这两个free(NULL)和::operator delete(NULL)是允许的.分配器概念(例如std :: allocator是否允许deallocate(NULL,1),或者是否需要自己保护它？
free(NULL)
::operator delete(NULL)
deallocate(NULL,1)
c++ free null memory-management allocator
allocator ×1
c++ ×1
free ×1
memory-management ×1
null ×1