build/set_options.go
func (m ClearFlag) MutateSetOptions(o *xdr.SetOptionsOp) (err error) {
	if !isFlagValid(xdr.AccountFlags(m)) {
		return errors.New("Unknown flag in SetFlag mutator")
	}

	var val xdr.Uint32
	if o.ClearFlags == nil {
		val = xdr.Uint32(m)
	} else {
		val = xdr.Uint32(m) | *o.ClearFlags
	}
	o.ClearFlags = &val
	return
}
func (m ClearFlag) MutateSetOptions(o *xdr.SetOptionsOp) (err error) {
	if !isFlagValid(xdr.AccountFlags(m)) {
		return errors.New("Unknown flag in SetFlag mutator")
	}

	var val xdr.Uint32
	if o.ClearFlags == nil {
		val = xdr.Uint32(m)
	} else {
		val = xdr.Uint32(m) | *o.ClearFlags
	}
	o.ClearFlags = &val
	return
}
// MutateSetOptions for ClearFlag sets the SetOptionsOp's ClearFlags field