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  1. import std.stdio, std.typecons;
  2.  
  3. int[] foo(T...)(T args)
  4. {
  5.     writeln("Called foo ...");
  6.     foreach (i, arg; args)
  7.         writefln("    args[%d] == %s", i, arg);
  8.     writeln("... foo end");
  9.  
  10.     return [ 5, 10, 15, 20 ];
  11. }
  12.  
  13. auto unpack(alias fun, V...)(ref Tuple!V t)
  14. {
  15.     auto f(size_t i, U...)(U args)
  16.     {
  17.         static if (i == 0)
  18.             return fun(args);
  19.         else
  20.             return f!(i - 1)(t.field[i - 1], args);
  21.     }
  22.     return f!(V.length)();
  23. }
  24.  
  25. void main()
  26. {
  27.     auto tup = tuple(
  28.         5, 3.14f, "hello world", [ 5, 10, 15 ], [ "foo":5, "bar":10 ]
  29.     );
  30.  
  31.     auto ret = unpack!foo(tup);
  32.     writeln("retval from foo: ", ret);
  33. }
  34.  
Success #stdin #stdout 0.02s 2152KB
comments (?)
stdin 
Standard input is empty
stdout 
Called foo ...
    args[0] == 5
    args[1] == 3.14
    args[2] == hello world
    args[3] == 5 10 15
    args[4] == [bar:10,foo:5]
... foo end
retval from foo: 5 10 15 20
https://ideone.com/pkGFj
language:
D (dmd 2.085.0)
created:
14 years ago
visibility:
public

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