08 2021 档案

Effective C++ 笔记 —— Item 12: Copy all parts of an object.
摘要：Consider: class Date { }; // for dates in time class Customer { public: //... // as before private: std::string name; Date lastTransaction; }; class P 阅读全文
posted @ 2021-08-31 10:51 MyCPlusPlus 阅读(59) 评论(0) 推荐(0)
Effective C++ 笔记 —— Item 11: Handle assignment to self in operator=.
摘要：An assignment to self occurs when an object is assigned to itself: class Widget { ... }; Widget w; //... w = w; // assignment to self If you try to ma 阅读全文
posted @ 2021-08-31 10:50 MyCPlusPlus 阅读(86) 评论(0) 推荐(0)
Effective C++ 笔记 —— Item 10: Have assignment operators return a reference to *this.
摘要：For this code: int x, y, z; x = y = z = 15; // chain of assignments The way this is implemented is that assignment returns a reference to its left-han 阅读全文
posted @ 2021-08-30 11:22 MyCPlusPlus 阅读(73) 评论(0) 推荐(0)
Effective C++ 笔记 —— Item 9: Never call virtual functions during construction or destruction.
摘要：If Transaction had multiple constructors, each of which had to perform some of the same work, it would be good software engineering to avoid code repl 阅读全文
posted @ 2021-08-30 11:03 MyCPlusPlus 阅读(94) 评论(0) 推荐(0)
Effective C++ 笔记 —— Item 8: Prevent exceptions from leaving destructors.
摘要：Destructors should never emit exceptions. If functions called in a destructor may throw, the destructor should catch any exceptions, then swallow them 阅读全文
posted @ 2021-08-28 15:22 MyCPlusPlus 阅读(60) 评论(0) 推荐(0)
Effective C++ 笔记 —— Item 7: Declare destructors virtual in polymorphic base classes.
摘要：If a class does not contain virtual functions, that often indicates it is not meant to be used as a base class. When a class is not intended to be a b 阅读全文
posted @ 2021-08-27 10:14 MyCPlusPlus 阅读(78) 评论(0) 推荐(0)
Effective C++ 笔记 —— Item 6: Explicitly disallow the use of compiler-generated functions you do not want.
摘要：To disallow functionality automatically provided by compilers: 1. declare the corresponding member functions private and give no implementations. clas 阅读全文
posted @ 2021-08-26 20:11 MyCPlusPlus 阅读(50) 评论(0) 推荐(0)
Aspect Ratio —— PAR DAR SAR
摘要：PAR (Pixel Aspect Ratio)，像素的宽高比 大多数情况像素宽高比为1:1，也就是一个正方形像素，如果不是1:1， 则可以理解为长方形像素。常用的PAR比率有(1:1，10:11, 40:33, 16:11, 12:11 )。 DAR (Display Aspect Ratio)， 阅读全文
posted @ 2021-08-14 12:04 MyCPlusPlus 阅读(995) 评论(0) 推荐(0)