#include 
     
      #include 
      
       #include 
       
        /*template< std::size_t Len, std::size_t Align = default-alignment >struct::type aligned_storage;相当于一个内建的POD类型他的大小是Size他的对齐方式是Align */template
        
         class static_vector{    typename std::aligned_storage
         
          ::type data[N];    std::size_t m_size = 0;public:    //类似于vector的push_back，使用了变长模板参数    //和placement new    template
          
            void emplace_back(Args&&... args) { if (m_size >= N) throw std::bad_alloc{}; new(data + m_size) T(std::forward
           
            (args)...); ++m_size; } const T & operator[](std::size_t pos) const { const T * ret = reinterpret_cast
            
             (data + pos); return *ret; } ~static_vector() { for (std::size_t pos = 0; pos < m_size; ++pos) reinterpret_cast
             
              (data + pos)->~T(); }};int _tmain(int argc, _TCHAR* argv[]){ std::cout << __alignof(std::string) << std::endl; static_vector
              
                v1; v1.emplace_back(5, '*'); v1.emplace_back(10, '*'); std::cout << v1[0] << '\n' << v1[1] << '\n'; return 0;}