bool Object_FTC_Manager::DoDirProp(Environment &env, SymbolSet &symbols)
{
    Signal &sig = GetSignal();
    if (!Object::DoDirProp(env, symbols)) return false;
#if 0
    symbols.insert(Gura_Symbol(x));
    symbols.insert(Gura_Symbol(y));
#endif
    return true;
}

Value Object_FTC_Manager::DoGetProp(Environment &env, const Symbol *pSymbol,
                                    const SymbolSet &attrs, bool &evaluatedFlag)
{
    evaluatedFlag = true;
#if 0
    if (pSymbol->IsIdentical(Gura_Symbol(x))) {
        return Value(_vector.x);
    } else if (pSymbol->IsIdentical(Gura_Symbol(y))) {
        return Value(_vector.y);
    }
#endif
    evaluatedFlag = false;
    return Value::Nil;
}

Gura_ImplementPropertyGetter(Solver_Summary, nonlinear_conjugate_gradient_type)
{
	const ceres::Solver::Summary &summary = Object_Solver_Summary::GetObject(valueThis)->GetSummary();
	return attrs.IsSet(Gura_Symbol(name))?
		Value(ceres::NonlinearConjugateGradientTypeToString(summary.nonlinear_conjugate_gradient_type)) :
		Value(summary.nonlinear_conjugate_gradient_type);
}

//-----------------------------------------------------------------------------
// Implementation of class methods
//-----------------------------------------------------------------------------
// gmp.mpf.get_defaul_prec()
Gura_DeclareClassMethod(mpf, get_default_prec)
{
	SetFuncAttr(VTYPE_any, RSLTMODE_Normal, FLAG_None);
	AddHelp(
		Gura_Symbol(en),
		"Gets the default precision for `gmp.mpf`.\n");
}

// ml.linear.model.get_nr_class()
Gura_DeclareMethod(model, get_nr_class)
{
	SetFuncAttr(VTYPE_any, RSLTMODE_Normal, FLAG_None);
	AddHelp(
		Gura_Symbol(en),
		"");
}

// fs.Stat#issock
Gura_DeclareProperty_R(Stat, issock)
{
	SetPropAttr(VTYPE_boolean);
	AddHelp(
		Gura_Symbol(en),
		""
		);
}

// ceres.Solver$Summary#preconditioner_type_used
Gura_DeclareProperty_RW(Solver_Summary, preconditioner_type_used)
{
	SetPropAttr(VTYPE_number);
	AddHelp(
		Gura_Symbol(en),
		""
		);
}