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Function `std.algorithm.comparison.isSameLength`

Checks if two or more ranges have the same number of elements. This function is optimized to always take advantage of the length member of either range if it exists.


						
				bool isSameLength(Ranges...)
				(
				

				  Ranges rs
				

				)
				

				if (allSatisfy!(isInputRange, Ranges));

If all ranges have a length member or at least one is infinite, _isSameLength's complexity is Ο(1). Otherwise, complexity is Ο(n), where n is the smallest of the lengths of ranges with unknown length.

Infinite ranges are considered of the same length. An infinite range has never the same length as a finite range.

Parameters

Name	Description
rs	two or more input ranges

Returns

true if both ranges have the same length, false otherwise.

Example

assert(isSameLength([1, 2, 3], [4, 5, 6]));
assert(isSameLength([1, 2, 3], [4, 5, 6], [7, 8, 9]));
assert(isSameLength([0.3, 90.4, 23.7, 119.2], [42.6, 23.6, 95.5, 6.3]));
assert(isSameLength("abc", "xyz"));
assert(isSameLength("abc", "xyz", [1, 2, 3]));

int[] a;
int[] b;
assert(isSameLength(a, b));
assert(isSameLength(a, b, a, a, b, b, b));

assert(!isSameLength([1, 2, 3], [4, 5]));
assert(!isSameLength([1, 2, 3], [4, 5, 6], [7, 8]));
assert(!isSameLength([0.3, 90.4, 23.7], [42.6, 23.6, 95.5, 6.3]));
assert(!isSameLength("abcd", "xyz"));
assert(!isSameLength("abcd", "xyz", "123"));
assert(!isSameLength("abcd", "xyz", "1234"));

Authors

Andrei Alexandrescu

License

Boost License 1.0.