bitwise operator variations in C++

Question

I read C++ provides additional operators to the usual &,|, and ! which are "and","or" and "not" respectively, plus they come with automatic short circuiting properties where applicable.

I would like to use these operators in my code but the compiler interprets them as identifiers and throws an error.

I am using Visual C++ 2008 Express Edition with SP1. How do I activate these operators to use in my code?

Answer 1

如果要在MSVC ++中提供运算符的' and '，' or '，' xor '等关键字版本，则必须使用' /Za '选项禁用扩展名，或者必须包含iso646.h 。

Answer 2

The traditional C++ spelling [*] (just like in C) is && for "logical", short-circuit and , || for "logical", short-circuit or . ! is "logical" not (of course it doesn't short-circuit: what ever would that mean ?!-). The bitwise versions are & , | , ~ .

According to the C++ standard, the spellings you like ( and , or , and so on) should also be implemented, but apparently popular compilers disobey that rule. However you should be able to #include <ciso646> or #include <iso646.h> to hack around that via macros -- see this page , and if your favorite compiler is missing these header files, just create them the obvious way, ie,

#define and &&
#define or ||

and so on. (Kudos and gratitude to the commenters for making me research the issue better and find this out!)