Re: String joining an array of structs or class instances implementing toString?

[Ali Çehreli via Digitalmars-d-learn]

On 02/11/2016 04:44 AM, pineapple wrote:
It feels like there should be an out-of-the box way to do this but I
haven't been able to find it? Help?
This is the thing that I want to do:

struct example{
     const string str;
     //this(string str){ this.str = str; }
     string toString(){
         return this.str;
     }
}

public void main(){
     import std.stdio;
     import std.string;
     example[] parts = [example("hello"), example("world")];
     writeln(std.string.join(parts, " "));
}


You can use element format specifiers:

    writeln(format("%(%s %)", parts));

writefln understands that too:

    writefln("%(%s %)", parts);

Ali

[1] http://dlang.org/phobos/std_format.html#.formattedWrite
[2] 
http://ddili.org/ders/d.en/formatted_output.html#ix_formatted_output.%%28