24 Containers library [containers]

24.3 Sequence containers [sequences]

24.3.14 Class template inplace_vector [inplace.vector]

24.3.14.5 Modifiers [inplace.vector.modifiers]

constexpr iterator insert(const_iterator position, const T& x);
constexpr iterator insert(const_iterator position, T&& x);
constexpr iterator insert(const_iterator position, size_type n, const T& x);
template<class InputIterator>
  constexpr iterator insert(const_iterator position, InputIterator first, InputIterator last);
template<container-compatible-range<T> R>
  constexpr iterator insert_range(const_iterator position, R&& rg);
constexpr iterator insert(const_iterator position, initializer_list<T> il);

template<class... Args>
  constexpr iterator emplace(const_iterator position, Args&&... args);
template<container-compatible-range<T> R>
  constexpr void append_range(R&& rg);

Let n be value of size() before this call for the append_range overload, and distance(begin, position) otherwise.

Complexity: Linear in the number of elements inserted plus the distance to the end of the vector.

Remarks: If an exception is thrown other than by the copy constructor, move constructor, assignment operator, or move assignment operator of T or by any InputIterator operation, there are no effects.

Otherwise, if an exception is thrown, then size() ≥ n and elements in the range begin() + [0, n) are not modified.

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constexpr reference push_back(const T& x);
constexpr reference push_back(T&& x);
template<class... Args>
  constexpr reference emplace_back(Args&&... args);

Returns: back().

Throws: bad_alloc or any exception thrown by initialization of inserted element.

Complexity: Constant.

Remarks: If an exception is thrown, there are no effects on *this.

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template<class... Args>
  constexpr pointer try_emplace_back(Args&&... args);
constexpr pointer try_push_back(const T& x);
constexpr pointer try_push_back(T&& x);

Let vals denote a pack:

(8.1)
std::forward<Args>(args)... for the first overload,
(8.2)
x for the second overload,
(8.3)
std::move(x) for the third overload.

Preconditions: value_type is Cpp17EmplaceConstructible into inplace_vector from vals....

Effects: If size() < capacity() is true, appends an object of type T direct-non-list-initialized with vals....

Otherwise, there are no effects.

Returns: nullptr if size() == capacity() is true, otherwise addressof(back()).

Throws: Nothing unless an exception is thrown by initialization of inserted element.

Complexity: Constant.

Remarks: If an exception is thrown, there are no effects on *this.

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template<container-compatible-range<T> R>
  constexpr ranges::borrowed_iterator_t<R> try_append_range(R&& rg);

Preconditions: value_type is Cpp17EmplaceConstructible into inplace_vector from

*ranges::begin(rg).

Effects: Appends copies of initial elements in rg before end(), until all elements are inserted or size() == capacity() is true.

Each iterator in the range rg is dereferenced at most once.

Returns: An iterator pointing to the first element of rg that was not inserted into *this, or ranged::end(rg) if no such element exists.

Complexity: Linear in the number of elements inserted.

Remarks: Let n be the value of size() prior to this call.

If an exception is thrown after the insertion of k elements, then size() equals

n + k

, elements in the range begin() + [0, n) are not modified, and elements in the range begin() + [n,

n + k

) correspond to the inserted elements.

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template<class... Args>
  constexpr reference unchecked_emplace_back(Args&&... args);

Preconditions: size() < capacity() is true.

Effects: Equivalent to: return *try_emplace_back(std::forward<Args>(args)...);

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constexpr reference unchecked_push_back(const T& x);
constexpr reference unchecked_push_back(T&& x);

Preconditions: size() < capacity() is true.

Effects: Equivalent to: return *try_push_back(std::forward<decltype(x)>(x));

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static constexpr void reserve(size_type n);

Effects: None.

Throws: bad_alloc if n > capacity() is true.

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static constexpr void shrink_to_fit() noexcept;

Effects: None.

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constexpr iterator erase(const_iterator position);
constexpr iterator erase(const_iterator first, const_iterator last);
constexpr void pop_back();

Effects: Invalidates iterators and references at or after the point of the erase.

Throws: Nothing unless an exception is thrown by the assignment operator or move assignment operator of T.

Complexity: The destructor of T is called the number of times equal to the number of the elements erased, but the assignment operator of T is called the number of times equal to the number of elements after the erased elements.