std::vector< _Tp, _Alloc >(3cxx) | std::vector< _Tp, _Alloc >(3cxx) |
NAME¶
std::vector< _Tp, _Alloc > -SYNOPSIS¶
Inherits std::_Vector_base< _Tp, _Alloc >.Public Types¶
typedef _Alloc allocator_type
Public Member Functions¶
void assign (size_type __n, const value_type &__val)
Protected Member Functions¶
_Tp_alloc_type::pointer _M_allocate (size_t __n)
Protected Attributes¶
_Vector_impl _M_impl
Detailed Description¶
template<typename _Tp, typename _Alloc = std::allocator<_Tp>>class std::vector< _Tp, _Alloc >¶
A standard container which offers fixed time access to individual elements in any order.Constructor & Destructor Documentation¶
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> std::vector< _Tp, _Alloc >::vector () [inline]¶
Default constructor creates no elements. Definition at line 207 of file stl_vector.h.template<typename _Tp, typename _Alloc = std::allocator<_Tp>> std::vector< _Tp, _Alloc >::vector (const allocator_type &__a) [inline], [explicit]¶
Creates a vector with no elements. Parameters:a An allocator object.
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> std::vector< _Tp, _Alloc >::vector (size_type__n, const value_type &__value = value_type(), const allocator_type &__a = allocator_type()) [inline], [explicit]¶
Creates a vector with copies of an exemplar element. Parameters:n The number of elements to initially
create.
value An element to copy.
a An allocator.
This constructor fills the vector with n copies of value.
Definition at line 227 of file stl_vector.h.
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> std::vector< _Tp, _Alloc >::vector (const vector< _Tp, _Alloc > &__x) [inline]¶
Vector copy constructor. Parameters:x A vector of identical element and
allocator types.
The newly-created vector uses a copy of the allocation object used by x.
All the elements of x are copied, but any extra memory in x (for
fast expansion) will not be copied.
Definition at line 241 of file stl_vector.h.
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> std::vector< _Tp, _Alloc >::vector ( vector< _Tp, _Alloc > &&__x) [inline]¶
Vector move constructor. Parameters:x A vector of identical element and
allocator types.
The newly-created vector contains the exact contents of x. The contents
of x are a valid, but unspecified vector.
Definition at line 257 of file stl_vector.h.
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> std::vector< _Tp, _Alloc >::vector ( initializer_list< value_type >__l, const allocator_type &__a = allocator_type()) [inline]¶
Builds a vector from an initializer list. Parameters:l An initializer_list.
a An allocator.
Create a vector consisting of copies of the elements in the
initializer_list l.
This will call the element type's copy constructor N times (where N is
l.size()) and do no memory reallocation.
Definition at line 271 of file stl_vector.h.
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> template<typename _InputIterator > std::vector< _Tp, _Alloc >:: vector (_InputIterator__first, _InputIterator__last, const allocator_type &__a = allocator_type()) [inline]¶
Builds a vector from a range. Parameters:first An input iterator.
last An input iterator.
a An allocator.
Create a vector consisting of copies of the elements from [first,last).
If the iterators are forward, bidirectional, or random-access, then this will
call the elements' copy constructor N times (where N is distance(first,last))
and do no memory reallocation. But if only input iterators are used, then this
will do at most 2N calls to the copy constructor, and logN memory
reallocations.
Definition at line 297 of file stl_vector.h.
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> std::vector< _Tp, _Alloc >::~vector () [inline]¶
The dtor only erases the elements, and note that if the elements themselves are pointers, the pointed-to memory is not touched in any way. Managing the pointer is the user's responsibility. Definition at line 312 of file stl_vector.h.Member Function Documentation¶
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> template<typename _ForwardIterator > pointer std::vector< _Tp, _Alloc >::_M_allocate_and_copy (size_type__n, _ForwardIterator__first, _ForwardIterator__last) [inline], [protected]¶
Memory expansion handler. Uses the member allocation function to obtain n bytes of memory, and then copies [first,last) into it. Definition at line 960 of file stl_vector.h.template<typename _Tp, typename _Alloc = std::allocator<_Tp>> void std::vector< _Tp, _Alloc >::_M_range_check (size_type__n) const [inline], [protected]¶
Safety check used only from at(). Definition at line 631 of file stl_vector.h.template<typename _Tp, typename _Alloc = std::allocator<_Tp>> void std::vector< _Tp, _Alloc >::assign (size_type__n, const value_type &__val) [inline]¶
Assigns a given value to a vector. Parameters:n Number of elements to be assigned.
val Value to be assigned.
This function fills a vector with n copies of the given value. Note that
the assignment completely changes the vector and that the resulting vector's
size is the same as the number of elements assigned. Old data may be lost.
Definition at line 374 of file stl_vector.h.
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> template<typename _InputIterator > void std::vector< _Tp, _Alloc >::assign (_InputIterator__first, _InputIterator__last) [inline]¶
Assigns a range to a vector. Parameters:first An input iterator.
last An input iterator.
This function fills a vector with copies of the elements in the range
[first,last).
Note that the assignment completely changes the vector and that the resulting
vector's size is the same as the number of elements assigned. Old data may be
lost.
Definition at line 391 of file stl_vector.h.
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> void std::vector< _Tp, _Alloc >::assign ( initializer_list< value_type >__l) [inline]¶
Assigns an initializer list to a vector. Parameters:l An initializer_list.
This function fills a vector with copies of the elements in the initializer list
l.
Note that the assignment completely changes the vector and that the resulting
vector's size is the same as the number of elements assigned. Old data may be
lost.
Definition at line 411 of file stl_vector.h.
Referenced by std::vector< std::sub_match< _Bi_iter >, _Allocator
>::assign().
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> reference std::vector< _Tp, _Alloc >::at (size_type__n) [inline]¶
Provides access to the data contained in the vector. Parameters:n The index of the element for which
data should be accessed.
Returns:
Read/write reference to data.
Exceptions:
std::out_of_range If
n is an invalid index.
This function provides for safer data access. The parameter is first checked
that it is in the range of the vector. The function throws out_of_range
if the check fails.
Definition at line 650 of file stl_vector.h.
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> const_reference std::vector< _Tp, _Alloc >::at (size_type__n) const [inline]¶
Provides access to the data contained in the vector. Parameters:n The index of the element for which
data should be accessed.
Returns:
Read-only (constant) reference to data.
Exceptions:
std::out_of_range If
n is an invalid index.
This function provides for safer data access. The parameter is first checked
that it is in the range of the vector. The function throws out_of_range
if the check fails.
Definition at line 668 of file stl_vector.h.
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> reference std::vector< _Tp, _Alloc >::back () [inline]¶
Returns a read/write reference to the data at the last element of the vector. Definition at line 695 of file stl_vector.h.template<typename _Tp, typename _Alloc = std::allocator<_Tp>> const_reference std::vector< _Tp, _Alloc >::back () const [inline]¶
Returns a read-only (constant) reference to the data at the last element of the vector. Definition at line 703 of file stl_vector.h.template<typename _Tp, typename _Alloc = std::allocator<_Tp>> iterator std::vector< _Tp, _Alloc >::begin () [inline]¶
Returns a read/write iterator that points to the first element in the vector. Iteration is done in ordinary element order. Definition at line 425 of file stl_vector.h. Referenced by __gnu_parallel::multiseq_partition(), __gnu_parallel::multiseq_selection(), __gnu_parallel::multiway_merge_exact_splitting(), std::vector< _Tp, _Alloc >::operator=(), std::operator==(), __gnu_parallel::parallel_sort_mwms_pu(), and std::vector< std::sub_match< _Bi_iter >, _Allocator >::vector().template<typename _Tp, typename _Alloc = std::allocator<_Tp>> const_iterator std::vector< _Tp, _Alloc >::begin () const [inline]¶
Returns a read-only (constant) iterator that points to the first element in the vector. Iteration is done in ordinary element order. Definition at line 434 of file stl_vector.h.template<typename _Tp, typename _Alloc = std::allocator<_Tp>> size_type std::vector< _Tp, _Alloc >::capacity () const [inline]¶
Returns the total number of elements that the vector can hold before needing to allocate more memory. Definition at line 565 of file stl_vector.h.template<typename _Tp, typename _Alloc = std::allocator<_Tp>> const_iterator std::vector< _Tp, _Alloc >::cbegin () const [inline]¶
Returns a read-only (constant) iterator that points to the first element in the vector. Iteration is done in ordinary element order. Definition at line 498 of file stl_vector.h.template<typename _Tp, typename _Alloc = std::allocator<_Tp>> const_iterator std::vector< _Tp, _Alloc >::cend () const [inline]¶
Returns a read-only (constant) iterator that points one past the last element in the vector. Iteration is done in ordinary element order. Definition at line 507 of file stl_vector.h.template<typename _Tp, typename _Alloc = std::allocator<_Tp>> void std::vector< _Tp, _Alloc >::clear () [inline]¶
Erases all the elements. Note that this function only erases the elements, and that if the elements themselves are pointers, the pointed-to memory is not touched in any way. Managing the pointer is the user's responsibility. Definition at line 950 of file stl_vector.h.template<typename _Tp, typename _Alloc = std::allocator<_Tp>> const_reverse_iterator std::vector< _Tp, _Alloc >::crbegin () const [inline]¶
Returns a read-only (constant) reverse iterator that points to the last element in the vector. Iteration is done in reverse element order. Definition at line 516 of file stl_vector.h.template<typename _Tp, typename _Alloc = std::allocator<_Tp>> const_reverse_iterator std::vector< _Tp, _Alloc >::crend () const [inline]¶
Returns a read-only (constant) reverse iterator that points to one before the first element in the vector. Iteration is done in reverse element order. Definition at line 525 of file stl_vector.h.template<typename _Tp, typename _Alloc = std::allocator<_Tp>> pointer std::vector< _Tp, _Alloc >::data () [inline]¶
Returns a pointer such that [ data(), data() + size()) is a valid range. For a non-empty vector, data() == &front(). Definition at line 714 of file stl_vector.h.template<typename _Tp , typename _Alloc > template<typename... _Args> vector< _Tp, _Alloc >::iterator vector::emplace (iterator__position, _Args &&...__args)¶
Inserts an object in vector before specified iterator. Parameters:position An iterator into the vector.
args Arguments.
Returns:
An iterator that points to the inserted
data.
This function will insert an object of type T constructed with
T(std::forward<Args>(args)...) before the specified location. Note that
this kind of operation could be expensive for a vector and if it is frequently
used the user should consider using std::list.
Definition at line 272 of file vector.tcc.
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> bool std::vector< _Tp, _Alloc >::empty () const [inline]¶
Returns true if the vector is empty. (Thus begin() would equal end().) Definition at line 574 of file stl_vector.h.template<typename _Tp, typename _Alloc = std::allocator<_Tp>> iterator std::vector< _Tp, _Alloc >::end () [inline]¶
Returns a read/write iterator that points one past the last element in the vector. Iteration is done in ordinary element order. Definition at line 443 of file stl_vector.h. Referenced by __gnu_parallel::multiseq_partition(), __gnu_parallel::multiseq_selection(), std::vector< _Tp, _Alloc >::operator=(), std::operator==(), __gnu_parallel::parallel_sort_mwms_pu(), and std::vector< std::sub_match< _Bi_iter >, _Allocator >::vector().template<typename _Tp, typename _Alloc = std::allocator<_Tp>> const_iterator std::vector< _Tp, _Alloc >::end () const [inline]¶
Returns a read-only (constant) iterator that points one past the last element in the vector. Iteration is done in ordinary element order. Definition at line 452 of file stl_vector.h.template<typename _Tp , typename _Alloc > vector< _Tp, _Alloc >::iterator vector::erase (iterator__position)¶
Remove element at given position. Parameters:position Iterator pointing to element
to be erased.
Returns:
An iterator pointing to the next element (or
end()).
This function will erase the element at the given position and thus shorten the
vector by one.
Note This operation could be expensive and if it is frequently used the user
should consider using std::list. The user is also cautioned that this
function only erases the element, and that if the element is itself a pointer,
the pointed-to memory is not touched in any way. Managing the pointer is the
user's responsibility.
Definition at line 134 of file vector.tcc.
template<typename _Tp , typename _Alloc > vector< _Tp, _Alloc >::iterator vector::erase (iterator__first, iterator__last)¶
Remove a range of elements. Parameters:first Iterator pointing to the first
element to be erased.
last Iterator pointing to one past the last element to be erased.
Returns:
An iterator pointing to the element pointed to
by last prior to erasing (or end()).
This function will erase the elements in the range [first,last) and shorten the
vector accordingly.
Note This operation could be expensive and if it is frequently used the user
should consider using std::list. The user is also cautioned that this
function only erases the elements, and that if the elements themselves are
pointers, the pointed-to memory is not touched in any way. Managing the
pointer is the user's responsibility.
Definition at line 146 of file vector.tcc.
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> reference std::vector< _Tp, _Alloc >::front () [inline]¶
Returns a read/write reference to the data at the first element of the vector. Definition at line 679 of file stl_vector.h.template<typename _Tp, typename _Alloc = std::allocator<_Tp>> const_reference std::vector< _Tp, _Alloc >::front () const [inline]¶
Returns a read-only (constant) reference to the data at the first element of the vector. Definition at line 687 of file stl_vector.h.template<typename _Tp , typename _Alloc > vector< _Tp, _Alloc >::iterator vector::insert (iterator__position, const value_type &__x)¶
Inserts given value into vector before specified iterator. Parameters:position An iterator into the vector.
x Data to be inserted.
Returns:
An iterator that points to the inserted
data.
This function will insert a copy of the given value before the specified
location. Note that this kind of operation could be expensive for a vector and
if it is frequently used the user should consider using std::list.
Definition at line 107 of file vector.tcc.
References std::move().
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> iterator std::vector< _Tp, _Alloc >::insert (iterator__position, value_type &&__x) [inline]¶
Inserts given rvalue into vector before specified iterator. Parameters:position An iterator into the vector.
x Data to be inserted.
Returns:
An iterator that points to the inserted
data.
This function will insert a copy of the given rvalue before the specified
location. Note that this kind of operation could be expensive for a vector and
if it is frequently used the user should consider using std::list.
Definition at line 815 of file stl_vector.h.
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> void std::vector< _Tp, _Alloc >::insert (iterator__position, initializer_list< value_type >__l) [inline]¶
Inserts an initializer_list into the vector. Parameters:position An iterator into the vector.
l An initializer_list.
This function will insert copies of the data in the initializer_list
l into the vector before the location specified by position.
Note that this kind of operation could be expensive for a vector and if it is
frequently used the user should consider using std::list.
Definition at line 832 of file stl_vector.h.
Referenced by std::vector< std::sub_match< _Bi_iter >, _Allocator
>::insert().
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> void std::vector< _Tp, _Alloc >::insert (iterator__position, size_type__n, const value_type &__x) [inline]¶
Inserts a number of copies of given data into the vector. Parameters:position An iterator into the vector.
n Number of elements to be inserted.
x Data to be inserted.
This function will insert a specified number of copies of the given data before
the location specified by position.
Note that this kind of operation could be expensive for a vector and if it is
frequently used the user should consider using std::list.
Definition at line 850 of file stl_vector.h.
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> template<typename _InputIterator > void std::vector< _Tp, _Alloc >::insert (iterator__position, _InputIterator__first, _InputIterator__last) [inline]¶
Inserts a range into the vector. Parameters:position An iterator into the vector.
first An input iterator.
last An input iterator.
This function will insert copies of the data in the range [first,last) into the
vector before the location specified by pos.
Note that this kind of operation could be expensive for a vector and if it is
frequently used the user should consider using std::list.
Definition at line 869 of file stl_vector.h.
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> size_type std::vector< _Tp, _Alloc >::max_size () const [inline]¶
Returns the size() of the largest possible vector. Definition at line 537 of file stl_vector.h.template<typename _Tp , typename _Alloc > vector< _Tp, _Alloc > & vector::operator= (const vector< _Tp, _Alloc > &__x)¶
Vector assignment operator. Parameters:x A vector of identical element and
allocator types.
All the elements of x are copied, but any extra memory in x (for
fast expansion) will not be copied. Unlike the copy constructor, the allocator
object is not copied.
Definition at line 157 of file vector.tcc.
References std::_Destroy(), std::vector< _Tp, _Alloc >::begin(),
std::vector< _Tp, _Alloc >::end(), and std::vector< _Tp, _Alloc
>::size().
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> vector& std::vector< _Tp, _Alloc >::operator= ( vector< _Tp, _Alloc > &&__x) [inline]¶
Vector move assignment operator. Parameters:x A vector of identical element and
allocator types.
The contents of x are moved into this vector (without copying). x
is a valid, but unspecified vector.
Definition at line 336 of file stl_vector.h.
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> vector& std::vector< _Tp, _Alloc >::operator= ( initializer_list< value_type >__l) [inline]¶
Vector list assignment operator. Parameters:l An initializer_list.
This function fills a vector with copies of the elements in the initializer list
l.
Note that the assignment completely changes the vector and that the resulting
vector's size is the same as the number of elements assigned. Old data may be
lost.
Definition at line 356 of file stl_vector.h.
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> reference std::vector< _Tp, _Alloc >::operator[] (size_type__n) [inline]¶
Subscript access to the data contained in the vector. Parameters:n The index of the element for which
data should be accessed.
Returns:
Read/write reference to data.
This operator allows for easy, array-style, data access. Note that data access
with this operator is unchecked and out_of_range lookups are not
defined. (For checked lookups see at().)
Definition at line 610 of file stl_vector.h.
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> const_reference std::vector< _Tp, _Alloc >::operator[] (size_type__n) const [inline]¶
Subscript access to the data contained in the vector. Parameters:n The index of the element for which
data should be accessed.
Returns:
Read-only (constant) reference to data.
This operator allows for easy, array-style, data access. Note that data access
with this operator is unchecked and out_of_range lookups are not
defined. (For checked lookups see at().)
Definition at line 625 of file stl_vector.h.
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> void std::vector< _Tp, _Alloc >::pop_back () [inline]¶
Removes last element. This is a typical stack operation. It shrinks the vector by one. Note that no data is returned, and if the last element's data is needed, it should be retrieved before pop_back() is called. Definition at line 764 of file stl_vector.h.template<typename _Tp, typename _Alloc = std::allocator<_Tp>> void std::vector< _Tp, _Alloc >::push_back (const value_type &__x) [inline]¶
Add data to the end of the vector. Parameters:x Data to be added.
This is a typical stack operation. The function creates an element at the end of
the vector and assigns the given data to it. Due to the nature of a vector
this operation can be done in constant time if the vector has preallocated
space available.
Definition at line 733 of file stl_vector.h.
Referenced by __gnu_parallel::multiseq_partition(), and
__gnu_parallel::multiseq_selection().
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> reverse_iterator std::vector< _Tp, _Alloc >::rbegin () [inline]¶
Returns a read/write reverse iterator that points to the last element in the vector. Iteration is done in reverse element order. Definition at line 461 of file stl_vector.h.template<typename _Tp, typename _Alloc = std::allocator<_Tp>> const_reverse_iterator std::vector< _Tp, _Alloc >::rbegin () const [inline]¶
Returns a read-only (constant) reverse iterator that points to the last element in the vector. Iteration is done in reverse element order. Definition at line 470 of file stl_vector.h.template<typename _Tp, typename _Alloc = std::allocator<_Tp>> reverse_iterator std::vector< _Tp, _Alloc >::rend () [inline]¶
Returns a read/write reverse iterator that points to one before the first element in the vector. Iteration is done in reverse element order. Definition at line 479 of file stl_vector.h.template<typename _Tp, typename _Alloc = std::allocator<_Tp>> const_reverse_iterator std::vector< _Tp, _Alloc >::rend () const [inline]¶
Returns a read-only (constant) reverse iterator that points to one before the first element in the vector. Iteration is done in reverse element order. Definition at line 488 of file stl_vector.h.template<typename _Tp , typename _Alloc > void vector::reserve (size_type__n)¶
Attempt to preallocate enough memory for specified number of elements. Parameters:n Number of elements required.
Exceptions:
std::length_error If
n exceeds max_size().
This function attempts to reserve enough memory for the vector to hold the
specified number of elements. If the number requested is more than
max_size(), length_error is thrown.
The advantage of this function is that if optimal code is a necessity and the
user can determine the number of elements that will be required, the user can
reserve the memory in advance, and thus prevent a possible reallocation of
memory and copying of vector data.
Definition at line 65 of file vector.tcc.
References std::_Destroy().
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> void std::vector< _Tp, _Alloc >::resize (size_type__new_size, value_type__x = value_type()) [inline]¶
Resizes the vector to the specified number of elements. Parameters:new_size Number of elements the vector
should contain.
x Data with which new elements should be populated.
This function will resize the vector to the specified number of elements. If the
number is smaller than the vector's current size the vector is truncated,
otherwise the vector is extended and new elements are populated with given
data.
Definition at line 552 of file stl_vector.h.
Referenced by __gnu_parallel::multiway_merge_exact_splitting(),
__gnu_parallel::parallel_sort_mwms(), and __gnu_parallel::shrink_and_double().
template<typename _Tp, typename _Alloc = std::allocator<_Tp>> size_type std::vector< _Tp, _Alloc >::size () const [inline]¶
Returns the number of elements in the vector. Definition at line 532 of file stl_vector.h. Referenced by __gnu_parallel::list_partition(), std::vector< _Tp, _Alloc >::operator=(), std::operator==(), __gnu_parallel::shrink(), and __gnu_parallel::shrink_and_double().template<typename _Tp, typename _Alloc = std::allocator<_Tp>> void std::vector< _Tp, _Alloc >::swap ( vector< _Tp, _Alloc > &&__x) [inline]¶
Swaps data with another vector. Parameters:x A vector of the same element and
allocator types.
This exchanges the elements between two vectors in constant time. (Three
pointers, so it should be quite fast.) Note that the global std::swap()
function is specialized such that std::swap(v1,v2) will feed to this function.
Definition at line 927 of file stl_vector.h.
Referenced by std::swap().
Author¶
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