从联合类型推断泛型类的方法参数

let value: string | number;

public class Box<T> {
    private T t;

    public void set(T t) {
        this.t = t;
    }

    public T get() {
        return t;
    }
}

class Processor<T> {
    process(input: T): void {
        if (typeof input === 'string') {
            console.log(`Processing string: ${input.toUpperCase()}`);
        } else if (typeof input === 'number') {
            console.log(`Processing number: ${input * 2}`);
        } else {
            throw new Error('Unsupported type');
        }
    }
}

// 使用示例
const stringProcessor = new Processor<string>();
stringProcessor.process('hello'); // 输出: Processing string: HELLO

const numberProcessor = new Processor<number>();
numberProcessor.process(5); // 输出: Processing number: 10