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Variable std.typecons.Tuple.expand

Use t.expand for a Tuple t to expand it into its components. The result of expand acts as if the Tuple's components were listed as a list of values. (Ordinarily, a Tuple acts as a single value.)

Declaration

struct Tuple
{
	// ...
	Tuple.Types expand;
	// ...
}

Example

auto t1 = tuple(1, " hello ", 2.3);
assert(t1.toString() == Tuple!(int, string, double)(1, " hello ", 2.3));

void takeSeveralTypes(int n, string s, bool b)
{
    assert(n == 4 && s == "test" && b == false);
}

auto t2 = tuple(4, "test", false);
//t.expand acting as a list of values
takeSeveralTypes(t2.expand);

Example

alias ISD = Tuple!(int, string, double);
auto tup = ISD(1, "test", 3.2);
assert(tup.toString() == Tuple!(int, string, double)(1, "test", 3.2));

Authors

Andrei Alexandrescu, Bartosz Milewski, Don Clugston, Shin Fujishiro, Kenji Hara

License

Boost License 1.0.

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