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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\xpressive\proto\transform\fold.hpp
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#ifndef BOOST_PP_IS_ITERATING /////////////////////////////////////////////////////////////////////////////// /// \file fold.hpp /// A special-purpose proto transform for merging sequences of binary operations. /// It transforms the right operand and passes the result as state while transforming /// the left. Or, it might do the left first, if you choose. // // Copyright 2007 Eric Niebler. 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) #ifndef BOOST_PROTO_TRANSFORM_FOLD_HPP_EAN_12_16_2006 #define BOOST_PROTO_TRANSFORM_FOLD_HPP_EAN_12_16_2006 #include
#include
#include
#include
#include
#include
#include
#include
#include
#include
namespace boost { namespace proto { namespace transform { namespace detail { template
struct fold_impl {}; template
struct reverse_fold_impl {}; #define BOOST_PROTO_ARG_N_TYPE(n)\ BOOST_PP_CAT(proto_arg, n)\ /**/ #define BOOST_PROTO_FOLD_STATE_TYPE(z, n, data)\ typedef typename Grammar::BOOST_PROTO_ARG_N_TYPE(n)::template\ apply
::type\ BOOST_PP_CAT(state, BOOST_PP_INC(n));\ /**/ #define BOOST_PROTO_FOLD_STATE(z, n, data)\ BOOST_PP_CAT(state, BOOST_PP_INC(n)) const &BOOST_PP_CAT(s, BOOST_PP_INC(n)) =\ Grammar::BOOST_PROTO_ARG_N_TYPE(n)::call(expr.BOOST_PP_CAT(arg, n).proto_base(), BOOST_PP_CAT(s, n), visitor);\ /**/ #define BOOST_PROTO_REVERSE_FOLD_STATE_TYPE(z, n, data)\ typedef typename Grammar::BOOST_PROTO_ARG_N_TYPE(BOOST_PP_SUB(data, BOOST_PP_INC(n)))::template\ apply
::type\ BOOST_PP_CAT(state, BOOST_PP_SUB(data, BOOST_PP_INC(n)));\ /**/ #define BOOST_PROTO_REVERSE_FOLD_STATE(z, n, data)\ BOOST_PP_CAT(state, BOOST_PP_SUB(data, BOOST_PP_INC(n))) const &BOOST_PP_CAT(s, BOOST_PP_SUB(data, BOOST_PP_INC(n))) =\ Grammar::BOOST_PROTO_ARG_N_TYPE(BOOST_PP_SUB(data, BOOST_PP_INC(n)))::call(expr.BOOST_PP_CAT(arg, BOOST_PP_SUB(data, BOOST_PP_INC(n))).proto_base(), BOOST_PP_CAT(s, BOOST_PP_SUB(data, n)), visitor);\ /**/ #define BOOST_PP_ITERATION_PARAMS_1 (3, (1, BOOST_PROTO_MAX_ARITY,
)) #include BOOST_PP_ITERATE() #undef BOOST_PROTO_REVERSE_FOLD_STATE #undef BOOST_PROTO_REVERSE_FOLD_STATE_TYPE #undef BOOST_PROTO_FOLD_STATE #undef BOOST_PROTO_FOLD_STATE_TYPE #undef BOOST_PROTO_ARG_N_TYPE } // A fold transform that transforms the left sub-tree and // uses the result as state while transforming the right. template
struct fold
: Grammar { fold() {} template
struct apply : detail::fold_impl
{}; template
static typename apply
::type call(Expr const &expr, State const &state, Visitor &visitor) { return apply
::call(expr.proto_base(), state, visitor); } }; // A reverse_fold compiler that compiles the right sub-tree and // uses the result as state while compiling the left. template
struct reverse_fold
: Grammar { reverse_fold() {} template
struct apply : detail::reverse_fold_impl
{}; template
static typename apply
::type call(Expr const &expr, State const &state, Visitor &visitor) { return apply
::call(expr.proto_base(), state, visitor); } }; // Causes Doxygen to crash. Sigh. #ifndef BOOST_PROTO_DOXYGEN_INVOKED template
struct fold : branch
, State> {}; template
struct reverse_fold : branch
, State> {}; #endif }}} namespace boost { namespace proto { template
struct is_transform
> : mpl::true_ {}; template
struct is_transform
> : mpl::true_ {}; }} #endif #else #define N BOOST_PP_ITERATION() template
struct fold_impl
{ BOOST_PP_REPEAT(N, BOOST_PROTO_FOLD_STATE_TYPE, N) typedef BOOST_PP_CAT(state, N) type; static type call(Expr const &expr, state0 const &s0, Visitor &visitor) { BOOST_PP_REPEAT(N, BOOST_PROTO_FOLD_STATE, N) return BOOST_PP_CAT(s, N); } }; template
struct reverse_fold_impl
{ BOOST_PP_REPEAT(N, BOOST_PROTO_REVERSE_FOLD_STATE_TYPE, N) typedef state0 type; static type call(Expr const &expr, BOOST_PP_CAT(state, N) const &BOOST_PP_CAT(s, N), Visitor &visitor) { BOOST_PP_REPEAT(N, BOOST_PROTO_REVERSE_FOLD_STATE, N) return s0; } }; #undef N #endif
fold.hpp
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