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Questions tagged undefined-behavior

27 questions

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19
votes
5
answers

Why does a program accessing illegal pointer to pointer not crash?

c undefined-behavior
asked 2013-07-25T07:57:22.667
33
votes
10
answers

Why doesn't vector::clear remove elements from a vector?

c++ stdvector undefined-behavior
asked 2013-06-24T22:33:51.713
18
votes
1
answers

Does int a=1, b=a++; invoke undefined behavior?

c language-lawyer undefined-behavior sequence-points
asked 2013-04-25T15:39:32.713
31
votes
2
answers

What specific hash algorithm does MessageDigest.getInstance("SHA") return?

java cryptography undefined-behavior
asked 2013-02-15T21:23:48.830
10
votes
2
answers

Function equality and ordering in Erlang

erlang undefined-behavior ambiguity
asked 2012-10-25T20:52:59.827
8
votes
2
answers

Can one element of a tuple reference another?

c++ c++11 tuples undefined-behavior
asked 2012-07-26T18:25:42.910
11
votes
1
answers

Generic char[] based storage and avoiding strict-aliasing related UB

c++ c++11 undefined-behavior strict-aliasing type-punning
asked 2012-06-13T08:20:48.960
10
votes
4
answers

Why is not deleting an object that has a destructor with a side effect undefined behavior in C++11?

c++ memory-leaks c++11 destructor undefined-behavior
asked 2012-04-02T06:04:15.137
12
votes
2
answers

Defined behaviour for expressions

c undefined-behavior standards-compliance language-lawyer
asked 2012-01-29T19:30:20.310
15
votes
5
answers

Is Type name = name; ever useful in C++?

c++ variables initialization declaration undefined-behavior
asked 2011-08-01T12:03:50.800
13
votes
5
answers

Assigning a reference by dereferencing a NULL pointer

c++ pointers reference undefined-behavior null-pointer
asked 2011-07-16T07:40:53.553
10
votes
2
answers

Is `new (this) MyClass();` undefined behaviour after directly calling the destructor?

c++ this undefined-behavior placement-new
asked 2011-06-03T07:16:32.463
9
votes
4
answers

How do languages handle side effects of compound operators?

javascript c++ c programming-languages undefined-behavior
asked 2011-02-14T13:56:16.450
17
votes
2
answers

Fun with uninitialized variables and compiler (GCC)

c++ gcc initialization undefined-behavior
asked 2011-02-02T19:43:09.347
17
votes
2
answers

What's the difference in undefined behavior between C++03 and C++11?

c++ c++11 undefined-behavior c++03
asked 2010-12-07T17:22:41.297
1075
votes
6
answers

What are sequence points, and how do they relate to undefined behavior?

c++ undefined-behavior c++-faq sequence-points
asked 2010-11-14T05:37:46.333
46
votes
8
answers

const member and assignment operator. How to avoid the undefined behavior?

c++ constants undefined-behavior assignment-operator
asked 2010-11-09T16:42:45.020
10
votes
4
answers

const_cast and UB

c++ undefined-behavior const-cast
asked 2010-10-28T11:55:16.573
32
votes
11
answers

Can we change the value of an object defined with const through pointers?

c constants undefined-behavior
asked 2010-09-27T06:30:15.613
55
votes
8
answers

Why does left shift operation invoke Undefined Behaviour when the left side operand has negative value?

c++ c language-lawyer undefined-behavior bit-shift
asked 2010-09-24T07:26:22.233
35
votes
8
answers

Is this undefined C behaviour?

c undefined-behavior
asked 2010-08-10T15:25:45.157
13
votes
9
answers

How to spot undefined behavior

c++ c undefined-behavior
asked 2010-06-10T15:52:21.037
36
votes
9
answers

Division by zero: Undefined Behavior or Implementation Defined in C and/or C++?

c++ c undefined-behavior divide-by-zero
asked 2010-06-09T08:19:26.837
12
votes
6
answers

Does dereferencing deleted pointers always result in a crash?

c++ pointers visual-c++ crash undefined-behavior
asked 2010-05-24T10:29:53.660
30
votes
10
answers

How could pairing new[] with delete possibly lead to memory leak only?

c++ memory-management undefined-behavior
asked 2009-12-16T09:15:12.150
39
votes
6
answers

A question about union in C - store as one type and read as another - is it implementation defined?

c undefined undefined-behavior unions
asked 2009-11-28T11:54:31.480
927
votes
15
answers

Why are these constructs using pre and post-increment undefined behavior?

c increment undefined-behavior operator-precedence sequence-points
asked 2009-06-04T09:17:52.267