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New posts in undefined-behavior

Does casting to an unrelated reference type violate the strict aliasing rule?

c++ language-lawyer undefined-behavior reinterpret-cast strict-aliasing

Unexpected memcpy on uncopyable & unmovable type when using co_await

c++ undefined-behavior copy-elision c++-coroutine

C++23 range-based for loop lifetime fixes interraction with `std::generator` arguments

c++ for-loop generator undefined-behavior c++23

Is use of uninitialized static object well-defined in C++?

c++ initialization undefined-behavior

Rust FFI and Aliasing: C -> Rust -> C -> Rust call stacks with C values being aliased: Undefined Behaviour?

rust undefined-behavior ffi

How does casting and calling obj_msgSend() not invoke undefined behavior?

c objective-c function-pointers undefined-behavior objc-message-send

std::bit_cast padding and undefined behavior

c++ language-lawyer c++20 undefined-behavior bit-cast

Is dereference null pointer UB in C++20?

c++ language-lawyer c++20 undefined-behavior

Is the use of unknown escape sequence invokes undefined behavior in C++?

c++ special-characters undefined-behavior

Little endian and overwriting memory location

c memory undefined-behavior endianness

Is a conversion from a double to a float always potentially invoking undefined behaviour?

c floating-point standards undefined-behavior c99

Is it guaranteed that all forms of Undefined Behavior are caught when evaluating a constant expression

c++ language-lawyer undefined-behavior evaluation

All programs were UB before C++20?

c++ language-lawyer c++20 undefined-behavior

Can you return an integer by dereferencing a pointer?

c++ pointers undefined-behavior

Is the behaviour of std::chrono::round on out-of-range values as intended?

c++ c++17 rounding undefined-behavior c++-chrono

When is an erroneous value not valid for the object's type?

c++ language-lawyer undefined-behavior c++26 erroneous-behavior

How to correctly use std::arch::_mm_loadu_si128 / _mm_storeu_si128

rust undefined-behavior simd memory-alignment
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