What is the simplest way to convert array to vector

Question

What is the simplest way to convert array to vector   void test vector lt int gt   array             int x 3   1  2  3   test x      Syntax error    I want to convert x from int array to vector in simplest way

User · Answer

Pointers can be used like any other iterators   int x 3     1  2  3   std  vector lt int gt  v x  x   3   test v

User · Answer

One simple way can be the use of assign   function that is pre-defined in vector class   e g    array 5   1 2 3 4 5    vector lt int gt  v  v assign array  array 5      5 is size of array

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Personally  I quite like the C  2011 approach because it neither requires you to use sizeof   nor to remember adjusting the array bounds if you ever change the array bounds  and you can define the relevant function in C  2003 if you want  too     include  lt iterator gt   include  lt vector gt  int x       1  2  3  4  5    std  vector lt int gt  v std  begin x   std  end x      Obviously  with C  2011 you might want to use initializer lists anyway   std  vector lt int gt  v   1  2  3  4  5

User · Answer

You re asking the wrong question here - instead of forcing everything into a vector ask how you can convert test to work with iterators instead of a specific container  You can provide an overload too in order to retain compatibility  and handle other containers at the same time for free    void test const std  vector lt int gt  amp  in         Iterate over vector and do whatever     becomes   template  lt typename Iterator gt  void test Iterator begin  const Iterator end           Iterate over range and do whatever    template  lt typename Container gt  void test const Container amp  in        test std  begin in   std  end in        Which lets you do   int x 3   1  2  3   test x      Now correct    Ideone demo

User · Answer

Use the vector constructor that takes two iterators  note that pointers are valid iterators  and use the implicit conversion from arrays to pointers   int x 3     1  2  3   std  vector lt int gt  v x  x   sizeof x   sizeof x 0    test v     or  test std  vector lt int gt  x  x   sizeof x   sizeof x 0       where sizeof x   sizeof x 0  is obviously 3 in this context  it s the generic way of getting the number of elements in an array  Note that x   sizeof x   sizeof x 0  points one element beyond the last element

[c++] What is the simplest way to convert array to vector?

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