assume_aligned() [1/2]

template<size_t _Align, class _Tp>

_Tp * std::assume_aligned ( _Tp * __ptr )

nodiscardconstexprnoexcept

Inform the compiler that a pointer is aligned.

Template Parameters

_Align	An alignment value (i.e. a power of two)
_Tp	An object type

Parameters

__ptr

A pointer that is aligned to _Align

C++20 20.10.6 [ptr.align]

Definition at line 90 of file align.h.

    {
      static_assert(std::has_single_bit(_Align));
      if (std::is_constant_evaluated())
      return __ptr;
      else
      {
        // This function is expected to be used in hot code, where
        // __glibcxx_assert would add unwanted overhead.
        _GLIBCXX_DEBUG_ASSERT((__UINTPTR_TYPE__)__ptr % _Align == 0);
        return static_cast<_Tp*>(__builtin_assume_aligned(__ptr, _Align));
      }
    }

References _GLIBCXX_DEBUG_ASSERT, and assume_aligned().

Referenced by assume_aligned().

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