C++ - Can you explain the term "resource acquisition is initialization?"

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Can you explain the term "resource acquisition is initialization?"

Total Answers and Comments: 2

Last Update: September 23, 2009 Asked by: suman

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October 07, 2005 01:08:38

subbu4u

Member Since: October 2005 Contribution: 1

RE: Can you explain the term "resource acquisition is ...

Resource Acquisition is Initialisation or shortly RAII is a term closely connected with exception handling and automatic garbage collection(speaking loosely). RAII is defined as the technique of performing all necessary resource initialisation work right within the body of the constructor itself and correspondingly doing all the deallocation within the destructor. Since during exception handling destructors of all the classes whose constructors have been successfully invoked are called therefore all the local objects previously allocated are automatically deallocated without explicitly calling their destructors.the following example explains the RAII technique:class X{ int *r; public: X(){cout<< X is created ; r new int[10]; } ~X(){cout<< X is destroyed ; delete [] r; }};class Y{ public: Y(){ X x; throw 44; } ~Y(){cout<< Y is destroyed ;}};Now since Y throws an exception right in its constructor therefore its destructor won't get called becuse the constructor was not invoked successfully. But the destructor of the class X will definitely be called and therefore the array 'r' will be deallocated. So we didn't have to care about resource deallocation at the time exceptions are raised.

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September 23, 2009 04:02:24

vidhudatta

Member Since: September 2009 Contribution: 4

RE: Can you explain the term "resource acquisition is initialization?"

It is the technique of performing all the necessary resource allocation in constructor only and all the cleanind in the destructor.

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