queue and exception

Hello everyone,


Just a basic question which I could not find answer from MSDN currently, for frequently used member functions for queue class, there is,

1. push;
2. pop;
3. back;
4. front.

I know (1) will throw exception, for example, out of memory. How about (2), (3) and (4)? Will they be possible to throw any exceptions and in what situations if there are exceptions? From MSDN declaration of exception specification for the functions, I can not find the answer.


thanks in advance,
George

Use SGI for a more detailed knowledge of the standard library: http://www.sgi.com/tech/stl/

Thanks Mario,


I read through, but no answer about whether exception will be thrown or not in the functions I listed in my question.

http://www.sgi.com/tech/stl/queue.html

Quote:

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Originally Posted by Mario F.

Use SGI for a more detailed knowledge of the standard library: http://www.sgi.com/tech/stl/

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regards,
George

If it doesn't say anything...

... you got it.

EDIT: Went there. Take a look when it mentions preconditions for the members. Usually preconditions are handled by exceptions in the STL.

The member functions pop(), back() and front() of std::queue will not throw any exceptions, but attempting to use them on an empty queue results in undefined behaviour.

Thanks laserlight,


Any push throws exception when there is bad_alloc? Are there any other situations?

Quote:

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Originally Posted by laserlight

The member functions pop(), back() and front() of std::queue will not throw any exceptions, but attempting to use them on an empty queue results in undefined behaviour.

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Hi Mario,


I searched the link you referred for "preconditions", but can not find related exception information. It is appreciated if you could point out.

Quote:

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Originally Posted by Mario F.

If it doesn't say anything...

... you got it.

EDIT: Went there. Take a look when it mentions preconditions for the members. Usually preconditions are handled by exceptions in the STL.

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regards,
George

Quote:

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Any push throws exception when there is bad_alloc? Are there any other situations?

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The copy constructor of the object pushed might throw.

Thanks CornedBee,


The root cause of the exception of copy constructor should be bad_alloc? Any other possibilities? User defined exception?

Quote:

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Originally Posted by CornedBee

The copy constructor of the object pushed might throw.

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regards,
George

User-defined. It depends on the type. A std::string might throw a bad_alloc if it can't allocate memory for the new string. Other classes might to something else.

Thanks CornedBee,


My question is answered.

Quote:

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Originally Posted by CornedBee

User-defined. It depends on the type. A std::string might throw a bad_alloc if it can't allocate memory for the new string. Other classes might to something else.

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regards,
George