Inserting Unicode Hyphen-minus into a string causes an error

Question

I am trying to insert a hyphen minus unicode in a text string. I see an "Invalid universal character" error with the following:

u + 002D (hyphen minus)

[textViewContent insertString:@"\u002D" atIndex:cursorPosition.location]; 

However, they work fine:

u + 2212 (minus)

 [textViewContent insertString:@"\u2212" atIndex:cursorPosition.location]; 

u + 2010 (hyphen)

 [textViewContent insertString:@"\u2010" atIndex:cursorPosition.location]; 

I have already talked about several existing Unicode discussions, but have not found what explains what is different from my examples, which lead to the first error. Insight is much appreciated.

Answer 1

Unlimited character names have some restrictions on their use. In C99 and C ++ 98, you were not allowed to use the one that referenced the character in the base character set (which includes U + 002D).

C ++ 11 updated this requirement, so if you are inside a string or character literal, you are allowed to use a UCN that refers to the main characters. Depending on the version of the compiler you are using, I would suggest that you can use Objective-C ++ 11 to make your code legal.

However, since this character is part of ASCII and the basic character set, why don't you just write it literally?

 @"-"