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New posts in undefined-behavior
Why does Deducing-This lambda require `this` to be a reference or capturing variables by reference?
Feb 17, 2026
c++
recursion
lambda
undefined-behavior
c++23
Does start_lifetime_as forbid access to original buffer?
Feb 15, 2026
c++
language-lawyer
undefined-behavior
lifetime
type-punning
Is it legal Rust to cast a pointer to a struct's first member to a pointer to the struct?
Feb 13, 2026
rust
language-lawyer
undefined-behavior
Implications of not assigning the return value of a function to a variable
Feb 08, 2026
c++
stack
undefined-behavior
Wrong constructor being called causes segmentation fault
Feb 08, 2026
c++
linker
undefined-behavior
one-definition-rule
Why v[i] = i++ is undefined behavior in C?
Feb 08, 2026
c
undefined-behavior
Is undefined behavior changing a literal array?
Feb 07, 2026
c
arrays
pointers
undefined-behavior
Is it possible for a programming language to confidently prevent undefined behavior on stack overflow?
Feb 07, 2026
assembly
programming-languages
stack-overflow
undefined-behavior
callstack
Why is this not a memory leak in C++?
Feb 06, 2026
c++
memory-leaks
valgrind
undefined-behavior
unique-ptr
C++ sequence points and changes to evaluation order in C++17 [duplicate]
Feb 06, 2026
c++
c++17
undefined-behavior
sequence-points
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
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