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I'm attempting to write a simple ScopeGuard based on Alexandrescu concepts but with c++11 idioms. namespace RAII { template< typename Lambda > class ScopeGuard { mutable bool committed; Lambda rollbackLambda; public: ScopeGuard( const Lambda& _l) : committed(false) , rollbackLambda(_l) {} template< typename AdquireLambda > ScopeGuard( const AdquireLambda& _al , const Lambda& _l) : committed(false) , rollbackLambda(_l) { _al(); } ~ScopeGuard() { if (!committed) rollbackLambda(); } inline void commit() const { committed = true; } }; template< typename aLambda , typename rLambda> const ScopeGuard< rLambda >& makeScopeGuard( const aLambda& _a , const rLambda& _r) { return ScopeGuard< rLambda >( _a , _r ); } template<typename rLambda> const ScopeGuard< rLambda >& makeScopeGuard(const rLambda& _r) { return ScopeGuard< rLambda >(_r ); } } Here is the usage: void SomeFuncThatShouldBehaveAtomicallyInCaseOfExceptions() { std::vector<int> myVec; std::vector<int> someOtherVec; myVec.push_back(5); //first constructor, adquire happens elsewhere const auto& a = RAII::makeScopeGuard( [&]() { myVec.pop_back(); } ); //sintactically neater, since everything happens in a single line const auto& b = RAII::makeScopeGuard( [&]() { someOtherVec.push_back(42); } , [&]() { someOtherVec.pop_back(); } ); b.commit(); a.commit(); } Since my version is way shorter than most examples out there (like Boost ScopeExit) i'm wondering what specialties

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