bitset用法总结

一般而言，标准库提供的bitset操作更直接、更容易阅读和书写、正确使用的可能性更高。而且，bitset对象的大小不受unsigned数的位数限制。通常来说，bitset优于整形数据的低级位操作。

 

bitset的几个操作和位运算之间的转化。

bitset<32> bs(88);

unsigned long l=88;

bs.set(6);

l |= 1UL<<6;

bs.reset(6);

l &= ~(1UL<<6)

 

构造函数可以传入一个string或者unsigned long。

简单介绍bitset的方法，copy msdn（在这里不做翻译了）。

any

The member function tests whether any bit in the sequence is set to 1.

count

The member function returns the number of bits set in the bit sequence.

flip

Toggles the value of all the bits in a bitset or toggles a single bit at a specified position.

这个函数的作用就是将所有的bit求反或者将指定位的bit求反，注意位都是从右边0开始的。

none

Tests if no bit has been set to 1 in a bitset object.

reset

Resets all the bits in a bitset to 0 or resets a bit at a specified position to 0.

set

Sets all the bits in a bitset to 1 or sets a bit at a specified position to 1.

size

Returns the number of bits in a bitset object.

test

Tests whether the bit at a specified position in a bitset is set to 1.

to_string

Converts a bitset object to a string representation.

to_ulong

Converts a bitset object to the integer that would generate the sequence of bits contained if used to initialize the bitset.