Convert call to a string

[ag0aep6g via Digitalmars-d-learn]

On Wednesday, 15 February 2017 at 22:34:22 UTC, H. S. Teoh wrote:
> 	auto debugPrint(alias fun, A...)(A args) {
> 		writefln("%s(%(%s, %))", __traits(identifier, fun), [args]);
> 		return fun(args);
> 	}
>
> 	string arg = "hello";
> 	string myCall = debugPrint!someFunction(1, arg);

`[args]` doesn't work when the tuple elements don't have a common 
type. But you can pass `args` as is to writefln and generate the 
format string accordingly:

----
import std.range: repeat;
import std.string: join;

immutable string argsfmt = "%s".repeat(args.length).join(", ");
writefln("%s(" ~  argsfmt ~ ")", __traits(identifier, fun), args);
----