/* NOTE: This is an internal header file, included by other STL headers.*   You should not attempt to use it directly.*/#ifndef __SGI_STL_INTERNAL_CONSTRUCT_H
#define __SGI_STL_INTERNAL_CONSTRUCT_H#include <new.h>__STL_BEGIN_NAMESPACE// construct and destroy.  These functions are not part of the C++ standard,
// and are provided for backward compatibility with the HP STL.  We also
// provide internal names _Construct and _Destroy that can be used within
// the library, so that standard-conforming pieces don't have to rely on
// non-standard extensions.// Internal names

template <class _T1, class _T2>
inline void _Construct(_T1* __p, const _T2& __value)
{new ((void*) __p) _T1(__value);
}template <class _T1>
inline void _Construct(_T1* __p)
{new ((void*) __p) _T1();
}//第一版本，接受一个指针,好说，直接调用析构函数全部析构
template <class _Tp>
inline void _Destroy(_Tp* __pointer)
{__pointer->~_Tp();
}//以下是destroy()第二版本，接受两个迭代器，只删除一部分值，该函数设法找出元素的数值型别，进而利用__type_traits<>求取最适当措施
template <class _ForwardIterator>
inline void _Destroy(_ForwardIterator __first, _ForwardIterator __last) {__destroy(__first, __last, __VALUE_TYPE(__first));
}//判断元素的数值型别(value_type)是否有trivial destructor
template <class _ForwardIterator, class _Tp>
inline void
__destroy(_ForwardIterator __first, _ForwardIterator __last, _Tp*)
{typedef typename __type_traits<_Tp>::has_trivial_destructor_Trivial_destructor;__destroy_aux(__first, __last, _Trivial_destructor());
}//如果元素型别为non-trivial destructor(有意义)，逐一删除元素
template <class _ForwardIterator>
void
__destroy_aux(_ForwardIterator __first, _ForwardIterator __last, __false_type)
{for ( ; __first != __last; ++__first)destroy(&*__first);
}//如果元素型别为trivial destructor(无伤大雅)，什么也不做
template <class _ForwardIterator>
inline void __destroy_aux(_ForwardIterator, _ForwardIterator, __true_type) {}inline void _Destroy(char*, char*) {}
inline void _Destroy(int*, int*) {}
inline void _Destroy(long*, long*) {}
inline void _Destroy(float*, float*) {}
inline void _Destroy(double*, double*) {}
#ifdef __STL_HAS_WCHAR_T
inline void _Destroy(wchar_t*, wchar_t*) {}
#endif /* __STL_HAS_WCHAR_T */// --------------------------------------------------
// Old names from the HP STL.
//HP STL以前旧的函数命名
template <class _T1, class _T2>
inline void construct(_T1* __p, const _T2& __value)
{_Construct(__p, __value);
}template <class _T1>
inline void construct(_T1* __p)
{_Construct(__p);
}template <class _Tp>
inline void destroy(_Tp* __pointer){_Destroy(__pointer);
}template <class _ForwardIterator>
inline void destroy(_ForwardIterator __first, _ForwardIterator __last){_Destroy(__first, __last);
}__STL_END_NAMESPACE#endif /* __SGI_STL_INTERNAL_CONSTRUCT_H */// Local Variables:
// mode:C++
// End: