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select_by_size.hpp - Hosted on DriveHQ Cloud IT Platform
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Ruta de la carpeta: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\iostreams\detail\select_by_size.hpp
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// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) // (C) Copyright 2004-2007 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. // // Intended as an alternative to type_traits::yes_type and type_traits::no_type. // Provides an arbitrary number of types (case_<0>, case_<1>, ...) for // determining the results of overload resultion using 'sizeof', plus a uniform // means of using the result. yes_type and no_type are typedefs for case_<1> // and case_<0>. A single case with negative argument, case_<-1>, is also // provided, for convenience. // // This header may be included any number of times, with // BOOST_SELECT_BY_SIZE_MAX_CASE defined to be the largest N such that case_
// is needed for a particular application. It defaults to 20. // // This header depends only on Boost.Config and Boost.Preprocessor. Dependence // on Type Traits or MPL was intentionally avoided, to leave open the // possibility that select_by_size could be used by these libraries. // // Example usage: // // #define BOOST_SELECT_BY_SIZE_MAX_CASE 7 // (Needed when default was 2) // #include
// // using namespace boost::utility; // // case_<0> helper(bool); // case_<1> helper(int); // case_<2> helper(unsigned); // case_<3> helper(long); // case_<4> helper(unsigned long); // case_<5> helper(float); // case_<6> helper(double); // case_<7> helper(const char*); // // struct test { // static const int value = // select_by_size< sizeof(helper(9876UL)) >::value; // BOOST_STATIC_ASSERT(value == 4); // }; // // For compilers with integral constant expression problems, e.g. Borland 5.x, // one can also write // // struct test { // BOOST_SELECT_BY_SIZE(int, value, helper(9876UL)); // }; // // to define a static integral constant 'value' equal to // // select_by_size< sizeof(helper(9876UL)) >::value. // // Include guards surround all contents of this header except for explicit // specializations of select_by_size for case_
with N > 2. #ifndef BOOST_IOSTREAMS_DETAIL_SELECT_BY_SIZE_HPP_INCLUDED #define BOOST_IOSTREAMS_DETAIL_SELECT_BY_SIZE_HPP_INCLUDED // The lowest N for which select_by_size< sizeof(case_
) > has not been // specialized. #define SELECT_BY_SIZE_MAX_SPECIALIZED 20 #include
// BOOST_STATIC_CONSTANT. #include
#include
/* Alternative implementation using max_align. #include
#include
namespace boost { namespace utility { template
struct case_ { char c[(N + 1) * alignment_of
::value]; }; template
struct select_by_size { BOOST_STATIC_CONSTANT(int, value = (Size / alignment_of
::value - 1)); }; } } // End namespaces utility, boost. */ // End alternate implementation. namespace boost { namespace iostreams { namespace detail { //--------------Definition of case_-------------------------------------------// template
struct case_ { char c1; case_
c2; }; template<> struct case_<-1> { char c; }; typedef case_
yes_type; typedef case_
no_type; //--------------Declaration of select_by_size---------------------------------// template
struct select_by_size; } } } // End namespaces detail, iostreams, boost. //--------------Definition of SELECT_BY_SIZE_SPEC-----------------------------// // Sepecializes select_by_size for sizeof(case
). The decrement is used // here because the preprocessor library doesn't handle negative integers. #define SELECT_BY_SIZE_SPEC(n) \ namespace boost { namespace iostreams { namespace detail { \ static const int BOOST_PP_CAT(sizeof_case_, n) = sizeof(case_
); \ template<> \ struct select_by_size< BOOST_PP_CAT(sizeof_case_, n) > { \ struct type { BOOST_STATIC_CONSTANT(int, value = n - 1); }; \ BOOST_STATIC_CONSTANT(int, value = type::value); \ }; \ } } } \ /**/ //--------------Default specializations of select_by_size---------------------// #define BOOST_PP_LOCAL_MACRO(n) SELECT_BY_SIZE_SPEC(n) #define BOOST_PP_LOCAL_LIMITS (0, 20) #include BOOST_PP_LOCAL_ITERATE() #undef BOOST_PP_LOCAL_MACRO //--------------Definition of SELECT_BY_SIZE----------------------------------// #define BOOST_SELECT_BY_SIZE(type_, name, expr) \ BOOST_STATIC_CONSTANT( \ unsigned, \ BOOST_PP_CAT(boost_select_by_size_temp_, name) = sizeof(expr) \ ); \ BOOST_STATIC_CONSTANT( \ type_, \ name = \ ( ::boost::iostreams::detail::select_by_size< \ BOOST_PP_CAT(boost_select_by_size_temp_, name) \ >::value ) \ ) \ /**/ #endif // #ifndef BOOST_IOSTREAMS_DETAIL_SELECT_BY_SIZE_HPP_INCLUDED //----------Specializations of SELECT_BY_SIZE (outside main inclued guards)---// #if BOOST_SELECT_BY_SIZE_MAX_CASE > SELECT_BY_SIZE_MAX_SPECIALIZED #define BOOST_PP_LOCAL_MACRO(n) SELECT_BY_SIZE_SPEC(n) #define BOOST_PP_LOCAL_LIMITS \ (SELECT_BY_SIZE_MAX_SPECIALIZED, BOOST_SELECT_BY_SIZE_MAX_CASE) \ /**/ #include BOOST_PP_LOCAL_ITERATE() #undef BOOST_PP_LOCAL_MACRO #undef SELECT_BY_SIZE_MAX_SPECIALIZED #define SELECT_BY_SIZE_MAX_SPECIALIZED BOOST_SELECT_BY_SIZE_MAX_CASE #endif
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