Re: string to character code hex string

[bitwise via Digitalmars-d-learn]

On Saturday, 2 September 2017 at 17:45:30 UTC, Moritz Maxeiner 
wrote:

If this (unnecessary waste) is of concern to you (and from the 
fact that you used ret.reserve I assume it is), then the easy 
fix is to use `sformat` instead of `format`:


Yes, thanks. I'm going to go with a variation of your approach:

private
string toAsciiHex(string str)
{
    import std.ascii : lowerHexDigits;
    import std.exception: assumeUnique;

    auto ret = new char[str.length * 2];
    int i = 0;

    foreach(c; str) {
        ret[i++] = lowerHexDigits[(c >> 4) & 0xF];
        ret[i++] = lowerHexDigits[c & 0xF];
    }

    return ret.assumeUnique;
}

I'm not sure how the compiler would mangle UTF8, but I intend to 
use this on one specific function (actually the 100's of 
instantiations of it). It will predictably named though.

   Thanks!