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// Copyright (c) the JPEG XL Project Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#ifndef LIB_JXL_BASE_SCOPE_GUARD_H_
#define LIB_JXL_BASE_SCOPE_GUARD_H_
#include <utility>
namespace jxl {
template <typename Callback>
class ScopeGuard {
public:
// Discourage unnecessary moves / copies.
ScopeGuard(const ScopeGuard &) = delete;
ScopeGuard &operator=(const ScopeGuard &) = delete;
ScopeGuard &operator=(ScopeGuard &&) = delete;
// Pre-C++17 does not guarantee RVO -> require move constructor.
ScopeGuard(ScopeGuard &&other) noexcept
: callback_(std::move(other.callback_)) {
other.armed_ = false;
}
template <typename CallbackParam>
ScopeGuard(CallbackParam &&callback, bool armed)
: callback_(std::forward<CallbackParam>(callback)), armed_(armed) {}
~ScopeGuard() {
if (armed_) callback_();
}
void Disarm() { armed_ = false; }
private:
Callback callback_;
bool armed_;
};
template <typename Callback>
ScopeGuard<Callback> MakeScopeGuard(Callback &&callback) {
return ScopeGuard<Callback>{std::forward<Callback>(callback), true};
}
} // namespace jxl
#endif // LIB_JXL_BASE_SCOPE_GUARD_H_