Re: logical operands on strings

[Meta]

On Sunday, 12 January 2014 at 18:21:06 UTC, Erik van Velzen wrote:
I would like to do this:
    string one = x"315c4eeaa8b5f8aaf9174145bf43e1784b";
    string two = x"c29398f5f3251a0d47e503c66e935de81230b59b7a";
    string three = one ^ two;


The closests I've been able to get is:

    string three = xor(one, two);

    string xor(string one, string two) {
        int len = min(one.length, two.length);
        string result;
        for(int i=0; i<len; i++) {
            result ~= one[i] ^ two[i];
        }
        return cast(string)result;
    }

Question 1: is there a more elegant way to implement the 
function xor? (foreach-ish or std.algorithm)


Then I tried to add operator overloading:

    string opBinary(string op)(string lhs, string rhs) {
        static if( op == "^" )
            return xor(lhs, rhs);
        else static assert(false, "operator not possible");
    }

But it doesn't invoke this function.

Question 2: how would I implement "^" for strings?

It looks like your opBinary on strings is an attempt at globally 
overriding the XOR operator. I'm almost 100% sure this won't work 
in D. All operator overloads have to be part of a class or struct.