Re: opBinary : Static ifs or specialization?

[Meta via Digitalmars-d-learn]

On Tuesday, 23 June 2020 at 23:53:36 UTC, claptrap wrote:

So you have opBinary and half a dozen operators to implement. Do you use a separate method for each operator or do you have one method and a big static if else if to select code path?

I assume they are functionally equivalent? So its just about style?

An idiomatic example:

import std.algorithm: among;

struct Test
{
    int payload;

    Test opBinary(string op)(Test other)
    if (op.among!("+", "-", "*", "/")) //Limit supported ops
    {
        mixin("return Test(payload " ~ op ~ "other.val);");
    }

    int opBinary(string op)(int n)
    //No constraint; support the full range of integer operations
    {
        mixin("return payload " ~ op ~ "n;");
    }
}