Vector Dev C++

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Vector Dev C++ Average ratng: 5,8/10 9816 votes

C++ Vector Tutorial
Dev C++ Online
C++ Vector Of Vectors Int

The C Standard Library

The C++ Standard Library

The C++ STL Library

C++ Programming Resources

C Vector Library - pushback Function - The C function std::vector::pushback inserts new element at the end of vector and increases size of vector by one. Libraries can implement different strategies for growth to balance between memory usage and reallocations, but in any case, reallocations should only happen at logarithmically growing intervals of size so that the insertion of individual elements at the end of the vector can be provided with amortized constant time complexity (see pushback). DaVinci Developer - Design AUTOSAR Software Components. DaVinci Developer is a tool for designing the architecture of software components (SWCs) for AUTOSAR ECUs. In C, we talk about vectors, rather than arrays. Vectors are declared with the following syntax: vector variablename (numberofelements); The number of elements is optional. You could declare it like this: vector variablename; And that would declare an empty vector — a vector that contains zero elements. In this tutorial, we are going to focus on Sorting a Vector in C. Sorting is one of the vastly performed operations in any programming language. Similarly, in C too, there are several algorithms following which we can sort any data structure.

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Description

The C++ function std::vector::push_back() inserts new element at the end of vector and increases size of vector by one.

Declaration

Following is the declaration for std::vector::push_back() function form std::vector header.

C++98

C++11

Parameters

None

Return value

None.

Exceptions

This member function never throws exception.

Time complexity

Constant i.e. O(1)

Example

The following example shows the usage of std::vector::push_back() function.

Let us compile and run the above program, this will produce the following result −

vector.htm

The C Standard Library

The C++ Standard Library

The C++ STL Library

C++ Programming Resources

Selected Reading

C++ Vector Tutorial

Introduction

Vectors are sequence container that can change size. Container is a objects that hold data of same type. Sequence containers store elements strictly in linear sequence.

Vector stores elements in contiguous memory locations and enables direct access to any element using subscript operator []. Unlike array, vector can shrink or expand as needed at run time. The storage of the vector is handled automatically.

To support shrink and expand functionality at runtime, vector container may allocate some extra storage to accommodate for possible growth thus container have actual capacity greater than the size. Therefore, compared to array, vector consumes more memory in exchange for the ability to manage storage and grow dynamically in an efficient way.

Zero sized vectors are also valid. In that case vector.begin() and vector.end() points to same location. But behavior of calling front() or back() is undefined.

Definition

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Below is definition of std::vector from <vector> header file

Parameters

T − Type of the element contained.
T may be substituted by any other data type including user-defined type.
Alloc − Type of allocator object.
By default, the allocator class template is used, which defines the simplest memory allocation model and is value-independent.

Member types

Following member types can be used as parameters or return type by member functions.

Sr.No.	Member types	Definition
1	value_type	T (First parameter of the template)
2	allocator_type	Alloc (Second parameter of the template)
3	reference	value_type&
4	const_reference	const value_type&
5	pointer	value_type*
6	const_pointer	const value_type*
7	iterator	a random access iterator to value_type
8	const_iterator	a random access iterator to const value_type
9	reverse_iterator	std::reverse_iterator <iterator>
10	const_reverse_iterator	std::reverse_iterator <const_iterator>
11	size_type	size_t
12	difference_type	ptrdiff_t

Functions from <vector>

Below is list of all methods from <vector> header.

Constructors

Sr.No.	Method & Description
1	vector::vector`default constructor` Constructs an empty container, with zero elements.
2	vector::vector`fill constructor` Constructs a container with `n` elements and assignd `val` to each element.
3	vector::vector`range constructor` Constructs a container with as many elements in range of `first` to `last.`
4	vector::vector`copy constructor` Constructs a container with copy of each elements present in existing container `x.`
5	vector::vector`move constructor` Constructs the container with the contents of other using `move` semantics.
6	vector::vector`initializer list constructor` Constructs a container from initializer list.

Destructor

Sr.No.	Method & Description
1	vector::~vector Destroys container by deallocating container memory.

C++ Vector Of Vectors Int

Member functions

Sr.No.	Method & Description
1	vector::assign`fill version` Assign new values to the vector elements by replacing old ones.
2	vector::assign`range version` Assign new values to the vector elements by replacing old ones.
3	vector::assign`initializer list version` Assign new values to the vector elements by replacing old ones.
4	vector::at Returns reference to the element present at location `n` in the vector.
5	vector::back Returns a reference to the last element of the vector.
6	vector::begin Return a random access iterator pointing to the first element of the vector.
7	vector::capacity Returns the size of allocate storage, expressed in terms of elements.
8	vector::cbegin Returns a constant random access iterator which points to the beginning of the vector.
9	vector::cend Returns a constant random access iterator which points to the beginning of the vector.
10	vector::clear Destroys the vector by removing all elements from the vector and sets size of vector to zero.
11	vector::crbegin Returns a constant reverse iterator which points to the reverser beginning of the container.
12	vector::crend Returns a constant reverse iterator which points to the reverse end of the vector.
13	vector::data Returns a pointer to the first element of the vector container.
14	vector::emplace Extends container by inserting new element at `position`.
15	vector::emplace_back Inserts new element at the end of vector.
16	vector::empty Tests whether vector is empty or not.
17	vector::end Returns an iterator which points to `past-the-end element` in the vector container.
18	vector::erase `position version` Removes single element from the the vector.
19	vector::erase `range version` Removes single element from the the vector.
20	vector::front Returns a reference to the first element of the vector. Antares Auto-Tune Pro v9.1.0 WINSize 110 MbAuto-Tune Pro The Professional Standard for Pitch CorrectionAuto-Tune Pro is the most complete and advanced edition of Auto-Tune.
21	vector::get_allocator Returns an allocator associated with vector. Traktor 2 pro file tag vs playlist tagalog.
22	vector::insert`single element version` Extends iterator by inserting new element at `position.`
23	vector::insert`fill version` Extends vector by inserting new element in the container.
24	vector::insert`range version` Extends vector by inserting new element in the container.
25	vector::insert`move version` Extends vector by inserting new element in the container.
26	vector::insert`initializer list version` Extends vector by inserting new element in the container.
27	vector::max_size Returns the maximum number of elements can be held by vector.
28	vector::operator=`copy version` Assign new contents to the vector by replacing old ones and modifies size if necessary.
29	vector::operator=`move version` Assign new contents to the vector by replacing old ones and modifies size if necessary.
30	vector::operator =`initializer list version` Assign new contents to the vector by replacing old ones and modifies size if necessary.
31	vector::operator[] Returns a reference to the element present at location `n`.
32	vector::pop_back Removes last element from vector and reduces size of vector by one.
33	vector::push_back Inserts new element at the end of vector and increases size of vector by one.
34	vector::rbegin Returns a reverse iterator which points to the last element of the vector.
35	vector::rend Returns a reverse iterator which points to the reverse end of the vector.
36	vector::reserve Requests to reserve vector capacity be at least enough to contain `n` elements.
37	vector::resize Changes the size of vector.
38	vector::shrink_to_fit Requests the container to reduce it's capacity to fit its size.
39	vector::size Returns the number of elements present in the vector.
40	vector::swap Exchanges the content of vector with contents of vector `x`.

Non-member overloaded functions

Sr.No.	Method & Description
1	operator Tests whether two vectors are equal or not.
2	operator != Tests whether two vectors are equal or not.
3	operator < Tests whether first vector is less than other or not.
4	operator <= Tests whether first vector is less than or equal to other or not.
5	operator > Tests whether first vector is greater than other or not.
6	operator >= Tests whether first vector is greater than or equal to other or not.
7	swap Exchanges the contents of two vector.