Function activeTag [src]

Returns the active tag of a tagged union

Prototype

pub fn activeTag(u: anytype) Tag(@TypeOf(u))

Example

 test activeTag {
    const UE = enum {
        Int,
        Float,
    };

    const U = union(UE) {
        Int: u32,
        Float: f32,
    };

    var u = U{ .Int = 32 };
    try testing.expect(activeTag(u) == UE.Int);

    u = U{ .Float = 112.9876 };
    try testing.expect(activeTag(u) == UE.Float);
}

Source

  pub fn activeTag(u: anytype) Tag(@TypeOf(u)) {
    const T = @TypeOf(u);
    return @as(Tag(T), u);
}  