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New posts in undefined-behavior
C output changed by adding a printf
Oct 18, 2025
c
debugging
printf
undefined-behavior
Why don't define some undefined behaviours?
Oct 18, 2025
c++
undefined-behavior
Is not catching an exception undefined behavior?
Oct 17, 2025
c++
exception
language-lawyer
destructor
undefined-behavior
Undefined behavior when constexpr-evaluating negative bitshift?
Oct 17, 2025
c++
undefined-behavior
bit-shift
constexpr
Is using std::span into an std::vector after push_back is called undefined behavior
Sep 23, 2025
c++
vector
undefined-behavior
ownership-semantics
std-span
How to access an object representation according to the c++ standard?
Sep 21, 2025
c++
pointers
object
language-lawyer
undefined-behavior
How to check if a string passed as argument is a modifiable string
Sep 20, 2025
c
string
assert
undefined-behavior
string-literals
Is returning a pointer to a local variable always undefined behavior [duplicate]
Sep 18, 2025
c++
function
pointers
local
undefined-behavior
Should a boolean predicate for std::condition_variable be volatile in C++?
Sep 16, 2025
c++
multithreading
c++11
undefined-behavior
std
Is it technically UB to static_cast<A*>(memmove(dst, (void*)src, sizeof(src))) since C++20?
Sep 15, 2025
c++
language-lawyer
c++20
undefined-behavior
lifetime
Difference between array and pointer to string literal
Sep 17, 2025
c
memory-management
undefined-behavior
Is casting `the address of a pointer to a struct` to `the address of a struct whos first member is a pointer to the struct` UB?
Sep 15, 2025
c++
undefined-behavior
reinterpret-cast
pointer-conversion
Does undefined behavior only concern an execution of program, or can it concern a program itself?
Sep 15, 2025
c++
language-lawyer
undefined-behavior
Can I "over-extend" an array by allocating more space to the enclosing struct?
Sep 15, 2025
c
arrays
language-lawyer
undefined-behavior
flexible-array-member
Why is optimization forbidden if a C compiler cannot prove lack of UB?
Sep 15, 2025
c
optimization
compiler-optimization
undefined-behavior
integer-overflow
Generating prefix bitmasks
Sep 15, 2025
c++
c
bit-manipulation
undefined-behavior
branchless
Undefined behaviour in (X)HTML?
Sep 13, 2025
html
xhtml
undefined-behavior
Is std::begin on an empty std::valarray undefined behavior?
Sep 12, 2025
c++
undefined-behavior
libstdc++
valarray
Examples using reinterpret_cast that do not trigger UB
Sep 12, 2025
c++
undefined-behavior
reinterpret-cast
strict-aliasing
Why doesn't strict aliasing rule apply to int* and unsigned*?
Sep 10, 2025
c
language-lawyer
compiler-optimization
undefined-behavior
strict-aliasing
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