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C 11? ???? ???? ScopeGuard
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??? ??? ??? ???? ? ?? ?? ?????. ??? ??(?? ???): * C 11 ???? ???? ??? ScopeGuard? ???? ??? ?????? * C 11?? ??? ScopeGuard ??: ???? ?? ?? * C 11 ScopeGuard: ???? ???? I

Oct 26, 2024 am 10:12 AM

以下是幾個符合文章內(nèi)容的英文標題： 簡潔的標題（簡短且直接）： * How to Build a Simple ScopeGuard with C 11 Idioms? * Implementing a Simple ScopeGuard in C 11: A Practical Approach * C 11 ScopeGuard: A Concise and Practical Implementation 更詳細的標題（闡明文章重點）： * C 11 ScopeGuard: A S

C 11? ???? ???? ScopeGuard

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C 11 ???? ???? Alexandrescu? ???? ???? ?? ?? ??? ScopeGuard?

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??? C 11 ???? ???? ? ScopeGuard ?????. 

<code class="cpp">namespace RAII
{
    template< typename Lambda >
    class ScopeGuard
    {
        mutable bool committed;
        Lambda rollbackLambda; 
        public:

            ScopeGuard( const Lambda&amp; _l) : committed(false) , rollbackLambda(_l) {}

            template< typename AdquireLambda >
            ScopeGuard( const AdquireLambda&amp; _al , const Lambda&amp; _l) : committed(false) , rollbackLambda(_l)
            {
                _al();
            }

            ~ScopeGuard()
            {
                if (!committed)
                    rollbackLambda();
            }
            inline void commit() const { committed = true; }
    };

    template< typename aLambda , typename rLambda>
    const ScopeGuard< rLambda >&amp; makeScopeGuard( const aLambda&amp; _a , const rLambda&amp; _r)
    {
        return ScopeGuard< rLambda >( _a , _r );
    }

    template<typename rLambda>
    const ScopeGuard< rLambda >&amp; makeScopeGuard(const rLambda&amp; _r)
    {
        return ScopeGuard< rLambda >(_r );
    }
}</code>

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<code class="cpp">void SomeFuncThatShouldBehaveAtomicallyInCaseOfExceptions() 
{
   std::vector<int> myVec;
   std::vector<int> someOtherVec;

   myVec.push_back(5);
   //first constructor, adquire happens elsewhere
   const auto&amp; a = RAII::makeScopeGuard( [&amp;]() { myVec.pop_back(); } );  

   //sintactically neater, since everything happens in a single line
   const auto&amp; b = RAII::makeScopeGuard( [&amp;]() { someOtherVec.push_back(42); }
                     , [&amp;]() { someOtherVec.pop_back(); } ); 

   b.commit();
   a.commit();
}</code>

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STD :: Chrono? ?? ?? ??, ?? ?? ??, ?? ?? ? ?? ?? ? ?? ?? ??? ???? C?? ???? ??? ?????. 1. std :: chrono :: system_clock :: now ()? ???? ?? ??? ?? ? ??? ?? ??? ???? ?? ? ? ??? ??? ??? ???? ?? ?? ? ????. 2. std :: Chrono :: steady_clock? ???? ?? ??? ???? ?? ??? ???? duration_cast? ?? ?? ?, ? ? ?? ??? ??????. 3. ?? (time_point) ? ?? (??)? ?? ??? ? ? ??? ?? ??? ? ?? epoch (epoch)???? ???????.

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???? ?????? ??? ?? ???? ?? ? ??? ????? ???? ????? ??????. 1. ??? ?? ???? ????, ?? ??? ?? ?? ??? ????? (??? ?? C? std :: atomic? ?????). 2. ? ???? ??? ?? ? ?? ?? ???? ?? ???. 3. ??? ?? ??? ???? ???? ??? ????? ?? ? ??? ????? ??????. 4. ?????,? ?? ??? ?? ????? ?? ?? ??? ??? ?? ?? ?? ???? ?????. 5. ??? ?? ?? ??? ?? ? ? ??? ??? ??? ??? ??? ????.

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C??, POD (PANDALDATA) ??? ??? ??? ?? ??? ???? C ?? ??? ??? ?????. ??? ? ?? ??? ????????. ??? ??? ?? ???? ???, ?? memcpy? ?? ?? ? ? ????. ?? ????? ?? ??? ??? ??? ? ????. ?? ?? ???? ??? ?????. ?? ? ?? ??? ??, ??? ?? ??? ?? ???, ?? ?? ?? ?? ??? ?? ? ?? ? ?? ?? ??? ?????. ?? ?? structpoint {intx; inty;}? pod???. ??? ???? ???? I/O, C ?? ???, ?? ??? ?? ?????. std :: is_pod? ?? ??? POD?? ??? ? ??? C 11 ??? std :: is_trivia? ???? ?? ????.

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C?? Python Code? ????? ?? ???? ??? ? ?? ???, ?? ?? ?? ??? ???? ?? ??? ?? ? ? ????. 1. Py_Initialize ()? ?????? ????? py_finalize ()? ????. 2. pyrun_simplefile? ???? ??? ?? ?? pyrun_simplefile? ?????. 3. pyimport_importmodule? ?? ?? ?? ??, pyobject_getattrstring? ?? ??? ???? py_buildvalue? ?? ??? ???? ??? ???? ???? ??

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