Introduction to C++ Standard Library Class Template vector

Creating vector Objects

By default, all elements of each vector object are set to 0.

ex.
  vector< int > integer1( 7 );

vector Member Function size; Function outputVector

every container except forward_List

ex.
  cout << "Size of vector integers1 is " << integer1.size()
    << "\nvector after initialization:" << endl;
  outputVector( integers1 );

Function outputVector

ex.
 inputVector( integers1 );

Comparing vector Objects for Inequality

ex.
if ( integers1 != integers2 )
  cout << "integers1 and integers2 are not equal " << endl;

Initializing One vector with Contents of Another

ex.
vector< int > integers3( integers1 );

Assigning vectors and comparing vectors for Equality

ex.
integers1 = integers2
integers1 == integers2

Using the [] Operator to Access and Modify vector Elements

Standard class template vector provides bounds checking in its member function at()

ex.
cout << "\nintegers1[5] is " << integers1[ 5 ] = 1000;
cout << integers1.at( 15 ) << endl;

Changing the Size of a vector

other than array and forward_list

integers3.push_back( 1000 );

vector Member Function capacity

specific to vector and deque

ex.

cout << "\nThe initial capacity of integers is: " << integers.capacity();

Outputting vector Contents with Iterators

ex.
1. C++11

for ( auto constIterator = integers2.cbegin(); constIterator != integers2.cend(); ++constIterator  )
  cout << *constIterator << ' ';

could have been replace with the following range-based for statement:

for ( auto const &item : integers2 )
  cout << item << '';

2. prior to C+11

vector<int>::const_iterator

Displaying the vector's Content in Reverse with const_reverse_iterators

for ( auto reverseIterator = integers2.crbegin(); reverseIterator != integers2.crend(); ++reverseIterator  )
  cout << *reverseIterator << ' ';

C++11: shrink_to_fit

std::vector<int> myvector (100); 

  cout << "1. capacity of myvector: " << myvector.capacity() << '\n'; 

myvector.resize(10); 

  cout << "2. capacity of myvector: " << myvector.capacity() << '\n'; 

myvector.shrink_to_fit(); 

  cout << "3. capacity of myvector: " << myvector.capacity() << '\n';

vector Element-Manipulation Functions

vector< int > integers{ 1, 2, 3, 4, 5, 6 };

or

vector< int > integers = {1, 2, 3, 4, 5, 6 };

using an overloaded vector constructor that takes two as arguments to initialize integers

array< int, SIZE > value = { 1, 2, 3, 4, 5, 6 }
vector< int > integers( value.cbegin(), values.cend() );