471 lines
15 KiB
C++
471 lines
15 KiB
C++
///////////////////////////////////////////////////////////////////////////////
|
|
/// \file generate.hpp
|
|
/// Contains definition of generate\<\> class template, which end users can
|
|
/// specialize for generating domain-specific expression wrappers.
|
|
//
|
|
// 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_GENERATE_HPP_EAN_02_13_2007
|
|
#define BOOST_PROTO_GENERATE_HPP_EAN_02_13_2007
|
|
|
|
#include <boost/config.hpp>
|
|
#include <boost/version.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_binary_params.hpp>
|
|
#include <boost/preprocessor/repetition/enum_trailing_params.hpp>
|
|
#include <boost/mpl/bool.hpp>
|
|
#include <boost/utility/enable_if.hpp>
|
|
#include <boost/utility/result_of.hpp>
|
|
#include <boost/proto/proto_fwd.hpp>
|
|
#include <boost/proto/args.hpp>
|
|
|
|
#if defined(_MSC_VER)
|
|
# pragma warning(push)
|
|
# pragma warning(disable : 4714) // function 'xxx' marked as __forceinline not inlined
|
|
#endif
|
|
|
|
namespace boost { namespace proto
|
|
{
|
|
|
|
namespace detail
|
|
{
|
|
template<typename Expr>
|
|
struct by_value_generator_;
|
|
|
|
template<typename Tag, typename Arg>
|
|
struct by_value_generator_<proto::expr<Tag, term<Arg>, 0> >
|
|
{
|
|
typedef
|
|
proto::expr<
|
|
Tag
|
|
, term<typename detail::term_traits<Arg>::value_type>
|
|
, 0
|
|
>
|
|
type;
|
|
|
|
BOOST_FORCEINLINE
|
|
static type const call(proto::expr<Tag, term<Arg>, 0> const &e)
|
|
{
|
|
type that = {e.child0};
|
|
return that;
|
|
}
|
|
};
|
|
|
|
template<typename Tag, typename Arg>
|
|
struct by_value_generator_<proto::basic_expr<Tag, term<Arg>, 0> >
|
|
{
|
|
typedef
|
|
proto::basic_expr<
|
|
Tag
|
|
, term<typename detail::term_traits<Arg>::value_type>
|
|
, 0
|
|
>
|
|
type;
|
|
|
|
BOOST_FORCEINLINE
|
|
static type const call(proto::basic_expr<Tag, term<Arg>, 0> const &e)
|
|
{
|
|
type that = {e.child0};
|
|
return that;
|
|
}
|
|
};
|
|
|
|
// Include the other specializations of by_value_generator_
|
|
#include <boost/proto/detail/generate_by_value.hpp>
|
|
}
|
|
|
|
/// \brief Annotate a generator to indicate that it would
|
|
/// prefer to be passed instances of \c proto::basic_expr\<\> rather
|
|
/// than \c proto::expr\<\>. <tt>use_basic_expr\<Generator\></tt> is
|
|
/// itself a generator.
|
|
///
|
|
template<typename Generator>
|
|
struct use_basic_expr
|
|
: Generator
|
|
{
|
|
BOOST_PROTO_USE_BASIC_EXPR()
|
|
};
|
|
|
|
/// \brief A simple generator that passes an expression
|
|
/// through unchanged.
|
|
///
|
|
/// Generators are intended for use as the first template parameter
|
|
/// to the \c domain\<\> class template and control if and how
|
|
/// expressions within that domain are to be customized.
|
|
/// The \c default_generator makes no modifications to the expressions
|
|
/// passed to it.
|
|
struct default_generator
|
|
{
|
|
BOOST_PROTO_CALLABLE()
|
|
|
|
template<typename Sig>
|
|
struct result;
|
|
|
|
template<typename This, typename Expr>
|
|
struct result<This(Expr)>
|
|
{
|
|
typedef Expr type;
|
|
};
|
|
|
|
/// \param expr A Proto expression
|
|
/// \return expr
|
|
template<typename Expr>
|
|
BOOST_FORCEINLINE
|
|
BOOST_PROTO_RETURN_TYPE_STRICT_LOOSE(Expr, Expr const &)
|
|
operator ()(Expr const &e) const
|
|
{
|
|
return e;
|
|
}
|
|
};
|
|
|
|
/// \brief A simple generator that passes an expression
|
|
/// through unchanged and specifies a preference for
|
|
/// \c proto::basic_expr\<\> over \c proto::expr\<\>.
|
|
///
|
|
/// Generators are intended for use as the first template parameter
|
|
/// to the \c domain\<\> class template and control if and how
|
|
/// expressions within that domain are to be customized.
|
|
/// The \c default_generator makes no modifications to the expressions
|
|
/// passed to it.
|
|
struct basic_default_generator
|
|
: proto::use_basic_expr<default_generator>
|
|
{};
|
|
|
|
/// \brief A generator that wraps expressions passed
|
|
/// to it in the specified extension wrapper.
|
|
///
|
|
/// Generators are intended for use as the first template parameter
|
|
/// to the \c domain\<\> class template and control if and how
|
|
/// expressions within that domain are to be customized.
|
|
/// \c generator\<\> wraps each expression passed to it in
|
|
/// the \c Extends\<\> wrapper.
|
|
template<template<typename> class Extends>
|
|
struct generator
|
|
{
|
|
BOOST_PROTO_CALLABLE()
|
|
BOOST_PROTO_USE_BASIC_EXPR()
|
|
|
|
template<typename Sig>
|
|
struct result;
|
|
|
|
template<typename This, typename Expr>
|
|
struct result<This(Expr)>
|
|
{
|
|
typedef Extends<Expr> type;
|
|
};
|
|
|
|
template<typename This, typename Expr>
|
|
struct result<This(Expr &)>
|
|
{
|
|
typedef Extends<Expr> type;
|
|
};
|
|
|
|
template<typename This, typename Expr>
|
|
struct result<This(Expr const &)>
|
|
{
|
|
typedef Extends<Expr> type;
|
|
};
|
|
|
|
/// \param expr A Proto expression
|
|
/// \return Extends<Expr>(expr)
|
|
template<typename Expr>
|
|
BOOST_FORCEINLINE
|
|
Extends<Expr> operator ()(Expr const &e) const
|
|
{
|
|
return Extends<Expr>(e);
|
|
}
|
|
};
|
|
|
|
/// \brief A generator that wraps expressions passed
|
|
/// to it in the specified extension wrapper and uses
|
|
/// aggregate initialization for the wrapper.
|
|
///
|
|
/// Generators are intended for use as the first template parameter
|
|
/// to the \c domain\<\> class template and control if and how
|
|
/// expressions within that domain are to be customized.
|
|
/// \c pod_generator\<\> wraps each expression passed to it in
|
|
/// the \c Extends\<\> wrapper, and uses aggregate initialzation
|
|
/// for the wrapped object.
|
|
template<template<typename> class Extends>
|
|
struct pod_generator
|
|
{
|
|
BOOST_PROTO_CALLABLE()
|
|
BOOST_PROTO_USE_BASIC_EXPR()
|
|
|
|
template<typename Sig>
|
|
struct result;
|
|
|
|
template<typename This, typename Expr>
|
|
struct result<This(Expr)>
|
|
{
|
|
typedef Extends<Expr> type;
|
|
};
|
|
|
|
template<typename This, typename Expr>
|
|
struct result<This(Expr &)>
|
|
{
|
|
typedef Extends<Expr> type;
|
|
};
|
|
|
|
template<typename This, typename Expr>
|
|
struct result<This(Expr const &)>
|
|
{
|
|
typedef Extends<Expr> type;
|
|
};
|
|
|
|
/// \param expr The expression to wrap
|
|
/// \return <tt>Extends\<Expr\> that = {expr}; return that;</tt>
|
|
template<typename Expr>
|
|
BOOST_FORCEINLINE
|
|
Extends<Expr> operator ()(Expr const &e) const
|
|
{
|
|
Extends<Expr> that = {e};
|
|
return that;
|
|
}
|
|
|
|
// Work-around for:
|
|
// https://connect.microsoft.com/VisualStudio/feedback/details/765449/codegen-stack-corruption-using-runtime-checks-when-aggregate-initializing-struct
|
|
#if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1700))
|
|
template<typename Class, typename Member>
|
|
BOOST_FORCEINLINE
|
|
Extends<expr<tag::terminal, proto::term<Member Class::*> > > operator ()(expr<tag::terminal, proto::term<Member Class::*> > const &e) const
|
|
{
|
|
Extends<expr<tag::terminal, proto::term<Member Class::*> > > that;
|
|
proto::value(that.proto_expr_) = proto::value(e);
|
|
return that;
|
|
}
|
|
|
|
template<typename Class, typename Member>
|
|
BOOST_FORCEINLINE
|
|
Extends<basic_expr<tag::terminal, proto::term<Member Class::*> > > operator ()(basic_expr<tag::terminal, proto::term<Member Class::*> > const &e) const
|
|
{
|
|
Extends<basic_expr<tag::terminal, proto::term<Member Class::*> > > that;
|
|
proto::value(that.proto_expr_) = proto::value(e);
|
|
return that;
|
|
}
|
|
#endif
|
|
};
|
|
|
|
/// \brief A generator that replaces child nodes held by
|
|
/// reference with ones held by value. Use with
|
|
/// \c compose_generators to forward that result to another
|
|
/// generator.
|
|
///
|
|
/// Generators are intended for use as the first template parameter
|
|
/// to the \c domain\<\> class template and control if and how
|
|
/// expressions within that domain are to be customized.
|
|
/// \c by_value_generator ensures all child nodes are
|
|
/// held by value. This generator is typically composed with a
|
|
/// second generator for further processing, as
|
|
/// <tt>compose_generators\<by_value_generator, MyGenerator\></tt>.
|
|
struct by_value_generator
|
|
{
|
|
BOOST_PROTO_CALLABLE()
|
|
|
|
template<typename Sig>
|
|
struct result;
|
|
|
|
template<typename This, typename Expr>
|
|
struct result<This(Expr)>
|
|
{
|
|
typedef
|
|
typename detail::by_value_generator_<Expr>::type
|
|
type;
|
|
};
|
|
|
|
template<typename This, typename Expr>
|
|
struct result<This(Expr &)>
|
|
{
|
|
typedef
|
|
typename detail::by_value_generator_<Expr>::type
|
|
type;
|
|
};
|
|
|
|
template<typename This, typename Expr>
|
|
struct result<This(Expr const &)>
|
|
{
|
|
typedef
|
|
typename detail::by_value_generator_<Expr>::type
|
|
type;
|
|
};
|
|
|
|
/// \param expr The expression to modify.
|
|
/// \return <tt>deep_copy(expr)</tt>
|
|
template<typename Expr>
|
|
BOOST_FORCEINLINE
|
|
typename result<by_value_generator(Expr)>::type operator ()(Expr const &e) const
|
|
{
|
|
return detail::by_value_generator_<Expr>::call(e);
|
|
}
|
|
};
|
|
|
|
/// \brief A composite generator that first applies one
|
|
/// transform to an expression and then forwards the result
|
|
/// on to another generator for further transformation.
|
|
///
|
|
/// Generators are intended for use as the first template parameter
|
|
/// to the \c domain\<\> class template and control if and how
|
|
/// expressions within that domain are to be customized.
|
|
/// \c compose_generators\<\> is a composite generator that first
|
|
/// applies one transform to an expression and then forwards the
|
|
/// result on to another generator for further transformation.
|
|
template<typename First, typename Second>
|
|
struct compose_generators
|
|
{
|
|
BOOST_PROTO_CALLABLE()
|
|
|
|
template<typename Sig>
|
|
struct result;
|
|
|
|
template<typename This, typename Expr>
|
|
struct result<This(Expr)>
|
|
{
|
|
typedef
|
|
typename Second::template result<
|
|
Second(typename First::template result<First(Expr)>::type)
|
|
>::type
|
|
type;
|
|
};
|
|
|
|
template<typename This, typename Expr>
|
|
struct result<This(Expr &)>
|
|
{
|
|
typedef
|
|
typename Second::template result<
|
|
Second(typename First::template result<First(Expr)>::type)
|
|
>::type
|
|
type;
|
|
};
|
|
|
|
template<typename This, typename Expr>
|
|
struct result<This(Expr const &)>
|
|
{
|
|
typedef
|
|
typename Second::template result<
|
|
Second(typename First::template result<First(Expr)>::type)
|
|
>::type
|
|
type;
|
|
};
|
|
|
|
/// \param expr The expression to modify.
|
|
/// \return Second()(First()(expr))
|
|
template<typename Expr>
|
|
BOOST_FORCEINLINE
|
|
typename result<compose_generators(Expr)>::type operator ()(Expr const &e) const
|
|
{
|
|
return Second()(First()(e));
|
|
}
|
|
};
|
|
|
|
/// \brief Tests a generator to see whether it would prefer
|
|
/// to be passed instances of \c proto::basic_expr\<\> rather than
|
|
/// \c proto::expr\<\>.
|
|
///
|
|
template<typename Generator, typename Void>
|
|
struct wants_basic_expr
|
|
: mpl::false_
|
|
{};
|
|
|
|
template<typename Generator>
|
|
struct wants_basic_expr<Generator, typename Generator::proto_use_basic_expr_>
|
|
: mpl::true_
|
|
{};
|
|
|
|
/// INTERNAL ONLY
|
|
template<>
|
|
struct is_callable<default_generator>
|
|
: mpl::true_
|
|
{};
|
|
|
|
/// INTERNAL ONLY
|
|
template<template<typename> class Extends>
|
|
struct is_callable<generator<Extends> >
|
|
: mpl::true_
|
|
{};
|
|
|
|
/// INTERNAL ONLY
|
|
template<template<typename> class Extends>
|
|
struct is_callable<pod_generator<Extends> >
|
|
: mpl::true_
|
|
{};
|
|
|
|
/// INTERNAL ONLY
|
|
template<>
|
|
struct is_callable<by_value_generator>
|
|
: mpl::true_
|
|
{};
|
|
|
|
/// INTERNAL ONLY
|
|
template<typename First, typename Second>
|
|
struct is_callable<compose_generators<First, Second> >
|
|
: mpl::true_
|
|
{};
|
|
|
|
}}
|
|
|
|
// Specializations of boost::result_of and boost::tr1_result_of to eliminate
|
|
// some unnecessary template instantiations
|
|
namespace boost
|
|
{
|
|
template<typename Expr>
|
|
struct result_of<proto::default_domain(Expr)>
|
|
{
|
|
typedef Expr type;
|
|
};
|
|
|
|
template<typename Expr>
|
|
struct result_of<proto::basic_default_domain(Expr)>
|
|
{
|
|
typedef Expr type;
|
|
};
|
|
|
|
template<typename Expr>
|
|
struct result_of<proto::default_generator(Expr)>
|
|
{
|
|
typedef Expr type;
|
|
};
|
|
|
|
template<typename Expr>
|
|
struct result_of<proto::basic_default_generator(Expr)>
|
|
{
|
|
typedef Expr type;
|
|
};
|
|
|
|
#if BOOST_VERSION >= 104400
|
|
template<typename Expr>
|
|
struct tr1_result_of<proto::default_domain(Expr)>
|
|
{
|
|
typedef Expr type;
|
|
};
|
|
|
|
template<typename Expr>
|
|
struct tr1_result_of<proto::basic_default_domain(Expr)>
|
|
{
|
|
typedef Expr type;
|
|
};
|
|
|
|
template<typename Expr>
|
|
struct tr1_result_of<proto::default_generator(Expr)>
|
|
{
|
|
typedef Expr type;
|
|
};
|
|
|
|
template<typename Expr>
|
|
struct tr1_result_of<proto::basic_default_generator(Expr)>
|
|
{
|
|
typedef Expr type;
|
|
};
|
|
#endif
|
|
}
|
|
|
|
#if defined(_MSC_VER)
|
|
# pragma warning(pop)
|
|
#endif
|
|
|
|
#endif // BOOST_PROTO_GENERATE_HPP_EAN_02_13_2007
|