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// **************************************************************************
// * This file is part of the zenXML project. It is distributed under the *
// * Boost Software License, Version 1.0. See accompanying file *
// * LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt. *
// * Copyright (C) 2011 ZenJu (zhnmju123 AT gmx.de) *
// **************************************************************************
#ifndef ZEN_SCOPEGUARD_8971632487321434
#define ZEN_SCOPEGUARD_8971632487321434
//best of Zen, Loki and C++11
namespace zen
{
//Scope Guard
/*
zen::ScopeGuard lockAio = zen::makeGuard([&]() { ::CancelIo(hDir); });
...
lockAio.dismiss();
*/
//Scope Exit
/*
ZEN_ON_BLOCK_EXIT(::CloseHandle(hDir));
*/
class ScopeGuardBase
{
public:
void dismiss() const { dismissed_ = true; }
protected:
ScopeGuardBase() : dismissed_(false) {}
ScopeGuardBase(const ScopeGuardBase& other) : dismissed_(other.dismissed_) { other.dismissed_ = true; } //take over responsibility
~ScopeGuardBase() {}
bool isDismissed() const { return dismissed_; }
private:
ScopeGuardBase& operator=(const ScopeGuardBase&); // = delete;
mutable bool dismissed_;
};
template <typename F>
class ScopeGuardImpl : public ScopeGuardBase
{
public:
ScopeGuardImpl(F fun) : fun_(fun) {}
~ScopeGuardImpl()
{
if (!this->isDismissed())
try
{
fun_();
}
catch (...) {}
}
private:
F fun_;
};
typedef const ScopeGuardBase& ScopeGuard;
template <class F> inline
ScopeGuardImpl<F> makeGuard(F fun) { return ScopeGuardImpl<F>(fun); }
}
#define ZEN_CONCAT_SUB(X, Y) X ## Y
#define ZEN_CONCAT(X, Y) ZEN_CONCAT_SUB(X, Y)
#define ZEN_ON_BLOCK_EXIT(X) zen::ScopeGuard ZEN_CONCAT(dummy, __LINE__) = zen::makeGuard([&](){X;}); (void)ZEN_CONCAT(dummy, __LINE__);
#endif //ZEN_SCOPEGUARD_8971632487321434
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