mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-21 04:42:53 +08:00
1d506c26d9
This commit is the result of the following actions:
- Running gdb/copyright.py to update all of the copyright headers to
include 2024,
- Manually updating a few files the copyright.py script told me to
update, these files had copyright headers embedded within the
file,
- Regenerating gdbsupport/Makefile.in to refresh it's copyright
date,
- Using grep to find other files that still mentioned 2023. If
these files were updated last year from 2022 to 2023 then I've
updated them this year to 2024.
I'm sure I've probably missed some dates. Feel free to fix them up as
you spot them.
119 lines
3.6 KiB
C++
119 lines
3.6 KiB
C++
/* scoped_restore, a simple class for saving and restoring a value
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Copyright (C) 2016-2024 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(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. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef COMMON_SCOPED_RESTORE_H
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#define COMMON_SCOPED_RESTORE_H
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/* Base class for scoped_restore_tmpl. */
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class scoped_restore_base
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{
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public:
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/* This informs the (scoped_restore_tmpl<T>) dtor that you no longer
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want the original value restored. */
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void release () const
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{ m_saved_var = NULL; }
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protected:
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scoped_restore_base (void *saved_var)
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: m_saved_var (saved_var)
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{}
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/* The type-erased saved variable. This is here so that clients can
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call release() on a "scoped_restore" local, which is a typedef to
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a scoped_restore_base. See below. */
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mutable void *m_saved_var;
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};
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/* A convenience typedef. Users of make_scoped_restore declare the
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local RAII object as having this type. */
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typedef const scoped_restore_base &scoped_restore;
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/* An RAII-based object that saves a variable's value, and then
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restores it again when this object is destroyed. */
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template<typename T>
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class scoped_restore_tmpl : public scoped_restore_base
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{
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public:
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/* Create a new scoped_restore object that saves the current value
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of *VAR. *VAR will be restored when this scoped_restore object
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is destroyed. */
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scoped_restore_tmpl (T *var)
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: scoped_restore_base (var),
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m_saved_value (*var)
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{
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}
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/* Create a new scoped_restore object that saves the current value
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of *VAR, and sets *VAR to VALUE. *VAR will be restored when this
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scoped_restore object is destroyed. This is templated on T2 to
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allow passing VALUEs of types convertible to T.
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E.g.: T='base'; T2='derived'. */
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template <typename T2>
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scoped_restore_tmpl (T *var, T2 value)
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: scoped_restore_base (var),
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m_saved_value (*var)
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{
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*var = value;
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}
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scoped_restore_tmpl (const scoped_restore_tmpl<T> &other)
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: scoped_restore_base {other.m_saved_var},
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m_saved_value (other.m_saved_value)
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{
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other.m_saved_var = NULL;
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}
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~scoped_restore_tmpl ()
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{
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if (saved_var () != NULL)
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*saved_var () = m_saved_value;
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}
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private:
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/* Return a pointer to the saved variable with its type
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restored. */
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T *saved_var ()
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{ return static_cast<T *> (m_saved_var); }
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/* No need for this. It is intentionally not defined anywhere. */
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scoped_restore_tmpl &operator= (const scoped_restore_tmpl &);
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/* The saved value. */
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const T m_saved_value;
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};
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/* Make a scoped_restore. This is useful because it lets template
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argument deduction work. */
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template<typename T>
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scoped_restore_tmpl<T> make_scoped_restore (T *var)
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{
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return scoped_restore_tmpl<T> (var);
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}
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/* Make a scoped_restore. This is useful because it lets template
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argument deduction work. */
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template<typename T, typename T2>
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scoped_restore_tmpl<T> make_scoped_restore (T *var, T2 value)
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{
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return scoped_restore_tmpl<T> (var, value);
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}
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#endif /* COMMON_SCOPED_RESTORE_H */
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