将一系列范围传递给可变参数函数
Phobos 文档显示了传递给可变参数函数的范围的以下示例
int[] a = [ 1, 2, 4, 5, 7, 9 ];
int[] b = [ 0, 1, 2, 4, 7, 8 ];
int[] c = [ 0, 1, 4, 5, 7, 8 ];
assert(equal(setIntersection(a, a), a));
assert(equal(setIntersection(a, b), [1, 2, 4, 7][]));
assert(equal(setIntersection(a, b, c), [1, 4, 7][]));
但是，如果您有一个范围范围，并且您事先不知道它将包含多少个元素，就像
int[][] a = [[1,2,3,4],[1,2,4,5],[1,3,4,5]];
我唯一能想到的是
if (a.length > 1) {
auto res = array(setIntersection(a[0], a[1]));
for (int i = 2; i < a.length; i++)
res = array(setIntersection(res, a[i]));
writeln(res);
}
哪个有效。但我希望能够将参数直接传递给函数，例如 setIntersection(a.tupleof) 或类似的东西（我知道 tupleof 在这里不起作用）。
The Phobos documentation shows the following example of ranges passed to a variadic function
int[] a = [ 1, 2, 4, 5, 7, 9 ];
int[] b = [ 0, 1, 2, 4, 7, 8 ];
int[] c = [ 0, 1, 4, 5, 7, 8 ];
assert(equal(setIntersection(a, a), a));
assert(equal(setIntersection(a, b), [1, 2, 4, 7][]));
assert(equal(setIntersection(a, b, c), [1, 4, 7][]));
But what if you have a range of ranges, and you don't know in advance how many elements it will contain, like
int[][] a = [[1,2,3,4],[1,2,4,5],[1,3,4,5]];
The only thing I can think of is
if (a.length > 1) {
auto res = array(setIntersection(a[0], a[1]));
for (int i = 2; i < a.length; i++)
res = array(setIntersection(res, a[i]));
writeln(res);
}
Which works. But I was hoping to be able to pass the argument directly to the function, like setIntersection(a.tupleof) or something like that (I know that tupleof doesn't work here).
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如果您不知道
a将有多少个元素，您将无法在编译时将其扩展为元组（并因此将其传递到函数中），因此 for 循环是最好的选择下注（或实现您自己的
setIntersection，它可以采用一系列范围）if you don't know how many elements
awill have you won't be able to expand it into a tuple at compile time (and consequently pass it into a function)so that for loop is your best bet (or implement your own
setIntersectionthat can take a range of ranges)