valarray_meta.h

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    typedef typename _Op::result_type value_type;
    
    _BinBase (const _FirstArg& __e1, const _SecondArg& __e2)
            : _M_expr1 (__e1), _M_expr2 (__e2) {}
    value_type operator[] (size_t) const;
    size_t size () const { return _M_expr1.size (); }
    
private:
    const _FirstArg& _M_expr1;
    const _SecondArg& _M_expr2;
};

template<template<class> class _Oper, typename _FirstArg, typename _SecondArg>
inline typename _BinBase<_Oper,_FirstArg,_SecondArg>::value_type
_BinBase<_Oper,_FirstArg,_SecondArg>::operator[] (size_t __i) const
{ return _Op() (_M_expr1[__i], _M_expr2[__i]); }


template<template<class> class _Oper, class _Clos>
class _BinBase2 {
public:
        typedef typename _Clos::value_type _Vt;
    typedef _Oper<_Vt> _Op;
    typedef typename _Op::result_type value_type;
    
    _BinBase2 (const _Clos& __e, const _Vt& __t)
            : _M_expr1 (__e), _M_expr2 (__t) {}
    value_type operator[] (size_t) const;
    size_t size () const { return _M_expr1.size (); }
    
private:
    const _Clos& _M_expr1;
    const _Vt& _M_expr2;
};

template<template<class> class _Oper, class _Clos>
inline typename _BinBase2<_Oper,_Clos>::value_type
_BinBase2<_Oper,_Clos>::operator[] (size_t __i) const
{ return _Op() (_M_expr1[__i], _M_expr2); }


template<template<class> class _Oper, class _Clos>
class _BinBase1 {
public:
    typedef typename _Clos::value_type _Vt;
    typedef _Oper<_Vt> _Op;
    typedef typename _Op::result_type value_type;
    
    _BinBase1 (const _Vt& __t, const _Clos& __e)
            : _M_expr1 (__t), _M_expr2 (__e) {}
    value_type operator[] (size_t) const;
    size_t size () const { return _M_expr2.size (); }
    
private:
    const _Vt& _M_expr1;
    const _Clos& _M_expr2;
};

template<template<class> class _Oper, class _Clos>
inline typename
_BinBase1<_Oper,_Clos>::value_type
_BinBase1<_Oper,_Clos>:: operator[] (size_t __i) const
{ return _Op() (_M_expr1, _M_expr2[__i]); }


template<template<class> class _Oper, class _Dom1, class _Dom2>
struct  _BinClos<_Oper, _Expr, _Expr, _Dom1, _Dom2>
    : _BinBase<_Oper,_Dom1,_Dom2> {
    typedef _BinBase<_Oper,_Dom1,_Dom2> _Base;
    typedef typename _Base::value_type value_type;
    
    _BinClos(const _Dom1& __e1, const _Dom2& __e2) : _Base(__e1, __e2) {}
};

template<template<class> class _Oper, typename _Tp>
struct _BinClos<_Oper,_ValArray,_ValArray,_Tp,_Tp>
    : _BinBase<_Oper,valarray<_Tp>,valarray<_Tp> > {
    typedef _BinBase<_Oper,valarray<_Tp>,valarray<_Tp> > _Base;
    typedef _Tp value_type;
    
    _BinClos (const valarray<_Tp>& __v, const valarray<_Tp>& __w)
            : _Base (__v, __w) {}
};

template<template<class> class _Oper, class _Dom>
struct  _BinClos<_Oper,_Expr,_ValArray,_Dom,typename _Dom::value_type>
    : _BinBase<_Oper,_Dom,valarray<typename _Dom::value_type> > {
        typedef typename _Dom::value_type _Tp;
    typedef _BinBase<_Oper,_Dom,valarray<_Tp> > _Base;
    typedef typename _Base::value_type value_type;
    
    _BinClos(const _Dom& __e1, const valarray<_Tp>& __e2)
            : _Base (__e1, __e2) {}
};

template<template<class> class _Oper, class _Dom>
struct  _BinClos<_Oper,_ValArray,_Expr,typename _Dom::value_type,_Dom>
    : _BinBase<_Oper,valarray<typename _Dom::value_type>,_Dom> {
    typedef typename _Dom::value_type _Tp;
    typedef _BinBase<_Oper,valarray<_Tp>,_Dom> _Base;
    typedef typename _Base::value_type value_type;
    
    _BinClos (const valarray<_Tp>& __e1, const _Dom& __e2)
            : _Base (__e1, __e2) {}
};

template<template<class> class _Oper, class _Dom>
struct _BinClos<_Oper,_Expr,_Constant,_Dom,typename _Dom::value_type>
    : _BinBase2<_Oper,_Dom> {
    typedef typename _Dom::value_type _Tp;
    typedef _BinBase2<_Oper,_Dom> _Base;
    typedef typename _Base::value_type value_type;
    
    _BinClos (const _Dom& __e1, const _Tp& __e2) : _Base (__e1, __e2) {}
};

template<template<class> class _Oper, class _Dom>
struct _BinClos<_Oper,_Constant,_Expr,typename _Dom::value_type,_Dom>
    : _BinBase1<_Oper,_Dom> {
    typedef typename _Dom::value_type _Tp;
    typedef _BinBase1<_Oper,_Dom> _Base;
    typedef typename _Base::value_type value_type;
    
    _BinClos (const _Tp& __e1, const _Dom& __e2) : _Base (__e1, __e2) {}
};

template<template<class> class _Oper, typename _Tp>
struct _BinClos<_Oper,_ValArray,_Constant,_Tp,_Tp>
    : _BinBase2<_Oper,valarray<_Tp> > {
    typedef _BinBase2<_Oper,valarray<_Tp> > _Base;
    typedef typename _Base::value_type value_type;
    
    _BinClos (const valarray<_Tp>& __v, const _Tp& __t)
            : _Base (__v, __t) {}
};

template<template<class> class _Oper, typename _Tp>
struct _BinClos<_Oper,_Constant,_ValArray,_Tp,_Tp>
    : _BinBase1<_Oper,valarray<_Tp> > {
    typedef _BinBase1<_Oper,valarray<_Tp> > _Base;
    typedef typename _Base::value_type value_type;
    
    _BinClos (const _Tp& __t, const valarray<_Tp>& __v)
            : _Base (__t, __v) {}
};


//
// slice_array closure.
//
template<typename _Dom>  class _SBase {
public:
    typedef typename _Dom::value_type value_type;
    
    _SBase (const _Dom& __e, const slice& __s)
            : _M_expr (__e), _M_slice (__s) {}
    value_type operator[] (size_t __i) const
    { return _M_expr[_M_slice.start () + __i * _M_slice.stride ()]; }
    size_t size() const { return _M_slice.size (); }
    
private:
    const _Dom& _M_expr;
    const slice& _M_slice;
};

template<typename _Tp> class _SBase<_Array<_Tp> > {
public:
    typedef _Tp value_type;
    
    _SBase (_Array<_Tp> __a, const slice& __s)
            : _M_array (__a._M_data+__s.start()), _M_size (__s.size()),
              _M_stride (__s.stride()) {}
    value_type operator[] (size_t __i) const
    { return _M_array._M_data[__i * _M_stride]; }
    size_t size() const { return _M_size; }
    
private:
    const _Array<_Tp> _M_array;
    const size_t _M_size;
    const size_t _M_stride;
};

template<class _Dom> struct  _SClos<_Expr,_Dom> : _SBase<_Dom> {
    typedef _SBase<_Dom> _Base;
    typedef typename _Base::value_type value_type;
    
    _SClos (const _Dom& __e, const slice& __s) : _Base (__e, __s) {}
};

template<typename _Tp>
struct _SClos<_ValArray,_Tp> : _SBase<_Array<_Tp> > {
    typedef  _SBase<_Array<_Tp> > _Base;
    typedef _Tp value_type;
    
    _SClos (_Array<_Tp> __a, const slice& __s) : _Base (__a, __s) {}
};

//
// gslice_array closure.
//
template<class _Dom> class _GBase {
public:
    typedef typename _Dom::value_type value_type;
    
    _GBase (const _Dom& __e, const valarray<size_t>& __i)
            : _M_expr (__e), _M_index(__i) {}
    value_type operator[] (size_t __i) const
    { return _M_expr[_M_index[__i]]; }
    size_t size () const { return _M_index.size(); }
    
private:
    const _Dom&	 _M_expr;
    const valarray<size_t>& _M_index;
};

template<typename _Tp> class _GBase<_Array<_Tp> > {
public:
    typedef _Tp value_type;
    
    _GBase (_Array<_Tp> __a, const valarray<size_t>& __i)
            : _M_array (__a), _M_index(__i) {}
    value_type operator[] (size_t __i) const
    { return _M_array._M_data[_M_index[__i]]; }
    size_t size () const { return _M_index.size(); }
    
private:
    const _Array<_Tp>     _M_array;
    const valarray<size_t>& _M_index;
};

template<class _Dom> struct _GClos<_Expr,_Dom> : _GBase<_Dom> {
    typedef _GBase<_Dom> _Base;
    typedef typename _Base::value_type value_type;

    _GClos (const _Dom& __e, const valarray<size_t>& __i)
            : _Base (__e, __i) {}
};

template<typename _Tp>
struct _GClos<_ValArray,_Tp> : _GBase<_Array<_Tp> > {
    typedef _GBase<_Array<_Tp> > _Base;
    typedef typename _Base::value_type value_type;
    
    _GClos (_Array<_Tp> __a, const valarray<size_t>& __i)
            : _Base (__a, __i) {}
};

//
// indirect_array closure
//

template<class _Dom> class _IBase {
public:
    typedef typename _Dom::value_type value_type;

    _IBase (const _Dom& __e, const valarray<size_t>& __i)
            : _M_expr (__e), _M_index (__i) {}
    value_type operator[] (size_t __i) const
    { return _M_expr[_M_index[__i]]; }
    size_t size() const { return _M_index.size(); }
    
private:
    const _Dom& 	    _M_expr;
    const valarray<size_t>& _M_index;
};

template<class _Dom> struct _IClos<_Expr,_Dom> : _IBase<_Dom> {
    typedef _IBase<_Dom> _Base;
    typedef typename _Base::value_type value_type;
    
    _IClos (const _Dom& __e, const valarray<size_t>& __i)
            : _Base (__e, __i) {}
};

template<typename _Tp>
struct _IClos<_ValArray,_Tp>  : _IBase<valarray<_Tp> > {
    typedef _IBase<valarray<_Tp> > _Base;
    typedef _Tp value_type;
    
    _IClos (const valarray<_Tp>& __a, const valarray<size_t>& __i)
            : _Base (__a, __i) {}
};

//
// class _Expr
//      
template<class _Clos, typename _Tp> class _Expr {
public:
    typedef _Tp value_type;
    
    _Expr (const _Clos&);
    
    const _Clos& operator() () const;
    
    value_type operator[] (size_t) const;
    valarray<value_type> operator[] (slice) const;
    valarray<value_type> operator[] (const gslice&) const;
    valarray<value_type> operator[] (const valarray<bool>&) const;
    valarray<value_type> operator[] (const valarray<size_t>&) const;
    
    _Expr<_UnClos<_Unary_plus,_Expr,_Clos>, value_type>
    operator+ () const;
    
    _Expr<_UnClos<negate,_Expr,_Clos>, value_type>
    operator- () const;
    
    _Expr<_UnClos<_Bitwise_not,_Expr,_Clos>, value_type>
    operator~ () const;
    
    _Expr<_UnClos<logical_not,_Expr,_Clos>, bool>
    operator! () const;
    
    size_t size () const;
    value_type sum () const;
    
    valarray<value_type> shift (int) const;
    valarray<value_type> cshift (int) const;
//     _Meta<_ApplyFunctionWithValue<_Expr>, value_type>
//     apply (value_type _M_func (value_type)) const;
//     _Meta<_ApplyFunctionWithConstRef<_Expr>, value_type>
//     apply (value_type _M_func (const value_type&)) const;
        
private:
    const _Clos _M_closure;
};
    
template<class _Clos, typename _Tp>
inline
_Expr<_Clos,_Tp>::_Expr (const _Clos& __c) : _M_closure(__c) {}

template<class _Clos, typename _Tp>
inline const _Clos&
_Expr<_Clos,_Tp>::operator() () const
{ return _M_closure; }

template<class _Clos, typename _Tp>
inline _Tp
_Expr<_Clos,_Tp>::operator[] (size_t __i) const
{ return _M_closure[__i]; }

template<class _Clos, typename _Tp>
inline valarray<_Tp>
_Expr<_Clos,_Tp>::operator[] (slice __s) const
{ return _M_closure[__s]; }

template<class _Clos, typename _Tp>
inline valarray<_Tp>
_Expr<_Clos,_Tp>::operator[] (const gslice& __gs) const
{ return _M_closure[__gs]; }