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/** @file
Generic "guard" class templates. The destructor calls a function object with arbitrary parameters. This utility is
available in both the core and plugins.
@section license License
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#pragma once
namespace ts
{
// The destructor of this class calls the function object passed to its constructor. The function object must support a
// function call operator with no parameters. For example:
//
// ts::PostScript g([=]() -> void { TSHandleMLocRelease(bufp, parent, hdr); });
//
// The release() member will prevent the call to the function upon destruction.
//
// Helpful in avoiding errors due to exception throws or error function return points (like the one that caused Heartbleed).
//
template <typename Callable> class PostScript
{
public:
PostScript(Callable f) : _f(f) {}
~PostScript()
{
if (_armed) {
_f();
}
}
void
release()
{
_armed = false;
}
// No copying or moving.
PostScript(const PostScript &) = delete;
PostScript &operator=(const PostScript &) = delete;
private:
bool _armed = true;
Callable _f;
};
} // end namespace ts
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