/usr/include/boost/proto/transform/arg.hpp is in libboost1.55-dev 1.55.0+dfsg-3.
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/// \file arg.hpp
/// Contains definition of the argN transforms.
//
// 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_ARG_HPP_EAN_11_01_2007
#define BOOST_PROTO_TRANSFORM_ARG_HPP_EAN_11_01_2007
#include <boost/mpl/if.hpp>
#include <boost/proto/proto_fwd.hpp>
#include <boost/proto/traits.hpp>
#include <boost/proto/transform/impl.hpp>
#include <boost/type_traits/is_array.hpp>
#include <boost/proto/transform/env.hpp>
namespace boost { namespace proto
{
/// \brief A PrimitiveTransform that returns the current expression
/// unmodified
///
/// Example:
///
/// \code
/// proto::terminal<int>::type i = {42};
/// proto::terminal<int>::type & j = proto::_expr()(i);
/// assert( boost::addressof(i) == boost::addressof(j) );
/// \endcode
struct _expr : transform<_expr>
{
template<typename Expr, typename State, typename Data>
struct impl : transform_impl<Expr, State, Data>
{
typedef Expr result_type;
/// Returns the current expression.
/// \param e The current expression.
/// \return \c e
/// \throw nothrow
BOOST_PROTO_RETURN_TYPE_STRICT_LOOSE(result_type, typename impl::expr_param)
operator()(
typename impl::expr_param e
, typename impl::state_param
, typename impl::data_param
) const
{
return e;
}
};
};
/// \brief A PrimitiveTransform that returns the current state
/// unmodified
///
/// Example:
///
/// \code
/// proto::terminal<int>::type i = {42};
/// char ch = proto::_state()(i, 'a');
/// assert( ch == 'a' );
/// \endcode
struct _state : transform<_state>
{
template<typename Expr, typename State, typename Data>
struct impl : transform_impl<Expr, State, Data>
{
typedef State result_type;
/// Returns the current state.
/// \param s The current state.
/// \return \c s
/// \throw nothrow
BOOST_PROTO_RETURN_TYPE_STRICT_LOOSE(result_type, typename impl::state_param)
operator ()(
typename impl::expr_param
, typename impl::state_param s
, typename impl::data_param
) const
{
return s;
}
};
};
/// \brief A PrimitiveTransform that returns the current data
/// unmodified
///
/// Example:
///
/// \code
/// proto::terminal<int>::type i = {42};
/// std::string str("hello");
/// std::string & data = proto::_data()(i, 'a', str);
/// assert( &str == &data );
/// \endcode
struct _data : transform<_data>
{
template<typename Expr, typename State, typename Data>
struct impl
: mpl::if_c<
is_env<Data>::value
, _env_var<data_type>
, _env
>::type::template impl<Expr, State, Data>
{};
};
/// \brief A PrimitiveTransform that returns N-th child of the current
/// expression.
///
/// Example:
///
/// \code
/// proto::terminal<int>::type i = {42};
/// proto::terminal<int>::type & j = proto::_child_c<0>()(-i);
/// assert( boost::addressof(i) == boost::addressof(j) );
/// \endcode
template<int N>
struct _child_c : transform<_child_c<N> >
{
template<typename Expr, typename State, typename Data>
struct impl : transform_impl<Expr, State, Data>
{
typedef
typename result_of::child_c<Expr, N>::type
result_type;
/// Returns the N-th child of \c e
/// \pre <tt>arity_of\<Expr\>::value \> N</tt>
/// \param e The current expression.
/// \return <tt>proto::child_c\<N\>(e)</tt>
/// \throw nothrow
#ifdef BOOST_PROTO_STRICT_RESULT_OF
result_type
#else
typename result_of::child_c<typename impl::expr_param, N>::type
#endif
operator ()(
typename impl::expr_param e
, typename impl::state_param
, typename impl::data_param
) const
{
return proto::child_c<N>(e);
}
};
};
/// \brief A PrimitiveTransform that returns the value of the
/// current terminal expression.
///
/// Example:
///
/// \code
/// proto::terminal<int>::type i = {42};
/// int j = proto::_value()(i);
/// assert( 42 == j );
/// \endcode
struct _value : transform<_value>
{
template<typename Expr, typename State, typename Data>
struct impl : transform_impl<Expr, State, Data>
{
typedef
typename result_of::value<Expr>::type
result_type;
/// Returns the value of the specified terminal expression.
/// \pre <tt>arity_of\<Expr\>::value == 0</tt>.
/// \param e The current expression.
/// \return <tt>proto::value(e)</tt>
/// \throw nothrow
#ifdef BOOST_PROTO_STRICT_RESULT_OF
typename mpl::if_c<is_array<result_type>::value, result_type &, result_type>::type
#else
typename result_of::value<typename impl::expr_param>::type
#endif
operator ()(
typename impl::expr_param e
, typename impl::state_param
, typename impl::data_param
) const
{
return proto::value(e);
}
};
};
/// \brief A PrimitiveTransform that does nothing
/// and returns void.
struct _void : transform<_void>
{
template<typename Expr, typename State, typename Data>
struct impl : transform_impl<Expr, State, Data>
{
typedef void result_type;
/// Does nothing and returns void
void operator ()(
typename impl::expr_param
, typename impl::state_param
, typename impl::data_param
) const
{}
};
};
/// \brief A unary CallableTransform that wraps its argument
/// in a \c boost::reference_wrapper\<\>.
///
/// Example:
///
/// \code
/// proto::terminal<int>::type i = {42};
/// boost::reference_wrapper<proto::terminal<int>::type> j
/// = proto::when<_, proto::_byref(_)>()(i);
/// assert( boost::addressof(i) == boost::addressof(j.get()) );
/// \endcode
struct _byref : callable
{
template<typename Sig>
struct result;
template<typename This, typename T>
struct result<This(T)>
{
typedef boost::reference_wrapper<T const> const type;
};
template<typename This, typename T>
struct result<This(T &)>
{
typedef boost::reference_wrapper<T> const type;
};
/// Wrap the parameter \c t in a \c boost::reference_wrapper\<\>
/// \param t The object to wrap
/// \return <tt>boost::ref(t)</tt>
/// \throw nothrow
template<typename T>
boost::reference_wrapper<T> const operator ()(T &t) const
{
return boost::reference_wrapper<T>(t);
}
/// \overload
///
template<typename T>
boost::reference_wrapper<T const> const operator ()(T const &t) const
{
return boost::reference_wrapper<T const>(t);
}
};
/// \brief A unary CallableTransform that strips references
/// and \c boost::reference_wrapper\<\> from its argument.
///
/// Example:
///
/// \code
/// proto::terminal<int>::type i = {42};
/// int j = 67;
/// int k = proto::when<_, proto::_byval(proto::_state)>()(i, boost::ref(j));
/// assert( 67 == k );
/// \endcode
struct _byval : callable
{
template<typename Sig>
struct result;
template<typename This, typename T>
struct result<This(T)>
{
typedef T type;
};
template<typename This, typename T>
struct result<This(T &)>
: result<This(T)>
{};
template<typename This, typename T>
struct result<This(boost::reference_wrapper<T>)>
: result<This(T)>
{};
/// \param t The object to unref
/// \return <tt>t</tt>
/// \throw nothrow
template<typename T>
T operator ()(T const &t) const
{
return t;
}
/// \overload
///
template<typename T>
T operator ()(boost::reference_wrapper<T> const &t) const
{
return t;
}
};
/// INTERNAL ONLY
///
template<>
struct is_callable<_expr>
: mpl::true_
{};
/// INTERNAL ONLY
///
template<>
struct is_callable<_state>
: mpl::true_
{};
/// INTERNAL ONLY
///
template<>
struct is_callable<_data>
: mpl::true_
{};
/// INTERNAL ONLY
///
template<int N>
struct is_callable<_child_c<N> >
: mpl::true_
{};
/// INTERNAL ONLY
///
template<>
struct is_callable<_value>
: mpl::true_
{};
/// INTERNAL ONLY
///
template<>
struct is_callable<_byref>
: mpl::true_
{};
/// INTERNAL ONLY
///
template<>
struct is_callable<_byval>
: mpl::true_
{};
}}
#endif
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