[BEGINNER] new keyword

[Last Timer]

I was asked in an interview if using new can we assign memory at a
known address. If yes, does it mean new operator can be overloaded like
others?

Thanks for your response

 

[Thomas Matthews]

I was asked in an interview if using new can we assign memory at a
known address. If yes, does it mean new operator can be overloaded like
others?

Thanks for your response

Yes, yes. See the FAQ below.

--
Thomas Matthews

C++ newsgroup welcome message:
http://www.slack.net/~shiva/welcome.txt
C++ Faq: http://www.parashift.com/c++-faq-lite
C Faq: http://www.eskimo.com/~scs/c-faq/top.html
alt.comp.lang.learn.c-c++ faq:
http://www.comeaucomputing.com/learn/faq/
Other sites:
http://www.josuttis.com -- C++ STL Library book
http://www.sgi.com/tech/stl -- Standard Template Library

 

[Rolf Magnus]

I was asked in an interview if using new can we assign memory at a
known address.
Yes.

If yes, does it mean new operator can be overloaded like others?

Yes.

 

[Last Timer]

Checked the FAQ. Can someone please give examples of how new can be
overloaded/assign memory at a known address.

Thanks

 

[Peter Koch Larsen]

Checked the FAQ. Can someone please give examples of how new can be
overloaded/assign memory at a known address.

Thanks

void* adress = ... ;
myclass *mc = new(adress) myclass(...);

/Peter

 

[Kanenas]

void* adress = ... ;
myclass *mc = new(adress) myclass(...);

/Peter

This use of the new operator Peter shows is called "placement new" and
is covered in the C++ FAQ LITE in the section on destructors. If you
wish to use placement new, these portions of the FAQ are highly
recommended reading.

[11.10] What is "placement new" and why would I use it?
http://www.parashift.com/c++-faq-lite/dtors.html#faq-11.10

[11.14] Is there a way to force new to allocate memory from a specific
memory area?
http://www.parashift.com/c++-faq-lite/dtors.html#faq-11.14

 

[Howard]

This use of the new operator Peter shows is called "placement new" and
is covered in the C++ FAQ LITE in the section on destructors.

Funny place to put info on object construction, in the section on
destructors...
-H