随笔分类 -  C++

LNK2019 的一种情况，需要限定友元所作用的实例化
摘要：正好在实现一个Vector2类型： template<typename T> struct Vector2; template<typename T> Vector2<T> operator+(const Vector2<T>& v1, const Vector2<T>& v2); template 阅读全文
posted @ 2021-04-21 10:30 威化饼干 阅读(8) 评论(0) 推荐(0)
C++随笔
摘要：虚析构函数是可以声明的，这意味着需要由于子类来实现接口的析构函数。 reference: https://blog.csdn.net/wufeifan_learner/article/details/88804072 class A{ public: A(){ cout<<"构造函数A"<<endl 阅读全文
posted @ 2021-03-24 23:56 威化饼干 阅读(6) 评论(0) 推荐(0)
reinterpret_cast and unIon cast 的区别
摘要：template < typename TO, typename FROM > inline TO union_cast( FROM value ) { union { FROM from; TO to; } convert; convert.from = value; return convert 阅读全文
posted @ 2021-02-02 18:23 威化饼干 阅读(255) 评论(0) 推荐(0)
Why does the C++ map type argument require an empty constructor when using []
摘要：Link to StackOverflow: Why does the C++ map type argument require an empty constructor when using [] by Nick Bolton? Q: Not a major issue, just annoyi 阅读全文
posted @ 2019-07-12 09:57 威化饼干 阅读(135) 评论(0) 推荐(0)
About The Order of The Declarations And Definition When Making a Member Function a Friend.关于使类成员成为另一个类友元函数的声明顺序和定义。
摘要：If only member function _clear_ of _WindowMgr_ is a friend of _Screen_, there are some points need to note. Sequence is important. First, define the _ 阅读全文
posted @ 2019-01-18 15:21 威化饼干 阅读(143) 评论(0) 推荐(0)
About Why Inline Member Function Should Defined in The Header File
摘要：About why inline member function should defined in the header file. It is legal to specify inline on both the declaration and the definition. But the 阅读全文
posted @ 2019-01-18 15:13 威化饼干 阅读(104) 评论(0) 推荐(0)