Mercurial > hg > vamp-build-and-test
diff DEPENDENCIES/generic/include/boost/proto/transform/call.hpp @ 16:2665513ce2d3
Add boost headers
| author | Chris Cannam |
|---|---|
| date | Tue, 05 Aug 2014 11:11:38 +0100 |
| parents | |
| children | c530137014c0 |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/DEPENDENCIES/generic/include/boost/proto/transform/call.hpp Tue Aug 05 11:11:38 2014 +0100 @@ -0,0 +1,401 @@ +/////////////////////////////////////////////////////////////////////////////// +/// \file call.hpp +/// Contains definition of the call<> transform. +// +// 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_TRANSFORM_CALL_HPP_EAN_11_02_2007 +#define BOOST_PROTO_TRANSFORM_CALL_HPP_EAN_11_02_2007 + +#if defined(_MSC_VER) && (_MSC_VER >= 1020) +# pragma warning(push) +# pragma warning(disable: 4714) // function 'xxx' marked as __forceinline not inlined +#endif + +#include <boost/preprocessor/cat.hpp> +#include <boost/preprocessor/facilities/intercept.hpp> +#include <boost/preprocessor/iteration/iterate.hpp> +#include <boost/preprocessor/repetition/enum.hpp> +#include <boost/preprocessor/repetition/repeat.hpp> +#include <boost/preprocessor/repetition/enum_params.hpp> +#include <boost/preprocessor/repetition/enum_binary_params.hpp> +#include <boost/preprocessor/repetition/enum_trailing_params.hpp> +#include <boost/ref.hpp> +#include <boost/utility/result_of.hpp> +#include <boost/proto/proto_fwd.hpp> +#include <boost/proto/traits.hpp> +#include <boost/proto/transform/impl.hpp> +#include <boost/proto/detail/as_lvalue.hpp> +#include <boost/proto/detail/poly_function.hpp> +#include <boost/proto/transform/detail/pack.hpp> + +namespace boost { namespace proto +{ + /// \brief Wrap \c PrimitiveTransform so that <tt>when\<\></tt> knows + /// it is callable. Requires that the parameter is actually a + /// PrimitiveTransform. + /// + /// This form of <tt>call\<\></tt> is useful for annotating an + /// arbitrary PrimitiveTransform as callable when using it with + /// <tt>when\<\></tt>. Consider the following transform, which + /// is parameterized with another transform. + /// + /// \code + /// template<typename Grammar> + /// struct Foo + /// : when< + /// unary_plus<Grammar> + /// , Grammar(_child) // May or may not work. + /// > + /// {}; + /// \endcode + /// + /// The problem with the above is that <tt>when\<\></tt> may or + /// may not recognize \c Grammar as callable, depending on how + /// \c Grammar is implemented. (See <tt>is_callable\<\></tt> for + /// a discussion of this issue.) You can guard against + /// the issue by wrapping \c Grammar in <tt>call\<\></tt>, such + /// as: + /// + /// \code + /// template<typename Grammar> + /// struct Foo + /// : when< + /// unary_plus<Grammar> + /// , call<Grammar>(_child) // OK, this works + /// > + /// {}; + /// \endcode + /// + /// The above could also have been written as: + /// + /// \code + /// template<typename Grammar> + /// struct Foo + /// : when< + /// unary_plus<Grammar> + /// , call<Grammar(_child)> // OK, this works, too + /// > + /// {}; + /// \endcode + template<typename PrimitiveTransform> + struct call + : PrimitiveTransform + {}; + + /// \brief A specialization that treats function pointer Transforms as + /// if they were function type Transforms. + /// + /// This specialization requires that \c Fun is actually a function type. + /// + /// This specialization is required for nested transforms such as + /// <tt>call\<T0(T1(_))\></tt>. In C++, functions that are used as + /// parameters to other functions automatically decay to funtion + /// pointer types. In other words, the type <tt>T0(T1(_))</tt> is + /// indistinguishable from <tt>T0(T1(*)(_))</tt>. This specialization + /// is required to handle these nested function pointer type transforms + /// properly. + template<typename Fun> + struct call<Fun *> + : call<Fun> + {}; + + /// INTERNAL ONLY + template<typename Fun> + struct call<detail::msvc_fun_workaround<Fun> > + : call<Fun> + {}; + + /// \brief Either call the PolymorphicFunctionObject with 0 + /// arguments, or invoke the PrimitiveTransform with 3 + /// arguments. + template<typename Fun> + struct call<Fun()> : transform<call<Fun()> > + { + /// INTERNAL ONLY + template<typename Expr, typename State, typename Data, bool B> + struct impl2 + : transform_impl<Expr, State, Data> + { + typedef typename BOOST_PROTO_RESULT_OF<Fun()>::type result_type; + + BOOST_FORCEINLINE + result_type operator()( + typename impl2::expr_param + , typename impl2::state_param + , typename impl2::data_param + ) const + { + return Fun()(); + } + }; + + /// INTERNAL ONLY + template<typename Expr, typename State, typename Data> + struct impl2<Expr, State, Data, true> + : Fun::template impl<Expr, State, Data> + {}; + + /// Either call the PolymorphicFunctionObject \c Fun with 0 arguments; or + /// invoke the PrimitiveTransform \c Fun with 3 arguments: the current + /// expression, state, and data. + /// + /// If \c Fun is a nullary PolymorphicFunctionObject, return <tt>Fun()()</tt>. + /// Otherwise, return <tt>Fun()(e, s, d)</tt>. + /// + /// \param e The current expression + /// \param s The current state + /// \param d An arbitrary data + + /// If \c Fun is a nullary PolymorphicFunctionObject, \c type is a typedef + /// for <tt>boost::result_of\<Fun()\>::type</tt>. Otherwise, it is + /// a typedef for <tt>boost::result_of\<Fun(Expr, State, Data)\>::type</tt>. + template<typename Expr, typename State, typename Data> + struct impl + : impl2<Expr, State, Data, detail::is_transform_<Fun>::value> + {}; + }; + + /// \brief Either call the PolymorphicFunctionObject with 1 + /// argument, or invoke the PrimitiveTransform with 3 + /// arguments. + template<typename Fun, typename A0> + struct call<Fun(A0)> : transform<call<Fun(A0)> > + { + template<typename Expr, typename State, typename Data, bool B> + struct impl2 + : transform_impl<Expr, State, Data> + { + typedef typename when<_, A0>::template impl<Expr, State, Data>::result_type a0; + typedef typename detail::poly_function_traits<Fun, Fun(a0)>::result_type result_type; + + BOOST_FORCEINLINE + result_type operator ()( + typename impl2::expr_param e + , typename impl2::state_param s + , typename impl2::data_param d + ) const + { + return typename detail::poly_function_traits<Fun, Fun(a0)>::function_type()( + detail::as_lvalue(typename when<_, A0>::template impl<Expr, State, Data>()(e, s, d)) + ); + } + }; + + template<typename Expr, typename State, typename Data> + struct impl2<Expr, State, Data, true> + : transform_impl<Expr, State, Data> + { + typedef typename when<_, A0>::template impl<Expr, State, Data>::result_type a0; + typedef typename Fun::template impl<a0, State, Data>::result_type result_type; + + BOOST_FORCEINLINE + result_type operator ()( + typename impl2::expr_param e + , typename impl2::state_param s + , typename impl2::data_param d + ) const + { + return typename Fun::template impl<a0, State, Data>()( + typename when<_, A0>::template impl<Expr, State, Data>()(e, s, d) + , s + , d + ); + } + }; + /// Let \c x be <tt>when\<_, A0\>()(e, s, d)</tt> and \c X + /// be the type of \c x. + /// If \c Fun is a unary PolymorphicFunctionObject that accepts \c x, + /// then \c type is a typedef for <tt>boost::result_of\<Fun(X)\>::type</tt>. + /// Otherwise, it is a typedef for <tt>boost::result_of\<Fun(X, State, Data)\>::type</tt>. + + /// Either call the PolymorphicFunctionObject with 1 argument: + /// the result of applying the \c A0 transform; or + /// invoke the PrimitiveTransform with 3 arguments: + /// result of applying the \c A0 transform, the state, and the + /// data. + /// + /// Let \c x be <tt>when\<_, A0\>()(e, s, d)</tt>. + /// If \c Fun is a unary PolymorphicFunctionObject that accepts \c x, + /// then return <tt>Fun()(x)</tt>. Otherwise, return + /// <tt>Fun()(x, s, d)</tt>. + /// + /// \param e The current expression + /// \param s The current state + /// \param d An arbitrary data + template<typename Expr, typename State, typename Data> + struct impl + : impl2<Expr, State, Data, detail::is_transform_<Fun>::value> + {}; + }; + + /// \brief Either call the PolymorphicFunctionObject with 2 + /// arguments, or invoke the PrimitiveTransform with 3 + /// arguments. + template<typename Fun, typename A0, typename A1> + struct call<Fun(A0, A1)> : transform<call<Fun(A0, A1)> > + { + template<typename Expr, typename State, typename Data, bool B> + struct impl2 + : transform_impl<Expr, State, Data> + { + typedef typename when<_, A0>::template impl<Expr, State, Data>::result_type a0; + typedef typename when<_, A1>::template impl<Expr, State, Data>::result_type a1; + typedef typename detail::poly_function_traits<Fun, Fun(a0, a1)>::result_type result_type; + + BOOST_FORCEINLINE + result_type operator ()( + typename impl2::expr_param e + , typename impl2::state_param s + , typename impl2::data_param d + ) const + { + return typename detail::poly_function_traits<Fun, Fun(a0, a1)>::function_type()( + detail::as_lvalue(typename when<_, A0>::template impl<Expr, State, Data>()(e, s, d)) + , detail::as_lvalue(typename when<_, A1>::template impl<Expr, State, Data>()(e, s, d)) + ); + } + }; + + template<typename Expr, typename State, typename Data> + struct impl2<Expr, State, Data, true> + : transform_impl<Expr, State, Data> + { + typedef typename when<_, A0>::template impl<Expr, State, Data>::result_type a0; + typedef typename when<_, A1>::template impl<Expr, State, Data>::result_type a1; + typedef typename Fun::template impl<a0, a1, Data>::result_type result_type; + + BOOST_FORCEINLINE + result_type operator ()( + typename impl2::expr_param e + , typename impl2::state_param s + , typename impl2::data_param d + ) const + { + return typename Fun::template impl<a0, a1, Data>()( + typename when<_, A0>::template impl<Expr, State, Data>()(e, s, d) + , typename when<_, A1>::template impl<Expr, State, Data>()(e, s, d) + , d + ); + } + }; + + /// Let \c x be <tt>when\<_, A0\>()(e, s, d)</tt> and \c X + /// be the type of \c x. + /// Let \c y be <tt>when\<_, A1\>()(e, s, d)</tt> and \c Y + /// be the type of \c y. + /// If \c Fun is a binary PolymorphicFunction object that accepts \c x + /// and \c y, then \c type is a typedef for + /// <tt>boost::result_of\<Fun(X, Y)\>::type</tt>. Otherwise, it is + /// a typedef for <tt>boost::result_of\<Fun(X, Y, Data)\>::type</tt>. + + /// Either call the PolymorphicFunctionObject with 2 arguments: + /// the result of applying the \c A0 transform, and the + /// result of applying the \c A1 transform; or invoke the + /// PrimitiveTransform with 3 arguments: the result of applying + /// the \c A0 transform, the result of applying the \c A1 + /// transform, and the data. + /// + /// Let \c x be <tt>when\<_, A0\>()(e, s, d)</tt>. + /// Let \c y be <tt>when\<_, A1\>()(e, s, d)</tt>. + /// If \c Fun is a binary PolymorphicFunction object that accepts \c x + /// and \c y, return <tt>Fun()(x, y)</tt>. Otherwise, return + /// <tt>Fun()(x, y, d)</tt>. + /// + /// \param e The current expression + /// \param s The current state + /// \param d An arbitrary data + template<typename Expr, typename State, typename Data> + struct impl + : impl2<Expr, State, Data, detail::is_transform_<Fun>::value> + {}; + }; + + /// \brief Call the PolymorphicFunctionObject or the + /// PrimitiveTransform with the current expression, state + /// and data, transformed according to \c A0, \c A1, and + /// \c A2, respectively. + template<typename Fun, typename A0, typename A1, typename A2> + struct call<Fun(A0, A1, A2)> : transform<call<Fun(A0, A1, A2)> > + { + template<typename Expr, typename State, typename Data, bool B> + struct impl2 + : transform_impl<Expr, State, Data> + { + typedef typename when<_, A0>::template impl<Expr, State, Data>::result_type a0; + typedef typename when<_, A1>::template impl<Expr, State, Data>::result_type a1; + typedef typename when<_, A2>::template impl<Expr, State, Data>::result_type a2; + typedef typename detail::poly_function_traits<Fun, Fun(a0, a1, a2)>::result_type result_type; + + BOOST_FORCEINLINE + result_type operator ()( + typename impl2::expr_param e + , typename impl2::state_param s + , typename impl2::data_param d + ) const + { + return typename detail::poly_function_traits<Fun, Fun(a0, a1, a2)>::function_type()( + detail::as_lvalue(typename when<_, A0>::template impl<Expr, State, Data>()(e, s, d)) + , detail::as_lvalue(typename when<_, A1>::template impl<Expr, State, Data>()(e, s, d)) + , detail::as_lvalue(typename when<_, A2>::template impl<Expr, State, Data>()(e, s, d)) + ); + } + }; + + template<typename Expr, typename State, typename Data> + struct impl2<Expr, State, Data, true> + : transform_impl<Expr, State, Data> + { + typedef typename when<_, A0>::template impl<Expr, State, Data>::result_type a0; + typedef typename when<_, A1>::template impl<Expr, State, Data>::result_type a1; + typedef typename when<_, A2>::template impl<Expr, State, Data>::result_type a2; + typedef typename Fun::template impl<a0, a1, a2>::result_type result_type; + + BOOST_FORCEINLINE + result_type operator ()( + typename impl2::expr_param e + , typename impl2::state_param s + , typename impl2::data_param d + ) const + { + return typename Fun::template impl<a0, a1, a2>()( + typename when<_, A0>::template impl<Expr, State, Data>()(e, s, d) + , typename when<_, A1>::template impl<Expr, State, Data>()(e, s, d) + , typename when<_, A2>::template impl<Expr, State, Data>()(e, s, d) + ); + } + }; + + /// Let \c x be <tt>when\<_, A0\>()(e, s, d)</tt>. + /// Let \c y be <tt>when\<_, A1\>()(e, s, d)</tt>. + /// Let \c z be <tt>when\<_, A2\>()(e, s, d)</tt>. + /// Return <tt>Fun()(x, y, z)</tt>. + /// + /// \param e The current expression + /// \param s The current state + /// \param d An arbitrary data + + template<typename Expr, typename State, typename Data> + struct impl + : impl2<Expr, State, Data, detail::is_transform_<Fun>::value> + {}; + }; + + #include <boost/proto/transform/detail/call.hpp> + + /// INTERNAL ONLY + /// + template<typename Fun> + struct is_callable<call<Fun> > + : mpl::true_ + {}; + +}} // namespace boost::proto + +#if defined(_MSC_VER) && (_MSC_VER >= 1020) +# pragma warning(pop) +#endif + +#endif