From Jason Turner

[uninitialized.construct.default]

C++17 → C++20 2.5 KB 55 lines
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Markdown: C++17 | C++20
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tmp/tmpb87hh9w2/{from.md → to.md} RENAMED
@@ -1,29 +1,63 @@
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- #### `uninitialized_default_construct` <a id="uninitialized.construct.default">[[uninitialized.construct.default]]</a>
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  ``` cpp
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- template <class ForwardIterator>
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- void uninitialized_default_construct(ForwardIterator first, ForwardIterator last);
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  ```
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  *Effects:* Equivalent to:
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  ``` cpp
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  for (; first != last; ++first)
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- ::new (static_cast<void*>(addressof(*first)))
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- typename iterator_traits<ForwardIterator>::value_type;
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  ```
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  ``` cpp
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- template <class ForwardIterator, class Size>
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- ForwardIterator uninitialized_default_construct_n(ForwardIterator first, Size n);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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  ```
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  *Effects:* Equivalent to:
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  ``` cpp
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  for (; n > 0; (void)++first, --n)
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- ::new (static_cast<void*>(addressof(*first)))
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- typename iterator_traits<ForwardIterator>::value_type;
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  return first;
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  ```
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+ ### `uninitialized_default_construct` <a id="uninitialized.construct.default">[[uninitialized.construct.default]]</a>
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  ``` cpp
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+ template<class NoThrowForwardIterator>
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+ void uninitialized_default_construct(NoThrowForwardIterator first, NoThrowForwardIterator last);
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  ```
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  *Effects:* Equivalent to:
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  ``` cpp
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  for (; first != last; ++first)
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+ ::new (voidify(*first))
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+ typename iterator_traits<NoThrowForwardIterator>::value_type;
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  ```
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  ``` cpp
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+ namespace ranges {
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+ template<no-throw-forward-iterator I, no-throw-sentinel<I> S>
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+ requires default_initializable<iter_value_t<I>>
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+ I uninitialized_default_construct(I first, S last);
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+ template<no-throw-forward-range R>
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+ requires default_initializable<range_value_t<R>>
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+ borrowed_iterator_t<R> uninitialized_default_construct(R&& r);
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+ }
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+ ```
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+
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+ *Effects:* Equivalent to:
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+
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+ ``` cpp
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+ for (; first != last; ++first)
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+ ::new (voidify(*first)) remove_reference_t<iter_reference_t<I>>;
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+ return first;
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+ ```
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+
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+ ``` cpp
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+ template<class NoThrowForwardIterator, class Size>
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+ NoThrowForwardIterator uninitialized_default_construct_n(NoThrowForwardIterator first, Size n);
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  ```
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  *Effects:* Equivalent to:
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  ``` cpp
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  for (; n > 0; (void)++first, --n)
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+ ::new (voidify(*first))
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+ typename iterator_traits<NoThrowForwardIterator>::value_type;
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  return first;
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  ```
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+ ``` cpp
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+ namespace ranges {
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+ template<no-throw-forward-iterator I>
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+ requires default_initializable<iter_value_t<I>>
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+ I uninitialized_default_construct_n(I first, iter_difference_t<I> n);
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+ }
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+ ```
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+
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+ *Effects:* Equivalent to:
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+
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+ ``` cpp
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+ return uninitialized_default_construct(counted_iterator(first, n),
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+ default_sentinel).base();
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+ ```
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+