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.
409 lines
19 KiB
409 lines
19 KiB
/////////////////////////////////////////////////////////////////////////////// |
|
/// \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 2008 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/config.hpp> |
|
#include <boost/preprocessor/arithmetic/add.hpp> |
|
#include <boost/preprocessor/arithmetic/sub.hpp> |
|
#include <boost/preprocessor/iteration/iterate.hpp> |
|
#include <boost/preprocessor/repetition/enum.hpp> |
|
#include <boost/preprocessor/repetition/enum_shifted.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_reference.hpp> |
|
#include <boost/type_traits/is_member_pointer.hpp> |
|
#include <boost/type_traits/is_member_object_pointer.hpp> |
|
#include <boost/type_traits/is_member_function_pointer.hpp> |
|
#include <boost/proto/proto_fwd.hpp> |
|
#include <boost/proto/tags.hpp> |
|
#include <boost/proto/eval.hpp> |
|
#include <boost/proto/traits.hpp> // for proto::child_c() |
|
#include <boost/proto/detail/decltype.hpp> |
|
|
|
namespace boost { namespace proto |
|
{ |
|
/// INTERNAL ONLY |
|
/// |
|
#define UNREF(x) typename boost::remove_reference<x>::type |
|
|
|
namespace context |
|
{ |
|
template< |
|
typename Expr |
|
, typename Context |
|
, typename Tag // = typename Expr::proto_tag |
|
, long Arity // = Expr::proto_arity_c |
|
> |
|
struct default_eval |
|
{}; |
|
|
|
template<typename Expr, typename Context> |
|
struct default_eval<Expr, Context, tag::terminal, 0> |
|
{ |
|
typedef |
|
typename proto::result_of::value<Expr &>::type |
|
result_type; |
|
|
|
result_type operator ()(Expr &expr, Context &) const |
|
{ |
|
return proto::value(expr); |
|
} |
|
}; |
|
|
|
/// INTERNAL ONLY |
|
/// |
|
#define BOOST_PROTO_UNARY_DEFAULT_EVAL(OP, TAG, MAKE) \ |
|
template<typename Expr, typename Context> \ |
|
struct default_eval<Expr, Context, TAG, 1> \ |
|
{ \ |
|
private: \ |
|
typedef typename proto::result_of::child_c<Expr, 0>::type e0; \ |
|
typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0; \ |
|
public: \ |
|
BOOST_PROTO_DECLTYPE_(OP proto::detail::MAKE<r0>(), result_type) \ |
|
result_type operator ()(Expr &expr, Context &ctx) const \ |
|
{ \ |
|
return OP proto::eval(proto::child_c<0>(expr), ctx); \ |
|
} \ |
|
}; \ |
|
/**/ |
|
|
|
/// INTERNAL ONLY |
|
/// |
|
#define BOOST_PROTO_BINARY_DEFAULT_EVAL(OP, TAG, LMAKE, RMAKE) \ |
|
template<typename Expr, typename Context> \ |
|
struct default_eval<Expr, Context, TAG, 2> \ |
|
{ \ |
|
private: \ |
|
typedef typename proto::result_of::child_c<Expr, 0>::type e0; \ |
|
typedef typename proto::result_of::child_c<Expr, 1>::type e1; \ |
|
typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0; \ |
|
typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1; \ |
|
public: \ |
|
BOOST_PROTO_DECLTYPE_( \ |
|
proto::detail::LMAKE<r0>() OP proto::detail::RMAKE<r1>() \ |
|
, result_type \ |
|
) \ |
|
result_type operator ()(Expr &expr, Context &ctx) const \ |
|
{ \ |
|
return proto::eval( \ |
|
proto::child_c<0>(expr), ctx) OP proto::eval(proto::child_c<1>(expr) \ |
|
, ctx \ |
|
); \ |
|
} \ |
|
}; \ |
|
/**/ |
|
|
|
BOOST_PROTO_UNARY_DEFAULT_EVAL(+, proto::tag::unary_plus, make) |
|
BOOST_PROTO_UNARY_DEFAULT_EVAL(-, proto::tag::negate, make) |
|
BOOST_PROTO_UNARY_DEFAULT_EVAL(*, proto::tag::dereference, make) |
|
BOOST_PROTO_UNARY_DEFAULT_EVAL(~, proto::tag::complement, make) |
|
BOOST_PROTO_UNARY_DEFAULT_EVAL(&, proto::tag::address_of, make) |
|
BOOST_PROTO_UNARY_DEFAULT_EVAL(!, proto::tag::logical_not, make) |
|
BOOST_PROTO_UNARY_DEFAULT_EVAL(++, proto::tag::pre_inc, make_mutable) |
|
BOOST_PROTO_UNARY_DEFAULT_EVAL(--, proto::tag::pre_dec, make_mutable) |
|
|
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(<<, proto::tag::shift_left, make_mutable, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(>>, proto::tag::shift_right, make_mutable, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(*, proto::tag::multiplies, make, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(/, proto::tag::divides, make, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(%, proto::tag::modulus, make, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(+, proto::tag::plus, make, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(-, proto::tag::minus, make, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(<, proto::tag::less, make, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(>, proto::tag::greater, make, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(<=, proto::tag::less_equal, make, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(>=, proto::tag::greater_equal, make, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(==, proto::tag::equal_to, make, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(!=, proto::tag::not_equal_to, make, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(||, proto::tag::logical_or, make, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(&&, proto::tag::logical_and, make, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(&, proto::tag::bitwise_and, make, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(|, proto::tag::bitwise_or, make, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(^, proto::tag::bitwise_xor, make, make) |
|
|
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(=, proto::tag::assign, make_mutable, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(<<=, proto::tag::shift_left_assign, make_mutable, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(>>=, proto::tag::shift_right_assign, make_mutable, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(*=, proto::tag::multiplies_assign, make_mutable, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(/=, proto::tag::divides_assign, make_mutable, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(%=, proto::tag::modulus_assign, make_mutable, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(+=, proto::tag::plus_assign, make_mutable, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(-=, proto::tag::minus_assign, make_mutable, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(&=, proto::tag::bitwise_and_assign, make_mutable, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(|=, proto::tag::bitwise_or_assign, make_mutable, make) |
|
BOOST_PROTO_BINARY_DEFAULT_EVAL(^=, proto::tag::bitwise_xor_assign, make_mutable, make) |
|
|
|
#undef BOOST_PROTO_UNARY_DEFAULT_EVAL |
|
#undef BOOST_PROTO_BINARY_DEFAULT_EVAL |
|
|
|
/// INTERNAL ONLY |
|
template<typename Expr, typename Context> |
|
struct is_member_function_eval |
|
: is_member_function_pointer< |
|
typename detail::uncvref< |
|
typename proto::result_of::eval< |
|
typename remove_reference< |
|
typename proto::result_of::child_c<Expr, 1>::type |
|
>::type |
|
, Context |
|
>::type |
|
>::type |
|
> |
|
{}; |
|
|
|
/// INTERNAL ONLY |
|
template<typename Expr, typename Context, bool IsMemFunCall> |
|
struct memfun_eval |
|
{ |
|
private: |
|
typedef typename result_of::child_c<Expr, 0>::type e0; |
|
typedef typename result_of::child_c<Expr, 1>::type e1; |
|
typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0; |
|
typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1; |
|
public: |
|
typedef typename detail::mem_ptr_fun<r0, r1>::result_type result_type; |
|
result_type operator ()(Expr &expr, Context &ctx) const |
|
{ |
|
return detail::mem_ptr_fun<r0, r1>()( |
|
proto::eval(proto::child_c<0>(expr), ctx) |
|
, proto::eval(proto::child_c<1>(expr), ctx) |
|
); |
|
} |
|
}; |
|
|
|
/// INTERNAL ONLY |
|
template<typename Expr, typename Context> |
|
struct memfun_eval<Expr, Context, true> |
|
{ |
|
private: |
|
typedef typename result_of::child_c<Expr, 0>::type e0; |
|
typedef typename result_of::child_c<Expr, 1>::type e1; |
|
typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0; |
|
typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1; |
|
public: |
|
typedef detail::memfun<r0, r1> result_type; |
|
result_type const operator ()(Expr &expr, Context &ctx) const |
|
{ |
|
return detail::memfun<r0, r1>( |
|
proto::eval(proto::child_c<0>(expr), ctx) |
|
, proto::eval(proto::child_c<1>(expr), ctx) |
|
); |
|
} |
|
}; |
|
|
|
template<typename Expr, typename Context> |
|
struct default_eval<Expr, Context, tag::mem_ptr, 2> |
|
: memfun_eval<Expr, Context, is_member_function_eval<Expr, Context>::value> |
|
{}; |
|
|
|
// Handle post-increment specially. |
|
template<typename Expr, typename Context> |
|
struct default_eval<Expr, Context, proto::tag::post_inc, 1> |
|
{ |
|
private: |
|
typedef typename proto::result_of::child_c<Expr, 0>::type e0; |
|
typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0; |
|
public: |
|
BOOST_PROTO_DECLTYPE_(proto::detail::make_mutable<r0>() ++, result_type) |
|
result_type operator ()(Expr &expr, Context &ctx) const |
|
{ |
|
return proto::eval(proto::child_c<0>(expr), ctx) ++; |
|
} |
|
}; |
|
|
|
// Handle post-decrement specially. |
|
template<typename Expr, typename Context> |
|
struct default_eval<Expr, Context, proto::tag::post_dec, 1> |
|
{ |
|
private: |
|
typedef typename proto::result_of::child_c<Expr, 0>::type e0; |
|
typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0; |
|
public: |
|
BOOST_PROTO_DECLTYPE_(proto::detail::make_mutable<r0>() --, result_type) |
|
result_type operator ()(Expr &expr, Context &ctx) const |
|
{ |
|
return proto::eval(proto::child_c<0>(expr), ctx) --; |
|
} |
|
}; |
|
|
|
// Handle subscript specially. |
|
template<typename Expr, typename Context> |
|
struct default_eval<Expr, Context, proto::tag::subscript, 2> |
|
{ |
|
private: |
|
typedef typename proto::result_of::child_c<Expr, 0>::type e0; |
|
typedef typename proto::result_of::child_c<Expr, 1>::type e1; |
|
typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0; |
|
typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1; |
|
public: |
|
BOOST_PROTO_DECLTYPE_(proto::detail::make_subscriptable<r0>()[proto::detail::make<r1>()], result_type) |
|
result_type operator ()(Expr &expr, Context &ctx) const |
|
{ |
|
return proto::eval(proto::child_c<0>(expr), ctx)[proto::eval(proto::child_c<1>(expr), ctx)]; |
|
} |
|
}; |
|
|
|
// Handle if_else_ specially. |
|
template<typename Expr, typename Context> |
|
struct default_eval<Expr, Context, proto::tag::if_else_, 3> |
|
{ |
|
private: |
|
typedef typename proto::result_of::child_c<Expr, 0>::type e0; |
|
typedef typename proto::result_of::child_c<Expr, 1>::type e1; |
|
typedef typename proto::result_of::child_c<Expr, 2>::type e2; |
|
typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0; |
|
typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1; |
|
typedef typename proto::result_of::eval<UNREF(e2), Context>::type r2; |
|
public: |
|
BOOST_PROTO_DECLTYPE_( |
|
proto::detail::make<r0>() |
|
? proto::detail::make<r1>() |
|
: proto::detail::make<r2>() |
|
, result_type |
|
) |
|
result_type operator ()(Expr &expr, Context &ctx) const |
|
{ |
|
return proto::eval(proto::child_c<0>(expr), ctx) |
|
? proto::eval(proto::child_c<1>(expr), ctx) |
|
: proto::eval(proto::child_c<2>(expr), ctx); |
|
} |
|
}; |
|
|
|
// Handle comma specially. |
|
template<typename Expr, typename Context> |
|
struct default_eval<Expr, Context, proto::tag::comma, 2> |
|
{ |
|
private: |
|
typedef typename proto::result_of::child_c<Expr, 0>::type e0; |
|
typedef typename proto::result_of::child_c<Expr, 1>::type e1; |
|
typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0; |
|
typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1; |
|
public: |
|
typedef typename proto::detail::comma_result<r0, r1>::type result_type; |
|
result_type operator ()(Expr &expr, Context &ctx) const |
|
{ |
|
return proto::eval(proto::child_c<0>(expr), ctx), proto::eval(proto::child_c<1>(expr), ctx); |
|
} |
|
}; |
|
|
|
// Handle function specially |
|
#define BOOST_PROTO_DEFAULT_EVAL_TYPE(Z, N, DATA) \ |
|
typename proto::result_of::eval< \ |
|
typename remove_reference< \ |
|
typename proto::result_of::child_c<DATA, N>::type \ |
|
>::type \ |
|
, Context \ |
|
>::type \ |
|
/**/ |
|
|
|
#define BOOST_PROTO_DEFAULT_EVAL(Z, N, DATA) \ |
|
proto::eval(proto::child_c<N>(DATA), context) \ |
|
/**/ |
|
|
|
template<typename Expr, typename Context> |
|
struct default_eval<Expr, Context, proto::tag::function, 1> |
|
{ |
|
typedef |
|
typename proto::detail::result_of_fixup< |
|
BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 0, Expr) |
|
>::type |
|
function_type; |
|
|
|
typedef |
|
typename BOOST_PROTO_RESULT_OF<function_type()>::type |
|
result_type; |
|
|
|
result_type operator ()(Expr &expr, Context &context) const |
|
{ |
|
return BOOST_PROTO_DEFAULT_EVAL(~, 0, expr)(); |
|
} |
|
}; |
|
|
|
template<typename Expr, typename Context> |
|
struct default_eval<Expr, Context, proto::tag::function, 2> |
|
{ |
|
typedef |
|
typename proto::detail::result_of_fixup< |
|
BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 0, Expr) |
|
>::type |
|
function_type; |
|
|
|
typedef |
|
typename detail::result_of_< |
|
function_type(BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 1, Expr)) |
|
>::type |
|
result_type; |
|
|
|
result_type operator ()(Expr &expr, Context &context) const |
|
{ |
|
return this->invoke( |
|
expr |
|
, context |
|
, is_member_function_pointer<function_type>() |
|
, is_member_object_pointer<function_type>() |
|
); |
|
} |
|
|
|
private: |
|
result_type invoke(Expr &expr, Context &context, mpl::false_, mpl::false_) const |
|
{ |
|
return BOOST_PROTO_DEFAULT_EVAL(~, 0, expr)(BOOST_PROTO_DEFAULT_EVAL(~, 1, expr)); |
|
} |
|
|
|
result_type invoke(Expr &expr, Context &context, mpl::true_, mpl::false_) const |
|
{ |
|
BOOST_PROTO_USE_GET_POINTER(); |
|
typedef typename detail::classtypeof<function_type>::type class_type; |
|
return ( |
|
BOOST_PROTO_GET_POINTER(class_type, BOOST_PROTO_DEFAULT_EVAL(~, 1, expr)) ->* |
|
BOOST_PROTO_DEFAULT_EVAL(~, 0, expr) |
|
)(); |
|
} |
|
|
|
result_type invoke(Expr &expr, Context &context, mpl::false_, mpl::true_) const |
|
{ |
|
BOOST_PROTO_USE_GET_POINTER(); |
|
typedef typename detail::classtypeof<function_type>::type class_type; |
|
return ( |
|
BOOST_PROTO_GET_POINTER(class_type, BOOST_PROTO_DEFAULT_EVAL(~, 1, expr)) ->* |
|
BOOST_PROTO_DEFAULT_EVAL(~, 0, expr) |
|
); |
|
} |
|
}; |
|
|
|
// Additional specialization are generated by the preprocessor |
|
#include <boost/proto/context/detail/default_eval.hpp> |
|
|
|
#undef BOOST_PROTO_DEFAULT_EVAL_TYPE |
|
#undef BOOST_PROTO_DEFAULT_EVAL |
|
|
|
/// default_context |
|
/// |
|
struct default_context |
|
{ |
|
/// default_context::eval |
|
/// |
|
template<typename Expr, typename ThisContext = default_context const> |
|
struct eval |
|
: default_eval<Expr, ThisContext> |
|
{}; |
|
}; |
|
|
|
} // namespace context |
|
|
|
}} // namespace boost::proto |
|
|
|
#undef UNREF |
|
|
|
#endif
|
|
|