Update of /cvsroot/boost/boost/boost/xpressive/proto/context
In directory
sc8-pr-cvs3.sourceforge.net:/tmp/cvs-serv8078/boost/xpressive/proto/context
Added Files:
callable.hpp default.hpp
Log Message:
add ternary if_else operator, break context.hpp up, fix bug in
BOOST_PROTO_DEFINE_FUNCTION_TEMPLATE
--- NEW FILE: callable.hpp ---
#ifndef BOOST_PP_IS_ITERATING
///////////////////////////////////////////////////////////////////////////////
/// \file callable.hpp
/// Definintion of callable_context\<\>, an evaluation context for
/// proto::eval() that explodes each node and calls the derived context
/// type with the expressions constituents. If the derived context doesn't
/// have an overload that handles this node, fall-back to the
default_context.
/// TODO: make the fall-back configurable!
//
// Copyright 2004 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_CONTEXT_CALLABLE_HPP_EAN_06_23_2007
#define BOOST_PROTO_CONTEXT_CALLABLE_HPP_EAN_06_23_2007
#include <boost/xpressive/proto/detail/prefix.hpp> // must be first include
#include <boost/config.hpp>
#include <boost/detail/workaround.hpp>
#include <boost/preprocessor/cat.hpp>
#include <boost/preprocessor/iteration/iterate.hpp>
#include <boost/preprocessor/facilities/intercept.hpp>
#include <boost/preprocessor/repetition/enum_params.hpp>
#include <boost/preprocessor/repetition/enum_trailing.hpp>
#include <boost/preprocessor/arithmetic/inc.hpp>
#include <boost/preprocessor/selection/max.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/utility/result_of.hpp>
#include <boost/type_traits/remove_cv.hpp>
#include <boost/xpressive/proto/proto_fwd.hpp>
#include <boost/xpressive/proto/tags.hpp>
#include <boost/xpressive/proto/eval.hpp>
#include <boost/xpressive/proto/context/default.hpp>
#include <boost/xpressive/proto/detail/suffix.hpp> // must be last include
namespace boost { namespace proto
{
template<typename Expr, typename Context, long Arity =
Expr::proto_arity::value>
struct callable_eval
{};
namespace detail
{
struct dont_care
{
dont_care(...);
};
}
#define BOOST_PROTO_ARG_N_TYPE(Z, N, Expr)
\
typename proto::result_of::arg_c<Expr, N>::const_reference
\
/**/
#define BOOST_PROTO_ARG_N(Z, N, expr)
\
proto::arg_c<N>(expr)
\
/**/
#define BOOST_PP_ITERATION_PARAMS_1
\
(3, (0, BOOST_PROTO_MAX_ARITY,
<boost/xpressive/proto/context/callable.hpp>)) \
/**/
#include BOOST_PP_ITERATE()
#undef BOOST_PROTO_ARG_N_TYPE
#undef BOOST_PROTO_ARG_N
/// callable_context
///
template<typename Context>
struct callable_context
{
/// callable_context::eval
///
template<typename Expr>
struct eval
: callable_eval<Expr, Context>
{};
};
}}
#endif
#else
#define N BOOST_PP_ITERATION()
#define ARG_COUNT BOOST_PP_MAX(1, N)
template<typename Expr, typename Context>
struct callable_eval<Expr, Context, N>
{
private:
/// INTERNAL ONLY
///
typedef typename remove_cv<Context>::type context_type;
/// INTERNAL ONLY
///
struct inner_context
: context_type
{
inner_context();
struct private_type_ { private_type_ const &operator,(int)
const; };
typedef private_type_ const
&(*pointer_to_function)(BOOST_PP_ENUM_PARAMS(BOOST_PP_INC(ARG_COUNT),
detail::dont_care BOOST_PP_INTERCEPT));
operator pointer_to_function() const;
};
public:
typedef
typename boost::result_of<
Context(
typename Expr::proto_tag
BOOST_PP_ENUM_TRAILING(ARG_COUNT,
BOOST_PROTO_ARG_N_TYPE, Expr)
)
>::type
result_type;
result_type operator ()(Expr &expr, Context &context) const
{
BOOST_STATIC_CONSTANT(bool, value =
(
sizeof(yes_type) ==
sizeof(
callable_eval::check(
(static_cast<inner_context
&>(const_cast<context_type &>(context))(
typename Expr::proto_tag()
BOOST_PP_ENUM_TRAILING(ARG_COUNT,
BOOST_PROTO_ARG_N, expr)
), 0)
)
)));
return (*this)(expr, context, mpl::bool_<value>());
}
private:
typedef char yes_type;
typedef char (&no_type)[2];
template<typename T> static yes_type check(T const &);
static no_type check(typename inner_context::private_type_ const &);
result_type operator ()(Expr &expr, Context &context, mpl::true_)
const
{
return context(
typename Expr::proto_tag()
BOOST_PP_ENUM_TRAILING(ARG_COUNT, BOOST_PROTO_ARG_N, expr)
);
}
result_type operator ()(Expr &expr, Context &context, mpl::false_)
const
{
return default_eval<Expr, Context>()(expr, context);
}
};
#undef N
#undef ARG_COUNT
#endif
--- NEW FILE: default.hpp ---
#ifndef BOOST_PP_IS_ITERATING
///////////////////////////////////////////////////////////////////////////////
/// \file default.hpp
/// Definintion of default_context, a default evaluation context for
/// proto::eval() that uses Boost.Typeof to deduce return types
/// of the built-in operators.
//
// Copyright 2004 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_CONTEXT_DEFAULT_HPP_EAN_01_08_2007
#define BOOST_PROTO_CONTEXT_DEFAULT_HPP_EAN_01_08_2007
#include <boost/xpressive/proto/detail/prefix.hpp> // must be first include
#include <boost/config.hpp>
#include <boost/detail/workaround.hpp>
#include <boost/preprocessor/cat.hpp>
#include <boost/preprocessor/iteration/iterate.hpp>
#include <boost/preprocessor/facilities/intercept.hpp>
#include <boost/preprocessor/repetition/enum_shifted.hpp>
#include <boost/preprocessor/repetition/enum_params.hpp>
#include <boost/preprocessor/repetition/enum_trailing.hpp>
#include <boost/preprocessor/arithmetic/inc.hpp>
#include <boost/preprocessor/tuple/elem.hpp>
#include <boost/mpl/if.hpp>
#include <boost/typeof/typeof.hpp>
#include <boost/utility/result_of.hpp>
#include <boost/type_traits/is_const.hpp>
#include <boost/type_traits/is_function.hpp>
#include <boost/type_traits/remove_cv.hpp>
#include <boost/xpressive/proto/proto_fwd.hpp>
#include <boost/xpressive/proto/tags.hpp>
#include <boost/xpressive/proto/eval.hpp>
#include <boost/xpressive/proto/detail/suffix.hpp> // must be last include
// If we're generating doxygen documentation, hide all the nasty
// Boost.Typeof gunk.
#ifndef BOOST_PROTO_DOXYGEN_INVOKED
#define BOOST_PROTO_DECLTYPE_NESTED_TYPEDEF_TPL_(Nested, Expr)\
BOOST_TYPEOF_NESTED_TYPEDEF_TPL(BOOST_PP_CAT(nested_and_hidden_,
Nested), Expr)\
struct Nested\
: mpl::if_c<\
1==sizeof(detail::check_reference(Expr))\
, typename BOOST_PP_CAT(nested_and_hidden_, Nested)::type &\
, typename BOOST_PP_CAT(nested_and_hidden_, Nested)::type\
>\
{};
#define BOOST_PROTO_DECLTYPE_(Expr, Type)\
BOOST_PROTO_DECLTYPE_NESTED_TYPEDEF_TPL_(BOOST_PP_CAT(nested_,
Type), (Expr))\
typedef typename BOOST_PP_CAT(nested_, Type)::type Type;
#else
/// INTERNAL ONLY
///
#define BOOST_PROTO_DECLTYPE_NESTED_TYPEDEF_TPL_(Nested, Expr)
/// INTERNAL ONLY
///
#define BOOST_PROTO_DECLTYPE_(Expr, Type)\
typedef detail::unspecified Type;
#endif
namespace boost { namespace proto
{
template<typename Expr, typename Context, typename Tag = typename
Expr::proto_tag, long Arity = Expr::proto_arity::value>
struct default_eval
{};
namespace detail
{
template<typename T> T make();
template<typename T>
char check_reference(T &);
template<typename T>
char (&check_reference(T const &))[2];
template<typename A0, typename A1>
struct comma_result
{
BOOST_PROTO_DECLTYPE_((detail::make<A0>(), detail::make<A1>()),
type)
};
template<typename A0>
struct comma_result<A0, void>
{
typedef void type;
};
template<typename A1>
struct comma_result<void, A1>
{
typedef A1 type;
};
template<>
struct comma_result<void, void>
{
typedef void type;
};
template<typename T, typename U = T>
struct result_of_fixup
: mpl::if_<is_function<T>, T *, U>
{};
template<typename T, typename U>
struct result_of_fixup<T &, U>
: result_of_fixup<T, T>
{};
template<typename T, typename U>
struct result_of_fixup<T *, U>
: result_of_fixup<T, U>
{};
template<typename T, typename U>
struct result_of_fixup<T const, U>
: result_of_fixup<T, U>
{};
//// Tests for result_of_fixup
//struct bar {};
//BOOST_MPL_ASSERT((is_same<bar,
result_of_fixup<bar>::type>));
//BOOST_MPL_ASSERT((is_same<bar const, result_of_fixup<bar
const>::type>));
//BOOST_MPL_ASSERT((is_same<bar, result_of_fixup<bar
&>::type>));
//BOOST_MPL_ASSERT((is_same<bar const, result_of_fixup<bar const
&>::type>));
//BOOST_MPL_ASSERT((is_same<void(*)(),
result_of_fixup<void(*)()>::type>));
//BOOST_MPL_ASSERT((is_same<void(*)(), result_of_fixup<void(*
const)()>::type>));
//BOOST_MPL_ASSERT((is_same<void(*)(), result_of_fixup<void(*
const &)()>::type>));
//BOOST_MPL_ASSERT((is_same<void(*)(),
result_of_fixup<void(&)()>::type>));
#if BOOST_WORKAROUND(BOOST_MSVC, == 1400)
template<typename T> T &make_ref_(T &t);
template<typename T> T const &make_ref_(T const &t);
#define BOOST_PROTO_REF(x) detail::make_ref_(x)
#else
#define BOOST_PROTO_REF(x) x
#endif
}
/// INTERNAL ONLY
///
#define BOOST_PROTO_UNARY_OP_RESULT(Op, Tag)\
template<typename Expr, typename Context>\
struct default_eval<Expr, Context, Tag, 1>\
{\
private:\
static Expr &sexpr;\
static Context &sctx;\
public:\
BOOST_PROTO_DECLTYPE_(Op
proto::eval(BOOST_PROTO_REF(proto::arg_c<0>(sexpr)), sctx), result_type)\
result_type operator()(Expr &expr, Context &ctx) const\
{\
return Op proto::eval(proto::arg_c<0>(expr), ctx);\
}\
};\
/**/
/// INTERNAL ONLY
///
#define BOOST_PROTO_BINARY_OP_RESULT(Op, Tag)\
template<typename Expr, typename Context>\
struct default_eval<Expr, Context, Tag, 2>\
{\
private:\
static Expr &sexpr;\
static Context &sctx;\
public:\
BOOST_PROTO_DECLTYPE_(proto::eval(BOOST_PROTO_REF(proto::arg_c<0>(sexpr)),
sctx) Op proto::eval(BOOST_PROTO_REF(proto::arg_c<1>(sexpr)), sctx),
result_type)\
result_type operator()(Expr &expr, Context &ctx) const\
{\
return proto::eval(proto::arg_c<0>(expr), ctx) Op
proto::eval(proto::arg_c<1>(expr), ctx);\
}\
};\
/**/
BOOST_PROTO_UNARY_OP_RESULT(+, proto::tag::posit)
BOOST_PROTO_UNARY_OP_RESULT(-, proto::tag::negate)
BOOST_PROTO_UNARY_OP_RESULT(*, proto::tag::dereference)
BOOST_PROTO_UNARY_OP_RESULT(~, proto::tag::complement)
BOOST_PROTO_UNARY_OP_RESULT(&, proto::tag::address_of)
BOOST_PROTO_UNARY_OP_RESULT(!, proto::tag::logical_not)
BOOST_PROTO_UNARY_OP_RESULT(++, proto::tag::pre_inc)
BOOST_PROTO_UNARY_OP_RESULT(--, proto::tag::pre_dec)
BOOST_PROTO_BINARY_OP_RESULT(<<, proto::tag::shift_left)
BOOST_PROTO_BINARY_OP_RESULT(>>, proto::tag::shift_right)
BOOST_PROTO_BINARY_OP_RESULT(*, proto::tag::multiplies)
BOOST_PROTO_BINARY_OP_RESULT(/, proto::tag::divides)
BOOST_PROTO_BINARY_OP_RESULT(%, proto::tag::modulus)
BOOST_PROTO_BINARY_OP_RESULT(+, proto::tag::plus)
BOOST_PROTO_BINARY_OP_RESULT(-, proto::tag::minus)
BOOST_PROTO_BINARY_OP_RESULT(<, proto::tag::less)
BOOST_PROTO_BINARY_OP_RESULT(>, proto::tag::greater)
BOOST_PROTO_BINARY_OP_RESULT(<=, proto::tag::less_equal)
BOOST_PROTO_BINARY_OP_RESULT(>=, proto::tag::greater_equal)
BOOST_PROTO_BINARY_OP_RESULT(==, proto::tag::equal_to)
BOOST_PROTO_BINARY_OP_RESULT(!=, proto::tag::not_equal_to)
BOOST_PROTO_BINARY_OP_RESULT(||, proto::tag::logical_or)
BOOST_PROTO_BINARY_OP_RESULT(&&, proto::tag::logical_and)
BOOST_PROTO_BINARY_OP_RESULT(&, proto::tag::bitwise_and)
BOOST_PROTO_BINARY_OP_RESULT(|, proto::tag::bitwise_or)
BOOST_PROTO_BINARY_OP_RESULT(^, proto::tag::bitwise_xor)
BOOST_PROTO_BINARY_OP_RESULT(->*, proto::tag::mem_ptr)
BOOST_PROTO_BINARY_OP_RESULT(=, proto::tag::assign)
BOOST_PROTO_BINARY_OP_RESULT(<<=, proto::tag::shift_left_assign)
BOOST_PROTO_BINARY_OP_RESULT(>>=, proto::tag::shift_right_assign)
BOOST_PROTO_BINARY_OP_RESULT(*=, proto::tag::multilpies_assign)
BOOST_PROTO_BINARY_OP_RESULT(/=, proto::tag::divides_assign)
BOOST_PROTO_BINARY_OP_RESULT(%=, proto::tag::modulus_assign)
BOOST_PROTO_BINARY_OP_RESULT(+=, proto::tag::plus_assign)
BOOST_PROTO_BINARY_OP_RESULT(-=, proto::tag::minus_assign)
BOOST_PROTO_BINARY_OP_RESULT(&=, proto::tag::bitwise_and_assign)
BOOST_PROTO_BINARY_OP_RESULT(|=, proto::tag::bitwise_or_assign)
BOOST_PROTO_BINARY_OP_RESULT(^=, proto::tag::bitwise_xor_assign)
template<typename Expr, typename Context>
struct default_eval<Expr, Context, proto::tag::terminal, 0>
{
typedef
typename mpl::if_<
is_const<Expr>
, typename proto::result_of::arg<Expr>::const_reference
, typename proto::result_of::arg<Expr>::reference
>::type
result_type;
result_type operator()(Expr &expr, Context &) const
{
return proto::arg(expr);
}
};
// Handle post-increment specially.
template<typename Expr, typename Context>
struct default_eval<Expr, Context, proto::tag::post_inc, 1>
{
private:
static Expr &sexpr;
static Context &sctx;
public:
BOOST_PROTO_DECLTYPE_(proto::eval(BOOST_PROTO_REF(proto::arg_c<0>(sexpr)),
sctx) ++, result_type)
result_type operator()(Expr &expr, Context &ctx) const
{
return proto::eval(proto::arg_c<0>(expr), ctx) ++;
}
};
// Handle post-decrement specially.
template<typename Expr, typename Context>
struct default_eval<Expr, Context, proto::tag::post_dec, 1>
{
private:
static Expr &sexpr;
static Context &sctx;
public:
BOOST_PROTO_DECLTYPE_(proto::eval(BOOST_PROTO_REF(proto::arg_c<0>(sexpr)),
sctx) --, result_type)
result_type operator()(Expr &expr, Context &ctx) const
{
return proto::eval(proto::arg_c<0>(expr), ctx) --;
}
};
// Handle subscript specially.
template<typename Expr, typename Context>
struct default_eval<Expr, Context, proto::tag::subscript, 2>
{
private:
static Expr &sexpr;
static Context &sctx;
public:
BOOST_PROTO_DECLTYPE_(proto::eval(BOOST_PROTO_REF(proto::arg_c<0>(sexpr)),
sctx)[proto::eval(BOOST_PROTO_REF(proto::arg_c<1>(sexpr)), sctx)], result_type)
result_type operator()(Expr &expr, Context &ctx) const
{
return proto::eval(proto::arg_c<0>(expr),
ctx)[proto::eval(proto::arg_c<1>(expr), ctx)];
}
};
// Handle if_else_ specially.
template<typename Expr, typename Context>
struct default_eval<Expr, Context, proto::tag::if_else_, 3>
{
private:
static Expr &sexpr;
static Context &sctx;
public:
BOOST_PROTO_DECLTYPE_(
proto::eval(BOOST_PROTO_REF(proto::arg_c<0>(sexpr)), sctx)
? proto::eval(BOOST_PROTO_REF(proto::arg_c<1>(sexpr)), sctx)
: proto::eval(BOOST_PROTO_REF(proto::arg_c<2>(sexpr)), sctx)
, result_type
)
result_type operator()(Expr &expr, Context &ctx) const
{
return proto::eval(proto::arg_c<0>(expr), ctx)
? proto::eval(proto::arg_c<1>(expr), ctx)
: proto::eval(proto::arg_c<2>(expr), ctx);
}
};
// Handle comma specially.
template<typename Expr, typename Context>
struct default_eval<Expr, Context, proto::tag::comma, 2>
{
typedef typename proto::result_of::eval<typename
proto::result_of::arg_c<Expr, 0>::type, Context>::type proto_arg0;
typedef typename proto::result_of::eval<typename
proto::result_of::arg_c<Expr, 1>::type, Context>::type proto_arg1;
typedef typename detail::comma_result<proto_arg0, proto_arg1>::type
result_type;
result_type operator()(Expr &expr, Context &ctx) const
{
return proto::eval(proto::arg_c<0>(expr), ctx),
proto::eval(proto::arg_c<1>(expr), ctx);
}
};
#define BOOST_PROTO_EVAL_N_TYPE(Z, N, Data)\
typename proto::result_of::eval<\
typename proto::result_of::arg_c<BOOST_PP_TUPLE_ELEM(2, 0, Data),
N>::type\
, BOOST_PP_TUPLE_ELEM(2, 1, Data)\
>::type
#define BOOST_PROTO_EVAL_N(Z, N, Data)\
proto::eval(proto::arg_c<N>(BOOST_PP_TUPLE_ELEM(2, 0, Data)),
BOOST_PP_TUPLE_ELEM(2, 1, Data))
#define BOOST_PP_ITERATION_PARAMS_1 (3, (1, BOOST_PROTO_MAX_ARITY,
<boost/xpressive/proto/context/default.hpp>))
#include BOOST_PP_ITERATE()
#undef BOOST_PROTO_EVAL_N_TYPE
#undef BOOST_PROTO_EVAL_N
/// default_context
///
struct default_context
{
/// default_context::eval
///
template<typename Expr>
struct eval
: default_eval<Expr, default_context const>
{};
};
}}
#undef BOOST_PROTO_DECLTYPE_NESTED_TYPEDEF_TPL_
#undef BOOST_PROTO_DECLTYPE_
#endif
#else
#define N BOOST_PP_ITERATION()
// Handle function specially
template<typename Expr, typename Context>
struct default_eval<Expr, Context, proto::tag::function, N>
{
typedef
typename detail::result_of_fixup<
BOOST_PROTO_EVAL_N_TYPE(1, 0, (Expr, Context))
>::type
function_type;
typedef
typename boost::result_of<
function_type(
BOOST_PP_ENUM_SHIFTED(N, BOOST_PROTO_EVAL_N_TYPE,
(Expr, Context))
)
>::type
result_type;
result_type operator ()(Expr &expr, Context &context) const
{
return BOOST_PROTO_EVAL_N(1, 0, (expr, context))(
BOOST_PP_ENUM_SHIFTED(N, BOOST_PROTO_EVAL_N, (expr,
context))
);
}
};
#undef N
#endif
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