EntityId

Description#

tmux spells these $0, @1 and %2. The prefix says which kind it is, and nothing in the type did: six accessors returned std::string_view, so a window id compiled wherever a pane id belonged, and pane.id() == window.id() was a comparison that can never be true but always built.

The string is reached through value() rather than through a conversion. A conversion is what let the mix-up through in the first place: with one, every std::string_view parameter accepts any id again, and this would read as type safety while providing none.

Comparing an id to plain text still works, because that cannot confuse two kinds — pane.id() == "%0" asks something answerable. Comparing two ids of different kinds does not compile.