mutable vector

[ryllprous]

What is a mutable vector and for what is it used? I attach a part of a code where it appears:

void Phase::getConcentrations(doublereal* const c) const
{
    scale(m_ym.begin(), m_ym.end(), c, m_dens);
}

where

mutable vector_fp m_ym;

Thanks,

Ramon

[Bingocat4]

http://lmgtfy.com/?q=c%2B%2B+mutable

[LB]

Why is that function even const in the first place? Why does its name start with "get" but it doesn't return anything?

[Lachlan Easton]

I'm guessing c is an output parameter.