Macro kernel::count_brace_items

source · [−]

macro_rules! count_brace_items {
    ({$($item:tt)*}, $($remaining:tt)*) => { ... };
    ({$($item:tt)*}) => { ... };
    () => { ... };
}

Expand description

Counts the number of comma-separated entries surrounded by braces.

Examples


assert_eq!(0, count_brace_items!());
assert_eq!(1, count_brace_items!({ A }));
assert_eq!(1, count_brace_items!({ A },));
assert_eq!(2, count_brace_items!({ A }, { B }));
assert_eq!(2, count_brace_items!({ A }, { B },));
assert_eq!(3, count_brace_items!({ A }, { B }, { C }));
assert_eq!(3, count_brace_items!({ A }, { B }, { C },));