Nathan Ward 19db1e402b [ecs] implement is_empty for queries (#2271) ... ## Problem - The `Query` struct does not provide an easy way to check if it is empty. - Specifically, users have to use `.iter().peekable()` or `.iter().next().is_none()` which is not very ergonomic. - Fixes: #2270 ## Solution - Implement an `is_empty` function for queries to more easily check if the query is empty.		2021-06-02 20:50:06 +00:00
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macros	Add new SystemState and rename old SystemState to SystemMeta (#2283)	2021-06-02 19:57:38 +00:00
src	[ecs] implement is_empty for queries (#2271)	2021-06-02 20:50:06 +00:00
Cargo.toml	Release 0.5.0 (#1835)	2021-04-06 18:48:48 +00:00