Ruby最大整数 [英] Ruby max integer

问题描述

我需要能够确定Ruby中系统的最大整数.有人知道如何，或者是否有可能?

I need to be able to determine a systems maximum integer in Ruby. Anybody know how, or if it's possible?

推荐答案

Ruby在溢出时会自动将整数转换为大整数类，因此(实际上)对它们的大小没有限制.

Ruby automatically converts integers to a large integer class when they overflow, so there's (practically) no limit to how big they can be.

如果您正在寻找计算机的大小，即64位或32位，我发现此ruby-forum.com上的把戏:

If you are looking for the machine's size, i.e. 64- or 32-bit, I found this trick at ruby-forum.com:

machine_bytes = ['foo'].pack('p').size
machine_bits = machine_bytes * 8
machine_max_signed = 2**(machine_bits-1) - 1
machine_max_unsigned = 2**machine_bits - 1

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如果要查找Fixnum对象的大小(小到足以存储在单个机器字中的整数)，则可以调用0.size以获取字节数.我猜它在32位版本上应该是4，但是我现在无法测试.同样，最大的Fixnum显然是2**30 - 1(或2**62 - 1)，因为使用一位将其标记为整数而不是对象引用.

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If you are looking for the size of Fixnum objects (integers small enough to store in a single machine word), you can call 0.size to get the number of bytes. I would guess it should be 4 on 32-bit builds, but I can't test that right now. Also, the largest Fixnum is apparently 2**30 - 1 (or 2**62 - 1), because one bit is used to mark it as an integer instead of an object reference.

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