131 lines
4.1 KiB
C++
131 lines
4.1 KiB
C++
/* xspan -- a minimally invasive checked memory smart pointer
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This file is part of the UPX executable compressor.
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Copyright (C) 1996-2023 Markus Franz Xaver Johannes Oberhumer
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All Rights Reserved.
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UPX and the UCL library are free software; you can redistribute them
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and/or modify them under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program 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
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along with this program; see the file COPYING.
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If not, write to the Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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Markus F.X.J. Oberhumer
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<markus@oberhumer.com>
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*/
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#pragma once
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XSPAN_NAMESPACE_BEGIN
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/*************************************************************************
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// PtrOrSpanOrNull
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//
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// invariants:
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// ptr can be null
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// if ptr != null && base != null then ptr is valid in base
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**************************************************************************/
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template <class T>
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struct PtrOrSpanOrNull {
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private:
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#define CSelf PtrOrSpanOrNull
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typedef CSelf<T> Self;
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// core config
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enum { configRequirePtr = false };
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enum { configRequireBase = false };
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#include "xspan_impl_common.h"
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public:
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// constructors from pointers
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CSelf(pointer first) : ptr(first), base(nullptr), size_in_bytes(0) { assertInvariants(); }
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// constructors
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CSelf(const Self &other)
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: ptr(other.ptr), base(other.base), size_in_bytes(other.size_in_bytes) {
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assertInvariants();
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}
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template <class U>
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CSelf(const CSelf<U> &other, XSPAN_REQUIRES_CONVERTIBLE_A)
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: ptr(other.ptr), base(other.base), size_in_bytes(other.size_in_bytes) {
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assertInvariants();
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}
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// constructors from Span friends
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template <class U>
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CSelf(const PtrOrSpan<U> &other, XSPAN_REQUIRES_CONVERTIBLE_A)
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: ptr(other.ptr), base(other.base), size_in_bytes(other.size_in_bytes) {
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assertInvariants();
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}
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template <class U>
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CSelf(const Span<U> &other, XSPAN_REQUIRES_CONVERTIBLE_A)
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: ptr(other.ptr), base(other.base), size_in_bytes(other.size_in_bytes) {
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assertInvariants();
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}
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// assignment from Span friends
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template <class U>
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XSPAN_REQUIRES_CONVERTIBLE_R(Self &)
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operator=(const PtrOrSpan<U> &other) {
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return assign(Self(other));
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}
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template <class U>
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XSPAN_REQUIRES_CONVERTIBLE_R(Self &)
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operator=(const Span<U> &other) {
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return assign(Self(other));
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}
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// nullptr
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forceinline CSelf(std::nullptr_t) noexcept : ptr(nullptr), base(nullptr), size_in_bytes(0) {}
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forceinline Self &operator=(std::nullptr_t) noexcept {
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ptr = nullptr;
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return *this;
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}
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#undef CSelf
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};
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// raw_bytes overload
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template <class T>
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inline typename PtrOrSpanOrNull<T>::pointer raw_bytes(const PtrOrSpanOrNull<T> &a,
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size_t size_in_bytes) {
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return a.raw_bytes(size_in_bytes);
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}
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template <class T>
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inline typename PtrOrSpanOrNull<T>::pointer raw_index_bytes(const PtrOrSpanOrNull<T> &a,
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size_t index, size_t size_in_bytes) {
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typedef typename PtrOrSpanOrNull<T>::element_type element_type;
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if very_unlikely (a.raw_ptr() == nullptr)
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throwInternalError("raw_index_bytes unexpected NULL ptr");
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return a.raw_bytes(mem_size(sizeof(element_type), index, size_in_bytes)) + index;
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}
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/*************************************************************************
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//
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**************************************************************************/
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XSPAN_NAMESPACE_END
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#if !XSPAN_CONFIG_ENABLE_IMPLICIT_CONVERSION || 1
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#define C XSPAN_NS(PtrOrSpanOrNull)
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#define D XSPAN_NS(PtrOrSpan)
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#define E XSPAN_NS(Span)
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#include "xspan_fwd.h"
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#undef C
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#undef D
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#undef E
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#endif
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/* vim:set ts=4 sw=4 et: */
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