How do I efficiently multiply a range of values of an array with a given number?

Question

The naive way would be to linearly iterate the range and multiply with each number in the range.

Example: Array: {1,2,3,4,5,6,7,8,9,10}; Multiply index 3 to index 8 wit

Answer 1

As far as I know the only way is to iterate through the vector, and apply the multiplication.

You could define a function like so:

void VecMultiply(std::vector& pVector, int Multiplier);

and implement it like:

void VecMultiply(std::vector& pVector, int Multiplier)
{
    for (unsigned int i = 0; i < pVector.size(); i++)
    {
        *pVector[i] *= Multiplier;
    }
}

Or you could even pass a vector of anything multiplied by anything using templates:

template
template
void VecMultiply(std::vector& pVector, M Multiplier)
    {
        for (unsigned int i = 0; i < pVector.size(); i++)
        {
            *pVector[i] *= Multiplier;
        }
    }