Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
478 views
in Technique[技术] by (71.8m points)

syntax - What is the meaning of & in c++?

I want to know the meaning of & in the example below:

class1 &class1::instance(){

///something to do

}
See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

The & operator has three meanings in C++.

  • "Bitwise AND", e.g. 2 & 1 == 3
  • "Address-of", e.g.: int x = 3; int* ptr = &x;
  • Reference type modifier, e.g. int x = 3; int& ref = x;

Here you have a reference type modifier. Your function class1 &class1::instance() is a member function of type class1 called instance, that returns a reference-to-class1. You can see this more clearly if you write class1& class1::instance() (which is equivalent to your compiler).


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

Just Browsing Browsing

[4] html - How to create even cell spacing within a

1.4m articles

1.4m replys

5 comments

56.8k users

...