export declare abstract class Comparison {
    abstract to_number(): number;
    abstract if_equals(f: () => Comparison): Comparison;
    static get less(): LessThan;
    static get equals(): Equals;
    static get greater(): GreaterThan;
}
declare class LessThan extends Comparison {
    to_number(): number;
    if_equals(f: () => Comparison): this;
}
declare class Equals extends Comparison {
    to_number(): number;
    if_equals(f: () => Comparison): Comparison;
}
declare class GreaterThan extends Comparison {
    to_number(): number;
    if_equals(f: () => Comparison): this;
}
export {};