Covariance and contravariance in delegates 委托中的協(xié)變和逆變c
Covariance and contravariance in delegates c programming guide 委托中的協(xié)變和逆變( c #編程指南)
C programming guide covariance and contravariance in delegates c programming guide 委托中的協(xié)變和逆變( c #編程指南)
Covariance and contravariance 協(xié)變和逆變
Contravariance permits a method with parameter types that are less derived than in the delegate type 當(dāng)委托方法的返回類型具有的派生程度比委托簽名更大時(shí),就稱為協(xié)變委托方法。
Because of the addition of filling agent , some characteristics of polyterafluoethylene are greatly improved , especially on abrasion resistance , heat conductivity , contravariance and self lubrication , which are obviously better than pure polytetrafluoethylene products 由于填充劑的加入,從而大大改善了聚四氟乙烯的某些特性,特別是耐磨耗、導(dǎo)熱、抗蠕變、自潤(rùn)滑方面比純聚四氟乙烯制品有較明顯的改善。