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最新评论
In my previous dicuss, we have seen the example of overloaded delete and new operator. and as a matter of fact, we have seen the following signature of the delete operator.
void operator delete(void *); void operator delete(void *, size_t size);
As you will soon find out that they both match the same new operator
void operator new (size_t);
but which one should we choose to use?
and even, you can define both the operator delete(void *) and the operator delete (void *, size_t) in the same class, and according to my test , in the placement operator overloading example, the "operator delete(void *)" has precedance over the "operator delete (void *, size_t)"....
so here is my rule of thme, we uses operator delete (void *, size_t size) when
- the size_t is not barely the size of the object (this could happen if the new operator has say, preallocate some space which is larger than what is required by the object itself.)
- the size_t is necessary to determine flows or it is necessary in the clean up that the delete operator is supposed to do.
- Booking and logging requirement.
- This can be thought as an extension to the point 2, where you can normally see allocated memory is larger than the object itself, is when you allocate a array (new [] operator actually does this)....
And when to use the operator delete (void *)?
- when the size of the pointer in the first parameter is exact the size of the object
- The size_t size is irrelevant in the deallocation flow.
发表评论
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不安装Visual Studio,只用Windows SDK搭建VC环境
2013-12-31 21:52 15283首先你需要下载的是 Microsoft Windows S ... -
rpath - runtime search path
2013-04-03 11:36 964RPath is a very interesting to ... -
C++ - autogenerated copy constructor and assignment operator gotchas
2013-01-24 13:32 744It has been changed that the s ... -
c++ - rethrow a exception gotchas
2012-12-23 10:57 919As in my prevoius example in j ... -
c++ -typeid operator
2012-10-15 22:30 1031typeid is the one of the meager ... -
c++ - dynamic_cast revisit
2012-10-14 21:21 735There are several built-in type ... -
c++ - virtual inheritance example 1
2012-10-14 15:25 783we have discussed the virtual i ... -
c++ - virtual inheritance
2012-10-12 08:58 913As we have discussed in the pos ... -
c++ type of inheritance
2012-09-28 08:58 721There are 3 types of inheritanc ... -
c++ - vritually virtual new
2012-09-27 23:59 930Let's see what if we want to cl ... -
c++ - virtual destructor
2012-09-27 22:01 923As we all know that virtual des ... -
c++ - vritual function and default arguments
2012-09-27 08:56 949As we all know that we virtual ... -
c++ - template specialization and partial specialization
2012-09-26 22:38 1285in this post, we are going to e ... -
c++ - member template in class template
2012-09-26 08:19 902class member template can be us ... -
c++ template class and the pattern to use its friends
2012-09-25 23:47 956template class may defined thei ... -
c++ - Friend declaration in class Template
2012-09-25 08:47 1180There are three kinds of friend ... -
c++ - class template default parameters
2012-09-25 08:18 800the template has parameter, it ... -
c++ - operator new and delete and an example of linked list stores by new/delete
2012-09-24 07:53 553The operator new and delete ope ... -
c++ - placement operator new() and the operator delete()
2012-09-23 15:22 836A class member operator new() c ... -
c++ - overloaded subscript operator - []
2012-09-23 08:50 1126You can overload the subscript ...
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