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Function `std.range.takeExactly`

Similar to take, but assumes that range has at least n elements. Consequently, the result of takeExactly(range, n) always defines the length property (and initializes it to n) even when range itself does not define length.


						
				auto takeExactly(R)
				(
				

				  R range,
				

				  size_t n
				

				)
				

				if (isInputRange!R);

The result of takeExactly is identical to that of take in cases where the original range defines length or is infinite.

Unlike take, however, it is illegal to pass a range with less than n elements to takeExactly; this will cause an assertion failure.

Example

import std.algorithm.comparison : equal;

auto a = [ 1, 2, 3, 4, 5 ];

auto b = takeExactly(a, 3);
assert(equal(b, [1, 2, 3]));
static assert(is(typeof(b.length) == size_t));
writeln(b.length); // 3
writeln(b.front); // 1
writeln(b.back); // 3

Authors

Andrei Alexandrescu, David Simcha, Jonathan M Davis, and Jack Stouffer. Credit for some of the ideas in building this module goes to Leonardo Maffi.

License

Boost License 1.0.