C++ Primer, Fifth Edition

17.2.1. Defining and Initializing bitsets

Table 17.2 (overleaf) lists the constructors for bitset. The bitset class is a class template that, like the array class, has a fixed size (§ 9.2.4, p. 336). When we define a bitset, we say how many bits the bitset will contain:

bitset<32> bitvec(1U); // 32 bits; low-order bit is 1, remaining bits are 0

Table 17.2. Ways to Initialize a bitset

The size must be a constant expression (§ 2.4.4, p. 65). This statement defines bitvec as a bitset that holds 32 bits. Just as with the elements of a vector, the bits in a bitset are not named. Instead, we refer to them positionally. The bits are numbered starting ...