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/*=============================================================================
Copyright (c) 1998-2003 Joel de Guzman
http://spirit.sourceforge.net/
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)
=============================================================================*/
#if !defined(BOOST_SPIRIT_COMPOSITE_HPP)
#define BOOST_SPIRIT_COMPOSITE_HPP
///////////////////////////////////////////////////////////////////////////////
#include <boost/compressed_pair.hpp>
#include <boost/spirit/home/classic/namespace.hpp>
///////////////////////////////////////////////////////////////////////////////
namespace boost { namespace spirit {
BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
#pragma warning(push)
#pragma warning(disable:4512) //assignment operator could not be generated
#endif
///////////////////////////////////////////////////////////////////////////
//
// unary class.
//
// Composite class composed of a single subject. This template class
// is parameterized by the subject type S and a base class to
// inherit from, BaseT. The unary class is meant to be a base class
// to inherit from. The inheritance structure, given the BaseT
// template parameter places the unary class in the middle of a
// linear, single parent hierarchy. For instance, given a class S
// and a base class B, a class D can derive from unary:
//
// struct D : public unary<S, B> {...};
//
// The inheritance structure is thus:
//
// B
// |
// unary (has S)
// |
// D
//
// The subject can be accessed from the derived class D as:
// this->subject();
//
// Typically, the subject S is specified as typename S::embed_t.
// embed_t specifies how the subject is embedded in the composite
// (See parser.hpp for details).
//
///////////////////////////////////////////////////////////////////////////
template <typename S, typename BaseT>
class unary : public BaseT
{
public:
typedef BaseT base_t;
typedef typename boost::call_traits<S>::param_type param_t;
typedef typename boost::call_traits<S>::const_reference return_t;
typedef S subject_t;
typedef typename S::embed_t subject_embed_t;
unary(param_t subj_)
: base_t(), subj(subj_) {}
unary(BaseT const& base, param_t subj_)
: base_t(base), subj(subj_) {}
return_t
subject() const
{ return subj; }
private:
subject_embed_t subj;
};
///////////////////////////////////////////////////////////////////////////
//
// binary class.
//
// Composite class composed of a pair (left and right). This
// template class is parameterized by the left and right subject
// types A and B and a base class to inherit from, BaseT. The binary
// class is meant to be a base class to inherit from. The
// inheritance structure, given the BaseT template parameter places
// the binary class in the middle of a linear, single parent
// hierarchy. For instance, given classes X and Y and a base class
// B, a class D can derive from binary:
//
// struct D : public binary<X, Y, B> {...};
//
// The inheritance structure is thus:
//
// B
// |
// binary (has X and Y)
// |
// D
//
// The left and right subjects can be accessed from the derived
// class D as: this->left(); and this->right();
//
// Typically, the pairs X and Y are specified as typename X::embed_t
// and typename Y::embed_t. embed_t specifies how the subject is
// embedded in the composite (See parser.hpp for details).
//
///////////////////////////////////////////////////////////////////////////////
template <typename A, typename B, typename BaseT>
class binary : public BaseT
{
public:
typedef BaseT base_t;
typedef typename boost::call_traits<A>::param_type left_param_t;
typedef typename boost::call_traits<A>::const_reference left_return_t;
typedef typename boost::call_traits<B>::param_type right_param_t;
typedef typename boost::call_traits<B>::const_reference right_return_t;
typedef A left_t;
typedef typename A::embed_t left_embed_t;
typedef B right_t;
typedef typename B::embed_t right_embed_t;
binary(left_param_t a, right_param_t b)
: base_t(), subj(a, b) {}
left_return_t
left() const
{ return subj.first(); }
right_return_t
right() const
{ return subj.second(); }
private:
boost::compressed_pair<left_embed_t, right_embed_t> subj;
};
#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
#pragma warning(pop)
#endif
BOOST_SPIRIT_CLASSIC_NAMESPACE_END
}} // namespace BOOST_SPIRIT_CLASSIC_NS
#endif
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Swift