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Function std.range.primitives.empty

Implements the range interface primitive empty for types that obey hasLength property and for narrow strings. Due to the fact that nonmember functions can be called with the first argument using the dot notation, a.empty is equivalent to empty(a).

bool empty(T) (
  auto scope ref const(T) a
) @property
if (is(typeof(a.length) : size_t) || isNarrowString!T);

Example

auto a = [ 1, 2, 3 ];
assert(!a.empty);
assert(a[3 .. $].empty);

int[string] b;
assert(b.empty);
b["zero"] = 0;
assert(!b.empty);

Authors

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

License

Boost License 1.0.

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