C++ - Placement New Syntax

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Placement New Syntax

How can a C++ developer use the placement new syntax to make new allocate an object of class SomeClass at a particular memory address stored in a pointer type variable named pmem?

A. new SomeClass(pmem);
B. new(pmem) SomeClass;
C. new SomeClass pmem;
D. new pmem SomeClass;
E. new (pmem, SomeClass);

Total Answers and Comments: 3

Last Update: November 15, 2009 Asked by: dlee6565

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Best Rated Answer

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Submitted by: bfeingold

B. looks closest to correct. I would use:

SomeClass* ptr = new(pmem)SomeClass();

Above answer was rated as good by the following members:
yzesong, MercurySystemsEngineering, laetizia

July 29, 2009 17:51:56

bfeingold

Member Since: July 2009 Contribution: 2

RE: Placement New Syntax

B. looks closest to correct. I would use:

SomeClass* ptr new(pmem)SomeClass();

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Overall Rating: +3

October 13, 2009 13:47:20

krislogy

Member Since: October 2009 Contribution: 1

RE: Placement New Syntax

It is B provided pmem is an allocated pointer (meaning memory already allocated to it).

See this link for more explanation: http://www.geekinterview.com/question_details/16559

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Overall Rating: +1

November 14, 2009 17:02:41

tawofala

Member Since: November 2009 Contribution: 2

RE: Placement New Syntax

E. new (pmem SomeClass);

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