What is the standard of review for appeal against a general demurrer?

"The standard of review on appeal following the sustaining of a demurrer is de novo. [Citation.] 'In reviewing the sufficiency of a complaint against a general demurrer, we are guided by long-settled rules. "We treat the demurrer as admitting all material facts properly pleaded, but not contentions, deductions or conclusions of fact or law. [Citation.] We also consider matters which may be judicially noticed." [Citation.] Further, we give the complaint a reasonable interpretation, reading it as a whole and its parts in their context.' " (Hervey v. Mercury Casualty Co. (2010) 185 Cal.App.4th 954, 960.) These rules apply in determining the threshold issue of standing. (Ibid.)