Why do people use __ (double underscore) so much in C++
c++, syntax
Solution
From Programming in C++, Rules and Recommendations :
The use of two underscores (`__') in identifiers is reserved for the compiler's internal use according to the ANSI-C standard.
Underscores (`_') are often used in names of library functions (such as "_main" and "_exit"). In order to avoid collisions, do not begin an identifier with an underscore.
Problem
I was taking a look through some open-source C++ code and I noticed a lot of double underscores used within in the code, mainly at the start of variable names. ``` return __CYGWIN__; ``` Just wondering: Is there a reason for this, or is it just some people's code styles? I would think that it makes it hard to read.