Viewing file:  scope.h (1.76 KB) -rw-r--r--
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/*
Copyright (c) 2020, MariaDB
This program 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; version 2 of
the License.
This program 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 program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA
*/
#pragma once
#include <type_traits>
#include <utility>
namespace detail
{
template <typename Callable> class scope_exit
{
public:
template <typename F>
explicit scope_exit(F &&f) : function_(std::forward<F>(f))
{
}
scope_exit(scope_exit &&rhs)
: function_(std::move(rhs.function_)), engaged_(rhs.engaged_)
{
rhs.release();
}
scope_exit(const scope_exit &)= delete;
scope_exit &operator=(scope_exit &&)= delete;
scope_exit &operator=(const scope_exit &)= delete;
void release() { engaged_= false; }
~scope_exit()
{
if (engaged_)
function_();
}
private:
Callable function_;
bool engaged_= true;
};
} // end namespace detail
template <typename Callable>
detail::scope_exit<typename std::decay<Callable>::type>
make_scope_exit(Callable &&f)
{
return detail::scope_exit<typename std::decay<Callable>::type>(
std::forward<Callable>(f));
}
#define CONCAT_IMPL(x, y) x##y
#define CONCAT(x, y) CONCAT_IMPL(x, y)
#define ANONYMOUS_VARIABLE CONCAT(_anonymous_variable, __LINE__)
#define SCOPE_EXIT auto ANONYMOUS_VARIABLE= make_scope_exit
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