dclcs / cppfeatures Goto Github PK

• ... 接受多个参数， 表示一组/包东西(pack)
  • 用于template parameter => template parameter pack
  • 用于function parameter types => function parameter type pack
  • 用于function parameters => function parameter pack
• Inside variadic templates , sizeof...(args) yields the number of arguments
• 作用
  • 递归
  • 继承

   vector<list<int> > // Ok in each C++ version
   vector<list<int>> //Ok since C++11

• nullptr 空指针 = 0/NULL

void f(int);
void f(void*);

f(0); //call f(int)
f(NULL); //calls f(int) if NULL is 0
f(nullptr); //calls f(void*)

Using auto is especially useful where the type is pretty long and/or complicated expression.