static foreach and new identifier names

[biozic]

On Friday, 5 January 2018 at 22:25:22 UTC, Adam D. Ruppe wrote:
>
> The idea is to take a list of inputs - functions with the 
> @magic annotation - and create wrapper functions for them with 
> the same name, just without the tailing _.
>
> (for one example)

Does this do what you want? (without UDA @magic)

import std.conv;
import std.meta;
import std.stdio;
import std.traits;

enum nameWithout_(alias a) = __traits(identifier, a)[0 .. $ - 1];

struct FunWrap {
     static auto caller(alias func)(Parameters!func args) {
         args[0]++;
         return func(args);
     }
}

static foreach (func; AliasSeq!(foo_, bar_)) {
     mixin("alias " ~ nameWithout_!func ~ " = 
FunWrap.caller!func;");
}

private string foo_(int i) {
     return "foo says " ~ i.to!string;
}

private string bar_(int i) {
     return "bar says " ~ i.to!string;
}

void main() {
     writeln(foo(42));  // "foo says 43"
     writeln(bar(0));  // "bar says 1"
}