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New posts in undefined-behavior
When does returning an rvalue reference result in undefined behavior?
Feb 04, 2026
c++
c++11
undefined-behavior
rvalue-reference
When is it fair to purposefully cause undefined behaviour? [closed]
Jan 31, 2026
c++
libraries
undefined-behavior
contract
When can I get away with not declaring int with signed?
Jan 30, 2026
c
types
printf
undefined-behavior
Undefined behavior or memory leak when using placement-new
Jan 28, 2026
c++
memory-leaks
undefined-behavior
placement-new
when are the assignment operators inside a parenthesis in a expression evaluated in c? [duplicate]
Jan 28, 2026
c
undefined-behavior
assignment-operator
parentheses
operator-precedence
Is it Undefined Behavior to backport namespace std features to older C++ versions?
Jan 27, 2026
c++
language-lawyer
std
undefined-behavior
Which undefined behavior allows this optimization?
Jan 25, 2026
c++
undefined-behavior
Why does a mismatching printf specifier also affect subsequent arguments?
Jan 24, 2026
c
printf
undefined-behavior
variadic-functions
calling-convention
How can unions be used to bypass strict aliasing violations?
Jan 23, 2026
c
undefined-behavior
unions
strict-aliasing
At which exact statement does this program exhibit Undefined behavior as per the C++ standard?
Jan 22, 2026
c++
undefined-behavior
Putting 'noexcept' on possible UB
Jan 21, 2026
c++
function
undefined-behavior
noexcept
Reference to a temporary variable - why doesn't compiler detect it?
Jan 18, 2026
c++
compiler-warnings
undefined-behavior
Does gcc initialize long strings to `""` but not short ones?
Jan 20, 2026
c
gcc
undefined-behavior
C++ access violation in msvc but not gcc for multiple inheritance and cast
Jan 02, 2026
c++
undefined-behavior
virtual-inheritance
memory-layout
type-punning
Initializing an array of trivially_copyable but not default_constructible objects from bytes. Confusion in [intro.object]
Jan 02, 2026
c++
language-lawyer
undefined-behavior
strict-aliasing
Javascript Can't Call Push On Array Inside Another Function [duplicate]
Jan 02, 2026
javascript
arrays
function
push
undefined-behavior
Could deleting complete class type result in undefined behavior?
Dec 30, 2025
c++
undefined-behavior
Accessing a struct member from what is not the same struct type
Dec 24, 2025
c
pointers
struct
undefined-behavior
Example of undefined behaviour involving the use of const_cast
Dec 22, 2025
c++
gcc
constants
compiler-optimization
undefined-behavior
Why output of array to pointer is not related
Dec 22, 2025
c++
arrays
pointers
scope
undefined-behavior
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