
|
struct prot_ : protected U |
|
{ |
|
prot_() { } |
|
template<typename V> prot_(V v) : U(v) { } |
|
}; |
|
|
|
// Implements public inheritance. |
|
template<typename U> struct pub_ : public U { |
|
pub_() { } |
|
template<typename V> pub_(V v) : U(v) { } |
|
}; |
|
|
|
// |
|
// Used to deduce the base type for the template access_control. |
|
// |
|
template<typename T, typename Access> |
|
struct access_control_base { |
|
typedef int bad_access_specifier; |
|
typedef typename |
|
iostreams::select< // Disambiguation for Tru64 |
|
::boost::is_same< |
|
Access, protected_ |
|
>, prot_<T>, |
|
::boost::is_same< |
|
Access, public_ |
|
>, pub_<T>, |
|
else_, bad_access_specifier |
|
>::type type; |
|
}; |
|
|
|
} // End namespace detail. |
|
|
|
// |
|
// Template name: access_control. |
|
// Description: Allows the type of inheritance from a provided base class |
|
// to be specified using an int template parameter. |
|
// Template parameters: |
|
// Base - The class from which to inherit (indirectly.) |
|
// Access - The type of access desired. Must be one of the |
|
// values access_base::prot or access_base::pub. |
|
// |
|
template< typename T, typename Access, |
|
typename Base = // VC6 workaraound (Compiler Error C2516) |
|
typename detail::access_control_base<T, Access>::type > |
|
struct access_control : public Base { |
|
access_control() { } |
|
template<typename U> explicit access_control(U u) : Base(u) { } |
|
}; |
|
|
|
//----------------------------------------------------------------------------// |
|
|
|
} } // End namespaces iostreams, boost. |
|
|
|
#endif // #ifndef BOOST_IOSTREAMS_ACCESS_CONTROL_HPP_INCLUDED
|
|
|