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4011. "Effects: Equivalent to return" in [span.elem]

Section: 23.7.2.2.6 [span.elem] Status: WP Submitter: Arthur O'Dwyer Opened: 2023-11-09 Last modified: 2024-04-02

Priority: Not Prioritized

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Discussion:

In reviewing the wording for P2821 span.at(), it had been noticed that 23.7.2.2.6 [span.elem] uses a lot of "Effects: Equivalent to return […];" which could be simply "Returns: […]".

For comparison, 27.3.3.6 [string.view.access] uses "Returns: ..." instead, so I suggest that 23.7.2.2.6 [span.elem] should be consistent with that.

[2024-03-11; Reflector poll]

Set status to Tentatively Ready after seven votes in favour during reflector poll.

[Tokyo 2024-03-23; Status changed: Voting → WP.]

Proposed resolution:

This wording is relative to N4964.

1. Modify 23.7.2.2.6 [span.elem] as indicated:

   constexpr reference operator[](size_type idx) const;
   

   -1- Preconditions: idx < size() is true.

   -2- EffectsReturns: Equivalent to: return *(data() + idx);.

   -?- Throws: Nothing.

   constexpr reference front() const;
   

   -3- Preconditions: empty() is false.

   -4- EffectsReturns: Equivalent to: return *data();.

   -?- Throws: Nothing.

   constexpr reference back() const;
   

   -5- Preconditions: empty() is false.

   -6- EffectsReturns: Equivalent to: return *(data() + (size() - 1));.

   -?- Throws: Nothing.

   constexpr pointer data() const noexcept;
   

   -7- EffectsReturns: Equivalent to: return data_;.