如何在C ++中创建大小为1位的元素数组

Question

In c / c++, we can define a variable with 1 bit in memory: like unsigned char value : 1 ;

Is there a way to declare an array of 1 bit elements? like in sudo code below:

unsigned char : 1 data[10];

Answer 1

The problem is that in most implementations, the 1 bit variable will still occupy 1 byte of memory because that's the way the memory is addressed. If you have a big array of such values, however, then you can work around that. One such solution is std::bitset . You can make one like this:

#include <bitset>
std::bitset<64> data;

You can manipulate bits using the set , reset and flip operations (setting it to 1, 0 or toggling it). You can access a bit using [] , for instance

if (data[5]) { ...

Check out a nice example here .