如何存储向量<bool>或一个位集到文件中，但按位? [英] How does one store a vector<bool> or a bitset into a file, but bit-wise?

问题描述

如何将位集数据写入文件?

第一个答案没有正确回答问题，因为它占用的空间比应有的多 8 倍.

The first answer doesn't answer the question correctly, since it takes 8 times more space than it should.

你会怎么做?我真的需要它来保存很多真/假值.

How would you do it ? I really need it to save a lot of true/false values.

推荐答案

最简单的方法:取连续的 8 个布尔值，将它们表示为单个字节，将该字节写入您的文件.那会节省很多空间.

Simplest approach : take consecutive 8 boolean values, represent them as a single byte, write that byte to your file. That would save lot of space.

在文件的开头，您可以写入要写入文件的boolean值的数量；该数字将有助于从文件中读取字节并将它们转换回布尔值！

In the beginning of file, you can write the number of boolean values you want to write to the file; that number will help while reading the bytes from file, and converting them back into boolean values!

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