702 lines
18 KiB
C++
702 lines
18 KiB
C++
// The template and inlines for the -*- C++ -*- internal _Meta class.
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// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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// Written by Gabriel Dos Reis <Gabriel.Dos-Reis@cmla.ens-cachan.fr>
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/** @file valarray_meta.h
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* This is an internal header file, included by other library headers.
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* You should not attempt to use it directly.
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*/
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#ifndef _VALARRAY_BEFORE_H
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#define _VALARRAY_BEFORE_H 1
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#pragma GCC system_header
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#include <bits/slice_array.h>
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namespace std
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{
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//
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// Implementing a loosened valarray return value is tricky.
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// First we need to meet 26.3.1/3: we should not add more than
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// two levels of template nesting. Therefore we resort to template
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// template to "flatten" loosened return value types.
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// At some point we use partial specialization to remove one level
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// template nesting due to _Expr<>
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//
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// This class is NOT defined. It doesn't need to.
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template<typename _Tp1, typename _Tp2> class _Constant;
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// Implementations of unary functions applied to valarray<>s.
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// I use hard-coded object functions here instead of a generic
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// approach like pointers to function:
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// 1) correctness: some functions take references, others values.
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// we can't deduce the correct type afterwards.
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// 2) efficiency -- object functions can be easily inlined
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// 3) be Koenig-lookup-friendly
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struct __abs
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __t) const { return abs(__t); }
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};
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struct __cos
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __t) const { return cos(__t); }
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};
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struct __acos
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __t) const { return acos(__t); }
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};
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struct __cosh
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __t) const { return cosh(__t); }
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};
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struct __sin
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __t) const { return sin(__t); }
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};
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struct __asin
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __t) const { return asin(__t); }
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};
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struct __sinh
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __t) const { return sinh(__t); }
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};
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struct __tan
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __t) const { return tan(__t); }
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};
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struct __atan
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __t) const { return atan(__t); }
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};
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struct __tanh
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __t) const { return tanh(__t); }
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};
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struct __exp
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __t) const { return exp(__t); }
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};
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struct __log
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __t) const { return log(__t); }
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};
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struct __log10
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __t) const { return log10(__t); }
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};
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struct __sqrt
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __t) const { return sqrt(__t); }
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};
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// In the past, we used to tailor operator applications semantics
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// to the specialization of standard function objects (i.e. plus<>, etc.)
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// That is incorrect. Therefore we provide our own surrogates.
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struct __unary_plus
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __t) const { return +__t; }
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};
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struct __negate
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __t) const { return -__t; }
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};
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struct __bitwise_not
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __t) const { return ~__t; }
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};
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struct __plus
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x + __y; }
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};
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struct __minus
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x - __y; }
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};
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struct __multiplies
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x * __y; }
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};
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struct __divides
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x / __y; }
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};
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struct __modulus
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x % __y; }
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};
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struct __bitwise_xor
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x ^ __y; }
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};
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struct __bitwise_and
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x & __y; }
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};
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struct __bitwise_or
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x | __y; }
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};
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struct __shift_left
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x << __y; }
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};
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struct __shift_right
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x >> __y; }
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};
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struct __logical_and
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{
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template<typename _Tp>
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bool operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x && __y; }
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};
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struct __logical_or
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{
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template<typename _Tp>
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bool operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x || __y; }
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};
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struct __logical_not
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{
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template<typename _Tp>
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bool operator()(const _Tp& __x) const { return !__x; }
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};
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struct __equal_to
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{
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template<typename _Tp>
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bool operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x == __y; }
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};
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struct __not_equal_to
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{
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template<typename _Tp>
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bool operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x != __y; }
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};
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struct __less
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{
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template<typename _Tp>
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bool operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x < __y; }
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};
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struct __greater
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{
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template<typename _Tp>
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bool operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x > __y; }
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};
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struct __less_equal
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{
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template<typename _Tp>
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bool operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x <= __y; }
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};
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struct __greater_equal
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{
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template<typename _Tp>
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bool operator()(const _Tp& __x, const _Tp& __y) const
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{ return __x >= __y; }
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};
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// The few binary functions we miss.
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struct __atan2
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __x, const _Tp& __y) const
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{ return atan2(__x, __y); }
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};
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struct __pow
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{
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template<typename _Tp>
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_Tp operator()(const _Tp& __x, const _Tp& __y) const
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{ return pow(__x, __y); }
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};
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// We need these bits in order to recover the return type of
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// some functions/operators now that we're no longer using
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// function templates.
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template<typename, typename _Tp>
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struct __fun
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{
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typedef _Tp result_type;
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};
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// several specializations for relational operators.
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template<typename _Tp>
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struct __fun<__logical_not, _Tp>
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{
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typedef bool result_type;
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};
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template<typename _Tp>
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struct __fun<__logical_and, _Tp>
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{
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typedef bool result_type;
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};
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template<typename _Tp>
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struct __fun<__logical_or, _Tp>
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{
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typedef bool result_type;
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};
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template<typename _Tp>
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struct __fun<__less, _Tp>
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{
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typedef bool result_type;
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};
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template<typename _Tp>
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struct __fun<__greater, _Tp>
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{
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typedef bool result_type;
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};
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template<typename _Tp>
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struct __fun<__less_equal, _Tp>
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{
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typedef bool result_type;
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};
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template<typename _Tp>
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struct __fun<__greater_equal, _Tp>
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{
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typedef bool result_type;
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};
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template<typename _Tp>
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struct __fun<__equal_to, _Tp>
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{
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typedef bool result_type;
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};
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template<typename _Tp>
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struct __fun<__not_equal_to, _Tp>
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{
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typedef bool result_type;
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};
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//
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// Apply function taking a value/const reference closure
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//
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template<typename _Dom, typename _Arg>
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class _FunBase
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{
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public:
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typedef typename _Dom::value_type value_type;
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_FunBase(const _Dom& __e, value_type __f(_Arg))
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: _M_expr(__e), _M_func(__f) {}
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value_type operator[](size_t __i) const
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{ return _M_func (_M_expr[__i]); }
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size_t size() const { return _M_expr.size ();}
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private:
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const _Dom& _M_expr;
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value_type (*_M_func)(_Arg);
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};
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template<class _Dom>
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struct _ValFunClos<_Expr,_Dom> : _FunBase<_Dom, typename _Dom::value_type>
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{
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typedef _FunBase<_Dom, typename _Dom::value_type> _Base;
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typedef typename _Base::value_type value_type;
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typedef value_type _Tp;
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_ValFunClos(const _Dom& __e, _Tp __f(_Tp)) : _Base(__e, __f) {}
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};
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template<typename _Tp>
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struct _ValFunClos<_ValArray,_Tp> : _FunBase<valarray<_Tp>, _Tp>
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{
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typedef _FunBase<valarray<_Tp>, _Tp> _Base;
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typedef _Tp value_type;
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_ValFunClos(const valarray<_Tp>& __v, _Tp __f(_Tp)) : _Base(__v, __f) {}
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};
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template<class _Dom>
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struct _RefFunClos<_Expr,_Dom> :
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_FunBase<_Dom, const typename _Dom::value_type&>
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{
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typedef _FunBase<_Dom, const typename _Dom::value_type&> _Base;
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typedef typename _Base::value_type value_type;
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typedef value_type _Tp;
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_RefFunClos(const _Dom& __e, _Tp __f(const _Tp&))
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: _Base(__e, __f) {}
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};
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template<typename _Tp>
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struct _RefFunClos<_ValArray,_Tp> : _FunBase<valarray<_Tp>, const _Tp&>
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{
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typedef _FunBase<valarray<_Tp>, const _Tp&> _Base;
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typedef _Tp value_type;
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_RefFunClos(const valarray<_Tp>& __v, _Tp __f(const _Tp&))
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: _Base(__v, __f) {}
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};
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//
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// Unary expression closure.
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//
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template<class _Oper, class _Arg>
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class _UnBase
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{
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public:
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typedef typename _Arg::value_type _Vt;
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typedef typename __fun<_Oper, _Vt>::result_type value_type;
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_UnBase(const _Arg& __e) : _M_expr(__e) {}
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value_type operator[](size_t __i) const
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{ return _Oper()(_M_expr[__i]); }
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size_t size() const { return _M_expr.size(); }
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private:
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const _Arg& _M_expr;
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};
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template<class _Oper, class _Dom>
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struct _UnClos<_Oper, _Expr, _Dom> : _UnBase<_Oper, _Dom>
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{
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typedef _Dom _Arg;
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typedef _UnBase<_Oper, _Dom> _Base;
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typedef typename _Base::value_type value_type;
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_UnClos(const _Arg& __e) : _Base(__e) {}
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};
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template<class _Oper, typename _Tp>
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struct _UnClos<_Oper, _ValArray, _Tp> : _UnBase<_Oper, valarray<_Tp> >
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{
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typedef valarray<_Tp> _Arg;
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typedef _UnBase<_Oper, valarray<_Tp> > _Base;
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typedef typename _Base::value_type value_type;
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_UnClos(const _Arg& __e) : _Base(__e) {}
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};
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//
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// Binary expression closure.
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//
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template<class _Oper, class _FirstArg, class _SecondArg>
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class _BinBase
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{
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public:
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typedef typename _FirstArg::value_type _Vt;
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typedef typename __fun<_Oper, _Vt>::result_type value_type;
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_BinBase(const _FirstArg& __e1, const _SecondArg& __e2)
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: _M_expr1(__e1), _M_expr2(__e2) {}
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value_type operator[](size_t __i) const
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{ return _Oper()(_M_expr1[__i], _M_expr2[__i]); }
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size_t size() const { return _M_expr1.size(); }
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private:
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const _FirstArg& _M_expr1;
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const _SecondArg& _M_expr2;
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};
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template<class _Oper, class _Clos>
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class _BinBase2
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{
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public:
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typedef typename _Clos::value_type _Vt;
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typedef typename __fun<_Oper, _Vt>::result_type value_type;
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_BinBase2(const _Clos& __e, const _Vt& __t)
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: _M_expr1(__e), _M_expr2(__t) {}
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value_type operator[](size_t __i) const
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{ return _Oper()(_M_expr1[__i], _M_expr2); }
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size_t size() const { return _M_expr1.size(); }
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private:
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const _Clos& _M_expr1;
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const _Vt& _M_expr2;
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};
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template<class _Oper, class _Clos>
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class _BinBase1
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{
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public:
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typedef typename _Clos::value_type _Vt;
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typedef typename __fun<_Oper, _Vt>::result_type value_type;
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_BinBase1(const _Vt& __t, const _Clos& __e)
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: _M_expr1(__t), _M_expr2(__e) {}
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value_type operator[](size_t __i) const
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{ return _Oper()(_M_expr1, _M_expr2[__i]); }
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size_t size() const { return _M_expr2.size(); }
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private:
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const _Vt& _M_expr1;
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const _Clos& _M_expr2;
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};
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template<class _Oper, class _Dom1, class _Dom2>
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struct _BinClos<_Oper, _Expr, _Expr, _Dom1, _Dom2>
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: _BinBase<_Oper,_Dom1,_Dom2>
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{
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typedef _BinBase<_Oper,_Dom1,_Dom2> _Base;
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typedef typename _Base::value_type value_type;
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_BinClos(const _Dom1& __e1, const _Dom2& __e2) : _Base(__e1, __e2) {}
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};
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template<class _Oper, typename _Tp>
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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 */
|
|
|
|
// Local Variables:
|
|
// mode:c++
|
|
// End:
|