Opt.getXTolAbs

import std.algorithm : cmp;

auto opt = Opt(Algorithm.auglag, 2);

double[] test = [1e-4, 1e-4];
opt.setXTolAbs(test);

double[] val = [0, 0];
opt.getXTolAbs(val);

auto result = cmp(val[], test[]);

assert(result == 0);

import std.algorithm : cmp;

auto opt = Opt(Algorithm.auglag, 2);

opt.setXTolAbs(1e-4);

double[] val = [0, 0];
opt.getXTolAbs(val);

double[] test = [1e-4, 1e-4];
auto result = cmp(val[], test[]);

assert(result == 0);