How can I insert element into beginning of vector?

Question

I need to insert values into the beginning of a std::vector and I need other values in this vector to be pushed to further positions for example: something adde

Answer 1

You can insert values to std::vector from back and then use std::reverse:

Example:

#include 
#include 
#include 

void printVector( std::vector< int > const & _vector )
{
    for( auto value : _vector )
    {
         std::cout << value << " ";
    }

    std::cout << std::endl;
}

int main()
{
    std::vector< int > someVec;
    
    someVec.push_back( 5 );
    someVec.push_back( 4 );
    someVec.push_back( 3 );
    someVec.push_back( 2 );
    someVec.push_back( 1 );

    // (1)
    printVector( someVec );

    std::reverse( someVec.begin(), someVec.end() );
    
    // (2)
    printVector( someVec );

    return 0;
}

Output (1):

5 4 3 2 1 

Output (2):

1 2 3 4 5