machine_epsilon() [1/2]

mpreal mpfr::machine_epsilon ( const mpreal & x )

inline

Definition at line 2093 of file mpreal.h.

{
    /* the smallest eps such that x + eps != x */
    if( x < 0)
    {
        return nextabove(-x) + x;
    }else{
        return nextabove( x) - x;
    }
}

References machine_epsilon(), nextabove(), and x.