valarray_before.h

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        };

    template<typename _Tp>
        struct __fun<__greater, _Tp>
        {
            typedef bool result_type;
        };

    template<typename _Tp>
        struct __fun<__less_equal, _Tp>
        {
            typedef bool result_type;
        };

    template<typename _Tp>
        struct __fun<__greater_equal, _Tp>
        {
            typedef bool result_type;
        };

    template<typename _Tp>
        struct __fun<__equal_to, _Tp>
        {
            typedef bool result_type;
        };

    template<typename _Tp>
        struct __fun<__not_equal_to, _Tp>
        {
            typedef bool result_type;
        };

    //
    // Apply function taking a value/const reference closure
    //

    template<typename _Dom, typename _Arg>
        class _FunBase
        {
            public:
                typedef typename _Dom::value_type value_type;

                _FunBase(const _Dom& __e, value_type __f(_Arg))
                    : _M_expr(__e), _M_func(__f) {}

                value_type operator[](size_t __i) const
                { return _M_func (_M_expr[__i]); }

                size_t size() const { return _M_expr.size ();}

            private:
                const _Dom& _M_expr;
                value_type (*_M_func)(_Arg);
        };

    template<class _Dom>
        struct _ValFunClos<_Expr,_Dom> : _FunBase<_Dom, typename _Dom::value_type>
        {
            typedef _FunBase<_Dom, typename _Dom::value_type> _Base;
            typedef typename _Base::value_type value_type;
            typedef value_type _Tp;

            _ValFunClos(const _Dom& __e, _Tp __f(_Tp)) : _Base(__e, __f) {}
        };

    template<typename _Tp>
        struct _ValFunClos<_ValArray,_Tp> : _FunBase<valarray<_Tp>, _Tp>
        {
            typedef _FunBase<valarray<_Tp>, _Tp> _Base;
            typedef _Tp value_type;

            _ValFunClos(const valarray<_Tp>& __v, _Tp __f(_Tp)) : _Base(__v, __f) {}
        };

    template<class _Dom>
        struct _RefFunClos<_Expr,_Dom> :
        _FunBase<_Dom, const typename _Dom::value_type&>
        {
            typedef _FunBase<_Dom, const typename _Dom::value_type&> _Base;
            typedef typename _Base::value_type value_type;
            typedef value_type _Tp;

            _RefFunClos(const _Dom& __e, _Tp __f(const _Tp&))
                : _Base(__e, __f) {}
        };

    template<typename _Tp>
        struct _RefFunClos<_ValArray,_Tp> : _FunBase<valarray<_Tp>, const _Tp&>
        {
            typedef _FunBase<valarray<_Tp>, const _Tp&> _Base;
            typedef _Tp value_type;

            _RefFunClos(const valarray<_Tp>& __v, _Tp __f(const _Tp&))
                : _Base(__v, __f) {}
        };

    //
    // Unary expression closure.
    //

    template<class _Oper, class _Arg>
        class _UnBase
        {
            public:
                typedef typename _Arg::value_type _Vt;
                typedef typename __fun<_Oper, _Vt>::result_type value_type;

                _UnBase(const _Arg& __e) : _M_expr(__e) {}

                value_type operator[](size_t __i) const
                { return _Oper()(_M_expr[__i]); }

                size_t size() const { return _M_expr.size(); }

            private:
                const _Arg& _M_expr;
        };

    template<class _Oper, class _Dom>
        struct _UnClos<_Oper, _Expr, _Dom> :  _UnBase<_Oper, _Dom>
        {
            typedef _Dom _Arg;
            typedef _UnBase<_Oper, _Dom> _Base;
            typedef typename _Base::value_type value_type;

            _UnClos(const _Arg& __e) : _Base(__e) {}
        };

    template<class _Oper, typename _Tp>
        struct _UnClos<_Oper, _ValArray, _Tp> : _UnBase<_Oper, valarray<_Tp> >
        {
            typedef valarray<_Tp> _Arg;
            typedef _UnBase<_Oper, valarray<_Tp> > _Base;
            typedef typename _Base::value_type value_type;

            _UnClos(const _Arg& __e) : _Base(__e) {}
        };


    //
    // Binary expression closure.
    //

    template<class _Oper, class _FirstArg, class _SecondArg>
        class _BinBase
        {
            public:
                typedef typename _FirstArg::value_type _Vt;
                typedef typename __fun<_Oper, _Vt>::result_type value_type;

                _BinBase(const _FirstArg& __e1, const _SecondArg& __e2)
                    : _M_expr1(__e1), _M_expr2(__e2) {}

                value_type operator[](size_t __i) const
                { return _Oper()(_M_expr1[__i], _M_expr2[__i]); }

                size_t size() const { return _M_expr1.size(); }

            private:
                const _FirstArg& _M_expr1;
                const _SecondArg& _M_expr2;
        };


    template<class _Oper, class _Clos>
        class _BinBase2
        {
            public:
                typedef typename _Clos::value_type _Vt;
                typedef typename __fun<_Oper, _Vt>::result_type value_type;

                _BinBase2(const _Clos& __e, const _Vt& __t)
                    : _M_expr1(__e), _M_expr2(__t) {}

                value_type operator[](size_t __i) const
                { return _Oper()(_M_expr1[__i], _M_expr2); }

                size_t size() const { return _M_expr1.size(); }

            private:
                const _Clos& _M_expr1;
                const _Vt& _M_expr2;
        };

    template<class _Oper, class _Clos>
        class _BinBase1
        {
            public:
                typedef typename _Clos::value_type _Vt;
                typedef typename __fun<_Oper, _Vt>::result_type value_type;

                _BinBase1(const _Vt& __t, const _Clos& __e)
                    : _M_expr1(__t), _M_expr2(__e) {}

                value_type operator[](size_t __i) const
                { return _Oper()(_M_expr1, _M_expr2[__i]); }

                size_t size() const { return _M_expr2.size(); }

            private:
                const _Vt& _M_expr1;
                const _Clos& _M_expr2;
        };

    template<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<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<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<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<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<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<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<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) {}
        };

} // std::


#endif /* _CPP_VALARRAY_BEFORE_H */

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