// The template and inlines for the -*- C++ -*- mask_array class. // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2004 // Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 2, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // You should have received a copy of the GNU General Public License along // with this library; see the file COPYING. If not, write to the Free // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, // USA. // As a special exception, you may use this file as part of a free software // library without restriction. Specifically, if other files instantiate // templates or use macros or inline functions from this file, or you compile // this file and link it with other files to produce an executable, this // file does not by itself cause the resulting executable to be covered by // the GNU General Public License. This exception does not however // invalidate any other reasons why the executable file might be covered by // the GNU General Public License. // Written by Gabriel Dos Reis /** @file mask_array.h * This is an internal header file, included by other library headers. * You should not attempt to use it directly. */ #ifndef _MASK_ARRAY_H #define _MASK_ARRAY_H 1 #pragma GCC system_header namespace std { /** * @brief Reference to selected subset of an array. * * A mask_array is a reference to the actual elements of an array specified * by a bitmask in the form of an array of bool. The way to get a * mask_array is to call operator[](valarray) on a valarray. The * returned mask_array then permits carrying operations out on the * referenced subset of elements in the original valarray. * * For example, if a mask_array is obtained using the array (false, true, * false, true) as an argument, the mask array has two elements referring * to array[1] and array[3] in the underlying array. * * @param Tp Element type. */ template class mask_array { public: typedef _Tp value_type; void operator=(const valarray<_Tp>&) const; /// Multiply slice elements by corresponding elements of @a v. void operator*=(const valarray<_Tp>&) const; /// Divide slice elements by corresponding elements of @a v. void operator/=(const valarray<_Tp>&) const; /// Modulo slice elements by corresponding elements of @a v. void operator%=(const valarray<_Tp>&) const; /// Add corresponding elements of @a v to slice elements. void operator+=(const valarray<_Tp>&) const; /// Subtract corresponding elements of @a v from slice elements. void operator-=(const valarray<_Tp>&) const; /// Logical xor slice elements with corresponding elements of @a v. void operator^=(const valarray<_Tp>&) const; /// Logical and slice elements with corresponding elements of @a v. void operator&=(const valarray<_Tp>&) const; /// Logical or slice elements with corresponding elements of @a v. void operator|=(const valarray<_Tp>&) const; /// Left shift slice elements by corresponding elements of @a v. void operator<<=(const valarray<_Tp>&) const; /// Right shift slice elements by corresponding elements of @a v. void operator>>=(const valarray<_Tp>&) const; /// Assign all slice elements to @a t. void operator=(const _Tp&) const; // ~mask_array (); template void operator=(const _Expr<_Dom,_Tp>&) const; template void operator*=(const _Expr<_Dom,_Tp>&) const; template void operator/=(const _Expr<_Dom,_Tp>&) const; template void operator%=(const _Expr<_Dom,_Tp>&) const; template void operator+=(const _Expr<_Dom,_Tp>&) const; template void operator-=(const _Expr<_Dom,_Tp>&) const; template void operator^=(const _Expr<_Dom,_Tp>&) const; template void operator&=(const _Expr<_Dom,_Tp>&) const; template void operator|=(const _Expr<_Dom,_Tp>&) const; template void operator<<=(const _Expr<_Dom,_Tp>&) const; template void operator>>=(const _Expr<_Dom,_Tp>&) const; private: mask_array(_Array<_Tp>, size_t, _Array); friend class valarray<_Tp>; const size_t _M_sz; const _Array _M_mask; const _Array<_Tp> _M_array; /// Copy constructor. Both slices refer to the same underlying array. mask_array (const mask_array&); // not implemented mask_array(); /// Assignment operator. Assigns elements to corresponding elements /// of @a a. mask_array& operator=(const mask_array&); }; template inline mask_array<_Tp>::mask_array(const mask_array<_Tp>& a) : _M_sz(a._M_sz), _M_mask(a._M_mask), _M_array(a._M_array) {} template inline mask_array<_Tp>::mask_array(_Array<_Tp> __a, size_t __s, _Array __m) : _M_sz(__s), _M_mask(__m), _M_array(__a) {} template inline void mask_array<_Tp>::operator=(const _Tp& __t) const { std::__valarray_fill(_M_array, _M_sz, _M_mask, __t); } template inline void mask_array<_Tp>::operator=(const valarray<_Tp>& __v) const { std::__valarray_copy(_Array<_Tp>(__v), __v.size(), _M_array, _M_mask); } template template inline void mask_array<_Tp>::operator=(const _Expr<_Ex, _Tp>& __e) const { std::__valarray_copy(__e, __e.size(), _M_array, _M_mask); } #undef _DEFINE_VALARRAY_OPERATOR #define _DEFINE_VALARRAY_OPERATOR(_Op, _Name) \ template \ inline void \ mask_array<_Tp>::operator _Op##=(const valarray<_Tp>& __v) const \ { \ _Array_augmented_##_Name(_M_array, _M_mask, \ _Array<_Tp>(__v), __v.size()); \ } \ \ template \ template \ inline void \ mask_array<_Tp>::operator _Op##=(const _Expr<_Dom, _Tp>& __e) const\ { \ _Array_augmented_##_Name(_M_array, _M_mask, __e, __e.size()); \ } _DEFINE_VALARRAY_OPERATOR(*, __multiplies) _DEFINE_VALARRAY_OPERATOR(/, __divides) _DEFINE_VALARRAY_OPERATOR(%, __modulus) _DEFINE_VALARRAY_OPERATOR(+, __plus) _DEFINE_VALARRAY_OPERATOR(-, __minus) _DEFINE_VALARRAY_OPERATOR(^, __bitwise_xor) _DEFINE_VALARRAY_OPERATOR(&, __bitwise_and) _DEFINE_VALARRAY_OPERATOR(|, __bitwise_or) _DEFINE_VALARRAY_OPERATOR(<<, __shift_left) _DEFINE_VALARRAY_OPERATOR(>>, __shift_right) #undef _DEFINE_VALARRAY_OPERATOR } // std:: #endif /* _MASK_ARRAY_H */ // Local Variables: // mode:c++ // End: