mirror of
https://github.com/wiiu-env/EnvironmentLoader.git
synced 2024-12-29 06:22:01 +01:00
114 lines
3.7 KiB
C++
114 lines
3.7 KiB
C++
/**
|
|
* The contents of this file are based on the article posted at the
|
|
* following location:
|
|
*
|
|
* http://crascit.com/2015/06/03/on-leaving-scope-part-2/
|
|
*
|
|
* The material in that article has some commonality with the code made
|
|
* available as part of Facebook's folly library at:
|
|
*
|
|
* https://github.com/facebook/folly/blob/master/folly/ScopeGuard.h
|
|
*
|
|
* Furthermore, similar material is currently part of a draft proposal
|
|
* to the C++ standards committee, referencing the same work by Andrei
|
|
* Alexandresu that led to the folly implementation. The draft proposal
|
|
* can be found at:
|
|
*
|
|
* http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4189.pdf
|
|
*
|
|
* With the above in mind, the content below is made available under
|
|
* the same license terms as folly to minimize any legal concerns.
|
|
* Should there be ambiguity over copyright ownership between Facebook
|
|
* and myself for any material included in this file, it should be
|
|
* interpreted that Facebook is the copyright owner for the ambiguous
|
|
* section of code concerned.
|
|
*
|
|
* Craig Scott
|
|
* 3rd June 2015
|
|
*
|
|
* ----------------------------------------------------------------------
|
|
*
|
|
* Copyright 2015 Craig Scott
|
|
*
|
|
* Licensed 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.
|
|
*/
|
|
|
|
#ifndef CRASCIT_ONLEAVINGSCOPE_H
|
|
#define CRASCIT_ONLEAVINGSCOPE_H
|
|
|
|
#include <type_traits>
|
|
#include <utility>
|
|
|
|
|
|
/**
|
|
* This class is intended to be used only to create a local object on the
|
|
* stack. It accepts a function object in its constructor and will invoke
|
|
* that function object in its destructor. The class provides a move
|
|
* constructor so it can be used with the onLeavingScope factory function,
|
|
* but it cannot be copied.
|
|
*
|
|
* Do no use this function directly, use the onLeavingScope() factory
|
|
* function instead.
|
|
*/
|
|
template<typename Func>
|
|
class OnLeavingScope {
|
|
public:
|
|
// Prevent copying
|
|
OnLeavingScope(const OnLeavingScope &) = delete;
|
|
OnLeavingScope &operator=(const OnLeavingScope &) = delete;
|
|
|
|
// Allow moving
|
|
OnLeavingScope(OnLeavingScope &&other) : m_func(std::move(other.m_func)),
|
|
m_owner(other.m_owner) {
|
|
other.m_owner = false;
|
|
}
|
|
|
|
OnLeavingScope(const Func &f) : m_func(f),
|
|
m_owner(true) {
|
|
}
|
|
OnLeavingScope(Func &&f) : m_func(std::move(f)),
|
|
m_owner(true) {
|
|
}
|
|
~OnLeavingScope() {
|
|
if (m_owner)
|
|
m_func();
|
|
}
|
|
|
|
private:
|
|
Func m_func;
|
|
bool m_owner;
|
|
};
|
|
|
|
|
|
/**
|
|
* Factory function for creating an OnLeavingScope object. It is intended
|
|
* to be used like so:
|
|
*
|
|
* auto cleanup = onLeavingScope(...);
|
|
*
|
|
* where the ... could be a lambda function, function object or pointer to
|
|
* a free function to be invoked when the cleanup object goes out of scope.
|
|
* The function object must take no function arguments, but can return any
|
|
* type (the return value is ignored).
|
|
*
|
|
* The \a Func template parameter would rarely, if ever, be manually
|
|
* specified. Normally, it would be deduced automatically by the compiler
|
|
* from the object passed as the function argument.
|
|
*/
|
|
template<typename Func>
|
|
OnLeavingScope<typename std::decay<Func>::type> onLeavingScope(Func &&f) {
|
|
return OnLeavingScope<typename std::decay<Func>::type>(std::forward<Func>(f));
|
|
}
|
|
|
|
#endif // CRASCIT_ONLEAVINGSCOPE_H
|