Checking, whether string contains only ascii.

[jklm via Digitalmars-d-learn]

On Wednesday, 22 February 2017 at 19:26:15 UTC, berni wrote:
> In my program, I read a postscript file. Normal postscript 
> files should only be composed of ascii characters, but one 
> never knows what users give us. Therefore I'd like to make sure 
> that the string the program read is only made up of ascii 
> characters. This simplifies the code thereafter, because I then 
> can assume, that codeunit==codepoint. Is there a simple way to 
> do so?
>
> Here a sketch of my function:
>
>>void foo(string postscript)
>>{
>>    // throw Exception, if postscript is not all ascii
>>    // other stuff, assuming codeunit=codepoint
>>}


void foo(string postscript)
{
     import std.ascii, astd.algorithm.ieration;
     if (!args[0].filter!(a => !isASCII(a)).empty)
         throw new Exception("bla");
}