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template <class Fun> | |
class ScopeGuard { | |
Fun f_; | |
bool active_; | |
public: | |
ScopeGuard(Fun f) | |
: f_(std::move(f)) | |
, active_(true) { | |
} | |
~ScopeGuard() { if (active_) f_(); } | |
void dismiss() { active_ = false; } | |
ScopeGuard() = delete; | |
ScopeGuard(const ScopeGuard&) = delete; | |
ScopeGuard& operator=(const ScopeGuard&) = delete; | |
ScopeGuard(ScopeGuard&& rhs) | |
: f_(std::move(rhs.f_)) | |
, active_(rhs.active_) { | |
rhs.dismiss(); | |
} | |
}; | |
namespace detail { | |
enum class ScopeGuardOnExit {}; | |
template <typename Fun> | |
ScopeGuard<Fun> operator+(ScopeGuardOnExit, Fun&& fn) { | |
return ScopeGuard<Fun>(std::forward<Fun>(fn)); | |
} | |
} | |
#define SCOPE_EXIT \ | |
auto ANONYMOUS_VARIABLE(SCOPE_EXIT_STATE) \ | |
= ::detail::ScopeGuardOnExit() + [&]() | |
#define CONCATENATE_IMPL(s1, s2) s1##s2 | |
#define CONCATENATE(s1, s2) CONCATENATE_IMPL(s1, s2) | |
#ifdef __COUNTER__ | |
#define ANONYMOUS_VARIABLE(str) \ | |
CONCATENATE(str, __COUNTER__) | |
#else | |
#define ANONYMOUS_VARIABLE(str) \ | |
CONCATENATE(str, __LINE__) | |
#endif |
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