stl_construct.h
#ifndef __SGI_STL_INTERNAL_CONSTRUCT_H #define __SGI_STL_INTERNAL_CONSTRUCT_H #include <new.h> // 需要placement new的原型 __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(); } template <class _Tp> inline void _Destroy(_Tp* __pointer) { __pointer->~_Tp(); } template <class _ForwardIterator> void __destroy_aux(_ForwardIterator __first, _ForwardIterator __last, __false_type) { for ( ; __first != __last; ++__first) destroy(&*__first); } template <class _ForwardIterator> inline void __destroy_aux(_ForwardIterator, _ForwardIterator, __true_type) {} 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()); //是否为trivial destructor,避免影响效率 } template <class _ForwardIterator> inline void _Destroy(_ForwardIterator __first, _ForwardIterator __last) { __destroy(__first, __last, __VALUE_TYPE(__first)); } 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. 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 */
construct –>_Construct
destroy->_Destroy->__destroy->__destroy_aux