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author | Daniel Wilhelm <shieldwed@outlook.com> | 2017-04-20 16:55:28 -0600 |
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committer | Daniel Wilhelm <shieldwed@outlook.com> | 2017-04-20 16:59:56 -0600 |
commit | 823740e1ffa2b3bd39f8dea8062f5c5a0d9c741b (patch) | |
tree | 63222010af3b90a36f29c1c9c360116973cdff38 /zen/scope_guard.h | |
parent | add .gitattributes for less line ending hassles (diff) | |
download | FreeFileSync-823740e1ffa2b3bd39f8dea8062f5c5a0d9c741b.tar.gz FreeFileSync-823740e1ffa2b3bd39f8dea8062f5c5a0d9c741b.tar.bz2 FreeFileSync-823740e1ffa2b3bd39f8dea8062f5c5a0d9c741b.zip |
normalize most lineendings
Diffstat (limited to 'zen/scope_guard.h')
-rwxr-xr-x | zen/scope_guard.h | 242 |
1 files changed, 121 insertions, 121 deletions
diff --git a/zen/scope_guard.h b/zen/scope_guard.h index 62552f7b..b336ad53 100755 --- a/zen/scope_guard.h +++ b/zen/scope_guard.h @@ -1,121 +1,121 @@ -// *****************************************************************************
-// * This file is part of the FreeFileSync project. It is distributed under *
-// * GNU General Public License: http://www.gnu.org/licenses/gpl-3.0 *
-// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
-// *****************************************************************************
-
-#ifndef SCOPE_GUARD_H_8971632487321434
-#define SCOPE_GUARD_H_8971632487321434
-
-#include <cassert>
-#include <exception>
-#include "type_tools.h"
-
-
-//std::uncaught_exceptions() currently unsupported on GCC and Clang => clean up ASAP
- static_assert(__GNUC__ < 6 || (__GNUC__ == 6 && (__GNUC_MINOR__ < 3 || (__GNUC_MINOR__ == 3 && __GNUC_PATCHLEVEL__ <= 1))), "check std::uncaught_exceptions support");
-
-namespace __cxxabiv1
-{
-struct __cxa_eh_globals;
-extern "C" __cxa_eh_globals* __cxa_get_globals() noexcept;
-}
-
-inline int getUncaughtExceptionCount()
-{
- return *(reinterpret_cast<unsigned int*>(static_cast<char*>(static_cast<void*>(__cxxabiv1::__cxa_get_globals())) + sizeof(void*)));
-}
-
-//best of Zen, Loki and C++17
-
-namespace zen
-{
-//Scope Guard
-/*
- auto guardAio = zen::makeGuard<ScopeGuardRunMode::ON_EXIT>([&] { ::CloseHandle(hDir); });
- ...
- guardAio.dismiss();
-
-Scope Exit:
- ZEN_ON_SCOPE_EXIT(::CloseHandle(hDir));
- ZEN_ON_SCOPE_FAIL(UndoPreviousWork());
- ZEN_ON_SCOPE_SUCCESS(NotifySuccess());
-*/
-
-enum class ScopeGuardRunMode
-{
- ON_EXIT,
- ON_SUCCESS,
- ON_FAIL
-};
-
-
-//partially specialize scope guard destructor code and get rid of those pesky MSVC "4127 conditional expression is constant"
-template <typename F> inline
-void runScopeGuardDestructor(F& fun, int /*exeptionCountOld*/, StaticEnum<ScopeGuardRunMode, ScopeGuardRunMode::ON_EXIT>)
-{
- try { fun(); }
- catch (...) { assert(false); } //consistency: don't expect exceptions for ON_EXIT even if "!failed"!
-}
-
-
-template <typename F> inline
-void runScopeGuardDestructor(F& fun, int exeptionCountOld, StaticEnum<ScopeGuardRunMode, ScopeGuardRunMode::ON_SUCCESS>)
-{
- const bool failed = getUncaughtExceptionCount() > exeptionCountOld;
- if (!failed)
- fun(); //throw X
-}
-
-
-template <typename F> inline
-void runScopeGuardDestructor(F& fun, int exeptionCountOld, StaticEnum<ScopeGuardRunMode, ScopeGuardRunMode::ON_FAIL>)
-{
- const bool failed = getUncaughtExceptionCount() > exeptionCountOld;
- if (failed)
- try { fun(); }
- catch (...) { assert(false); }
-}
-
-
-template <ScopeGuardRunMode runMode, typename F>
-class ScopeGuard
-{
-public:
- explicit ScopeGuard(const F& fun) : fun_(fun) {}
- explicit ScopeGuard( F&& fun) : fun_(std::move(fun)) {}
-
- ScopeGuard(ScopeGuard&& other) : fun_(std::move(other.fun_)),
- exeptionCount_(other.exeptionCount_),
- dismissed_(other.dismissed_) { other.dismissed_ = true; }
-
- ~ScopeGuard() noexcept(runMode != ScopeGuardRunMode::ON_SUCCESS)
- {
- if (!dismissed_)
- runScopeGuardDestructor(fun_, exeptionCount_, StaticEnum<ScopeGuardRunMode, runMode>());
- }
-
- void dismiss() { dismissed_ = true; }
-
-private:
- ScopeGuard (const ScopeGuard&) = delete;
- ScopeGuard& operator=(const ScopeGuard&) = delete;
-
- F fun_;
- const int exeptionCount_ = getUncaughtExceptionCount();
- bool dismissed_ = false;
-};
-
-
-template <ScopeGuardRunMode runMode, class F> inline
-auto makeGuard(F&& fun) { return ScopeGuard<runMode, std::decay_t<F>>(std::forward<F>(fun)); }
-}
-
-#define ZEN_CONCAT_SUB(X, Y) X ## Y
-#define ZEN_CONCAT(X, Y) ZEN_CONCAT_SUB(X, Y)
-
-#define ZEN_ON_SCOPE_EXIT(X) auto ZEN_CONCAT(dummy, __LINE__) = zen::makeGuard<zen::ScopeGuardRunMode::ON_EXIT >([&]{ X; }); (void)ZEN_CONCAT(dummy, __LINE__);
-#define ZEN_ON_SCOPE_FAIL(X) auto ZEN_CONCAT(dummy, __LINE__) = zen::makeGuard<zen::ScopeGuardRunMode::ON_FAIL >([&]{ X; }); (void)ZEN_CONCAT(dummy, __LINE__);
-#define ZEN_ON_SCOPE_SUCCESS(X) auto ZEN_CONCAT(dummy, __LINE__) = zen::makeGuard<zen::ScopeGuardRunMode::ON_SUCCESS>([&]{ X; }); (void)ZEN_CONCAT(dummy, __LINE__);
-
-#endif //SCOPE_GUARD_H_8971632487321434
+// ***************************************************************************** +// * This file is part of the FreeFileSync project. It is distributed under * +// * GNU General Public License: http://www.gnu.org/licenses/gpl-3.0 * +// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved * +// ***************************************************************************** + +#ifndef SCOPE_GUARD_H_8971632487321434 +#define SCOPE_GUARD_H_8971632487321434 + +#include <cassert> +#include <exception> +#include "type_tools.h" + + +//std::uncaught_exceptions() currently unsupported on GCC and Clang => clean up ASAP + static_assert(__GNUC__ < 6 || (__GNUC__ == 6 && (__GNUC_MINOR__ < 3 || (__GNUC_MINOR__ == 3 && __GNUC_PATCHLEVEL__ <= 1))), "check std::uncaught_exceptions support"); + +namespace __cxxabiv1 +{ +struct __cxa_eh_globals; +extern "C" __cxa_eh_globals* __cxa_get_globals() noexcept; +} + +inline int getUncaughtExceptionCount() +{ + return *(reinterpret_cast<unsigned int*>(static_cast<char*>(static_cast<void*>(__cxxabiv1::__cxa_get_globals())) + sizeof(void*))); +} + +//best of Zen, Loki and C++17 + +namespace zen +{ +//Scope Guard +/* + auto guardAio = zen::makeGuard<ScopeGuardRunMode::ON_EXIT>([&] { ::CloseHandle(hDir); }); + ... + guardAio.dismiss(); + +Scope Exit: + ZEN_ON_SCOPE_EXIT(::CloseHandle(hDir)); + ZEN_ON_SCOPE_FAIL(UndoPreviousWork()); + ZEN_ON_SCOPE_SUCCESS(NotifySuccess()); +*/ + +enum class ScopeGuardRunMode +{ + ON_EXIT, + ON_SUCCESS, + ON_FAIL +}; + + +//partially specialize scope guard destructor code and get rid of those pesky MSVC "4127 conditional expression is constant" +template <typename F> inline +void runScopeGuardDestructor(F& fun, int /*exeptionCountOld*/, StaticEnum<ScopeGuardRunMode, ScopeGuardRunMode::ON_EXIT>) +{ + try { fun(); } + catch (...) { assert(false); } //consistency: don't expect exceptions for ON_EXIT even if "!failed"! +} + + +template <typename F> inline +void runScopeGuardDestructor(F& fun, int exeptionCountOld, StaticEnum<ScopeGuardRunMode, ScopeGuardRunMode::ON_SUCCESS>) +{ + const bool failed = getUncaughtExceptionCount() > exeptionCountOld; + if (!failed) + fun(); //throw X +} + + +template <typename F> inline +void runScopeGuardDestructor(F& fun, int exeptionCountOld, StaticEnum<ScopeGuardRunMode, ScopeGuardRunMode::ON_FAIL>) +{ + const bool failed = getUncaughtExceptionCount() > exeptionCountOld; + if (failed) + try { fun(); } + catch (...) { assert(false); } +} + + +template <ScopeGuardRunMode runMode, typename F> +class ScopeGuard +{ +public: + explicit ScopeGuard(const F& fun) : fun_(fun) {} + explicit ScopeGuard( F&& fun) : fun_(std::move(fun)) {} + + ScopeGuard(ScopeGuard&& other) : fun_(std::move(other.fun_)), + exeptionCount_(other.exeptionCount_), + dismissed_(other.dismissed_) { other.dismissed_ = true; } + + ~ScopeGuard() noexcept(runMode != ScopeGuardRunMode::ON_SUCCESS) + { + if (!dismissed_) + runScopeGuardDestructor(fun_, exeptionCount_, StaticEnum<ScopeGuardRunMode, runMode>()); + } + + void dismiss() { dismissed_ = true; } + +private: + ScopeGuard (const ScopeGuard&) = delete; + ScopeGuard& operator=(const ScopeGuard&) = delete; + + F fun_; + const int exeptionCount_ = getUncaughtExceptionCount(); + bool dismissed_ = false; +}; + + +template <ScopeGuardRunMode runMode, class F> inline +auto makeGuard(F&& fun) { return ScopeGuard<runMode, std::decay_t<F>>(std::forward<F>(fun)); } +} + +#define ZEN_CONCAT_SUB(X, Y) X ## Y +#define ZEN_CONCAT(X, Y) ZEN_CONCAT_SUB(X, Y) + +#define ZEN_ON_SCOPE_EXIT(X) auto ZEN_CONCAT(dummy, __LINE__) = zen::makeGuard<zen::ScopeGuardRunMode::ON_EXIT >([&]{ X; }); (void)ZEN_CONCAT(dummy, __LINE__); +#define ZEN_ON_SCOPE_FAIL(X) auto ZEN_CONCAT(dummy, __LINE__) = zen::makeGuard<zen::ScopeGuardRunMode::ON_FAIL >([&]{ X; }); (void)ZEN_CONCAT(dummy, __LINE__); +#define ZEN_ON_SCOPE_SUCCESS(X) auto ZEN_CONCAT(dummy, __LINE__) = zen::makeGuard<zen::ScopeGuardRunMode::ON_SUCCESS>([&]{ X; }); (void)ZEN_CONCAT(dummy, __LINE__); + +#endif //SCOPE_GUARD_H_8971632487321434 |