import type { Equal } from '../../mod.js';
/** ## OrdResult : 两个数据的比较结果
@case LT = -1 小于
@case EQ =  0 等于
@case GT =  1 大于
@category Interface
 */
export declare enum OrdResult {
    LT = -1,
    EQ = 0,
    GT = 1
}
/** ## `Ord` : 提供比较的功能
@example
```ts
class A implements Ord<number> {
  constructor(public a?: number) {}

  equals(val: number): boolean {
    return this.a === val
  }
  compare(val: number): number {
    return this.a - val
  }
}
const Na = new A(1)
assert(Na.equals(1) === true)
assert(Na.equals(2) === false)
assert(Na.compare(2) === -1)
assert(Na.compare(1) === 0)
assert(Na.compare(0) === 1)
```
@category Interface

 */
export interface Ord<T> extends Equal<T> {
    compare(val: T): OrdResult;
}
/** ## `OrdSelf` : `Ord`的特化版本,表示和自身比较的能力
+ 君子协议,ts不能进行规范 */
export interface OrdSelf<T> extends Ord<T> {
}
/** ## `implements_ord` : 判断是否实现了`Ord`接口 */
export declare function implements_ord(value: unknown): value is Ord<unknown>;
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