On Monday, 20 August 2018 at 13:14:14 UTC, Andrey wrote:
Hello,
I want to make an alias to function "std.stdio.writeln" and "std.stdio.write" and use it like:

static void log(bool newline = true)(string text)
{
   alias print(T...) = newline ? &writeln : &write;

   _file.print();
   text.print();
}

Unfortunately, it doesn't work... Also tried with "enum print ..." but also no success.
How to do it correctly?

Since newline is a compile-time parameter, you can use `static if`:

static if (newline) {
    alias print = writeln;
} else {
    alias print = write;
}

Note that since this alias is local to the function, you cannot use it with UFCS, so you will have to write `print(text)` instead of `text.print()`.

Full example: https://run.dlang.io/is/SrBJdk

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