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Diffstat (limited to 'contrib/src/boost/utility/base_from_member.hpp')
| -rw-r--r-- | contrib/src/boost/utility/base_from_member.hpp | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/contrib/src/boost/utility/base_from_member.hpp b/contrib/src/boost/utility/base_from_member.hpp new file mode 100644 index 0000000..fc0e13c --- /dev/null +++ b/contrib/src/boost/utility/base_from_member.hpp @@ -0,0 +1,171 @@ +// boost utility/base_from_member.hpp header file --------------------------// + +// Copyright 2001, 2003, 2004, 2012 Daryle Walker. Use, modification, and +// distribution are subject to the Boost Software License, Version 1.0. (See +// accompanying file LICENSE_1_0.txt or a copy at +// <http://www.boost.org/LICENSE_1_0.txt>.) + +// See <http://www.boost.org/libs/utility/> for the library's home page. + +#ifndef BOOST_UTILITY_BASE_FROM_MEMBER_HPP +#define BOOST_UTILITY_BASE_FROM_MEMBER_HPP + +#include <boost/config.hpp> +#include <boost/preprocessor/arithmetic/inc.hpp> +#include <boost/preprocessor/repetition/enum_binary_params.hpp> +#include <boost/preprocessor/repetition/enum_params.hpp> +#include <boost/preprocessor/repetition/repeat_from_to.hpp> +#include <boost/type_traits/is_same.hpp> +#include <boost/type_traits/remove_cv.hpp> +#include <boost/type_traits/remove_reference.hpp> +#include <boost/utility/enable_if.hpp> + + +// Base-from-member arity configuration macro ------------------------------// + +// The following macro determines how many arguments will be in the largest +// constructor template of base_from_member. Constructor templates will be +// generated from one argument to this maximum. Code from other files can read +// this number if they need to always match the exact maximum base_from_member +// uses. The maximum constructor length can be changed by overriding the +// #defined constant. Make sure to apply the override, if any, for all source +// files during project compiling for consistency. + +// Contributed by Jonathan Turkanis + +#ifndef BOOST_BASE_FROM_MEMBER_MAX_ARITY +#define BOOST_BASE_FROM_MEMBER_MAX_ARITY 10 +#endif + + +// An iteration of a constructor template for base_from_member -------------// + +// A macro that should expand to: +// template < typename T1, ..., typename Tn > +// base_from_member( T1 x1, ..., Tn xn ) +// : member( x1, ..., xn ) +// {} +// This macro should only persist within this file. + +#define BOOST_PRIVATE_CTR_DEF( z, n, data ) \ + template < BOOST_PP_ENUM_PARAMS(n, typename T) > \ + explicit base_from_member( BOOST_PP_ENUM_BINARY_PARAMS(n, T, x) ) \ + : member( BOOST_PP_ENUM_PARAMS(n, x) ) \ + {} \ + /**/ + + +namespace boost +{ + +namespace detail +{ + +// Type-unmarking class template -------------------------------------------// + +// Type-trait to get the raw type, i.e. the type without top-level reference nor +// cv-qualification, from a type expression. Mainly for function arguments, any +// reference part is stripped first. + +// Contributed by Daryle Walker + +template < typename T > +struct remove_cv_ref +{ + typedef typename ::boost::remove_cv<typename + ::boost::remove_reference<T>::type>::type type; + +}; // boost::detail::remove_cv_ref + +// Unmarked-type comparison class template ---------------------------------// + +// Type-trait to check if two type expressions have the same raw type. + +// Contributed by Daryle Walker, based on a work-around by Luc Danton + +template < typename T, typename U > +struct is_related + : public ::boost::is_same< + typename ::boost::detail::remove_cv_ref<T>::type, + typename ::boost::detail::remove_cv_ref<U>::type > +{}; + +// Enable-if-on-unidentical-unmarked-type class template -------------------// + +// Enable-if on the first two type expressions NOT having the same raw type. + +// Contributed by Daryle Walker, based on a work-around by Luc Danton + +#ifndef BOOST_NO_CXX11_VARIADIC_TEMPLATES +template<typename ...T> +struct enable_if_unrelated + : public ::boost::enable_if_c<true> +{}; + +template<typename T, typename U, typename ...U2> +struct enable_if_unrelated<T, U, U2...> + : public ::boost::disable_if< ::boost::detail::is_related<T, U> > +{}; +#endif + +} // namespace boost::detail + + +// Base-from-member class template -----------------------------------------// + +// Helper to initialize a base object so a derived class can use this +// object in the initialization of another base class. Used by +// Dietmar Kuehl from ideas by Ron Klatcho to solve the problem of a +// base class needing to be initialized by a member. + +// Contributed by Daryle Walker + +template < typename MemberType, int UniqueID = 0 > +class base_from_member +{ +protected: + MemberType member; + +#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && \ + !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && \ + !defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS) && \ + !(defined(__GNUC__) && (__GNUC__ == 4) && (__GNUC_MINOR__ < 4)) + template <typename ...T, typename EnableIf = typename + ::boost::detail::enable_if_unrelated<base_from_member, T...>::type> + explicit BOOST_CONSTEXPR base_from_member( T&& ...x ) + BOOST_NOEXCEPT_IF( BOOST_NOEXCEPT_EXPR(::new ((void*) 0) MemberType( + static_cast<T&&>(x)... )) ) // no std::is_nothrow_constructible... + : member( static_cast<T&&>(x)... ) // ...nor std::forward needed + {} +#else + base_from_member() + : member() + {} + + BOOST_PP_REPEAT_FROM_TO( 1, BOOST_PP_INC(BOOST_BASE_FROM_MEMBER_MAX_ARITY), + BOOST_PRIVATE_CTR_DEF, _ ) +#endif + +}; // boost::base_from_member + +template < typename MemberType, int UniqueID > +class base_from_member<MemberType&, UniqueID> +{ +protected: + MemberType& member; + + explicit BOOST_CONSTEXPR base_from_member( MemberType& x ) + BOOST_NOEXCEPT + : member( x ) + {} + +}; // boost::base_from_member + +} // namespace boost + + +// Undo any private macros +#undef BOOST_PRIVATE_CTR_DEF + + +#endif // BOOST_UTILITY_BASE_FROM_MEMBER_HPP |