Mercurial > octave
view libinterp/operators/op-mi.cc @ 31706:597f3ee61a48 stable
update Octave Project Developers copyright for the new year
author | John W. Eaton <jwe@octave.org> |
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date | Fri, 06 Jan 2023 13:11:27 -0500 |
parents | e88a07dec498 |
children | 3722c5b1a8c8 |
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//////////////////////////////////////////////////////////////////////// // // Copyright (C) 2020-2023 The Octave Project Developers // // See the file COPYRIGHT.md in the top-level directory of this // distribution or <https://octave.org/copyright/>. // // This file is part of Octave. // // Octave 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 3 of the License, or // (at your option) any later version. // // Octave 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 Octave; see the file COPYING. If not, see // <https://www.gnu.org/licenses/>. // //////////////////////////////////////////////////////////////////////// #if defined (HAVE_CONFIG_H) # include "config.h" #endif #include <iostream> #include "errwarn.h" #include "ops.h" #include "ov-magic-int.h" #include "ov-typeinfo.h" #include "ov.h" OCTAVE_BEGIN_NAMESPACE(octave) // Magic integer unary ops. Only + and - are allowed so that // expressions like // // int64 (-9007199254740994) // // produce proper int64 constants. static octave_value oct_unop_unsigned_uplus (const octave_base_value& a) { const octave_magic_uint& v = dynamic_cast<const octave_magic_uint&> (a); // no-op. // FIXME: but can we do this just by incrementing the reference count? return octave_value (v.clone ()); } static octave_value oct_unop_unsigned_uminus (const octave_base_value& a) { const octave_magic_uint& v = dynamic_cast<const octave_magic_uint&> (a); // We are storing a uint64 value, so some fakery is needed here. // Is there a better way? // FIXME: Maybe there should also be octave_magic_int::as_TYPE_value // functions? octave_uint64 val (v.scalar_ref ()); uint64_t ival = val.value (); static const uint64_t max_val = static_cast<uint64_t> (std::numeric_limits<int64_t>::max ()); static const uint64_t max_val_p1 = max_val + 1; if (ival <= max_val) { int64_t signed_ival = ival; return octave_value (new octave_magic_int (-signed_ival)); } if (ival == max_val_p1) { // Correctly capture intmin. For example, negating uint8(128) // should return int8(-128) but converting directly to int8 and // negating will not return the correct result. static const int64_t min_signed_ival = std::numeric_limits<int64_t>::min (); return octave_value (new octave_magic_int (min_signed_ival)); } return octave_value (-static_cast<double> (ival)); } static octave_value oct_unop_signed_uplus (const octave_base_value& a) { const octave_magic_int& v = dynamic_cast<const octave_magic_int&> (a); // no-op. // FIXME: but can we do this just by incrementing the reference count? return octave_value (v.clone ()); } static octave_value oct_unop_signed_uminus (const octave_base_value& a) { const octave_magic_int& v = dynamic_cast<const octave_magic_int&> (a); // FIXME: Maybe there should also be octave_magic_int::as_TYPE_value // functions? octave_int64 val (v.scalar_ref ()); return octave_value (new octave_magic_int (-val)); } void install_mi_ops (octave::type_info& ti) { INSTALL_UNOP_TI (ti, op_uplus, octave_magic_uint, unsigned_uplus); INSTALL_UNOP_TI (ti, op_uminus, octave_magic_uint, unsigned_uminus); INSTALL_UNOP_TI (ti, op_uplus, octave_magic_int, signed_uplus); INSTALL_UNOP_TI (ti, op_uminus, octave_magic_int, signed_uminus); } OCTAVE_END_NAMESPACE(octave)