IntFittingRange

Returns the smallest integer type that can hold both from and to.

Source

Implementation

pub fn IntFittingRange(comptime from: comptime_int, comptime to: comptime_int) type {
    assert(from <= to);
    const signedness: std.builtin.Signedness = if (from < 0) .signed else .unsigned;
    return @Type(.{ .int = .{
        .signedness = signedness,
        .bits = @as(u16, @intFromBool(signedness == .signed)) +
            switch (if (from < 0) @max(@abs(from) - 1, to) else to) {
                0 => 0,
                else => |pos_max| 1 + log2(pos_max),
            },
    } });
}