Standard library header <bitset>

#include <string>
#include <iosfwd> // for istream, ostream
 
namespace std {
 template<size_t N> class bitset;
 
 // bitset operators
 template<size_t N>
 constexpr bitset<N> operator&(const bitset<N>&, const bitset<N>&) noexcept;
 template<size_t N>
 constexpr bitset<N> operator|(const bitset<N>&, const bitset<N>&) noexcept;
 template<size_t N>
 constexpr bitset<N> operator^(const bitset<N>&, const bitset<N>&) noexcept;
 template<class CharT, class Traits, size_t N>
 basic_istream<CharT, Traits>&
 operator>>(basic_istream<CharT, Traits>& is, bitset<N>& x);
 template<class CharT, class Traits, size_t N>
 basic_ostream<CharT, Traits>&
 operator<<(basic_ostream<CharT, Traits>& os, const bitset<N>& x);
}

namespace std {
 template<size_t N> class bitset {
 public:
 // bit reference
 class reference {
 public:
 constexpr reference(const reference&) = default;
 constexpr ~reference();
 constexpr reference& operator=(bool x) noexcept; // for b[i] = x;
 constexpr reference& operator=(const reference&) noexcept; // for b[i] = b[j];
 constexpr bool operator~() const noexcept; // flips the bit
 constexpr operator bool() const noexcept; // for x = b[i];
 constexpr reference& flip() noexcept; // for b[i].flip();
 };
 
 // constructors
 constexpr bitset() noexcept;
 constexpr bitset(unsigned long long val) noexcept;
 template<class CharT, class Traits, class Allocator>
 constexpr explicit bitset(
 const basic_string<CharT, Traits, Allocator>& str,
 typename basic_string<CharT, Traits, Allocator>::size_type pos = 0,
 typename basic_string<CharT, Traits, Allocator>::size_type n
 = basic_string<CharT, Traits, Allocator>::npos,
 CharT zero = CharT('0'),
 CharT one = CharT('1'));
 template<class CharT, class Traits>
 constexpr explicit bitset(
 basic_string_view<CharT, Traits> str,
 typename basic_string_view<CharT, Traits>::size_type pos = 0,
 typename basic_string_view<CharT, Traits>::size_type n
 = basic_string_view<CharT, Traits>::npos,
 CharT zero = CharT('0'),
 CharT one = CharT('1'));
 template<class CharT>
 constexpr explicit bitset(
 const CharT* str,
 typename basic_string_view<CharT>::size_type n = basic_string_view<CharT>::npos,
 CharT zero = CharT('0'),
 CharT one = CharT('1'));
 
 // bitset operations
 constexpr bitset& operator&=(const bitset& rhs) noexcept;
 constexpr bitset& operator|=(const bitset& rhs) noexcept;
 constexpr bitset& operator^=(const bitset& rhs) noexcept;
 constexpr bitset& operator<<=(size_t pos) noexcept;
 constexpr bitset& operator>>=(size_t pos) noexcept;
 constexpr bitset operator<<(size_t pos) const noexcept;
 constexpr bitset operator>>(size_t pos) const noexcept;
 constexpr bitset& set() noexcept;
 constexpr bitset& set(size_t pos, bool val = true);
 constexpr bitset& reset() noexcept;
 constexpr bitset& reset(size_t pos);
 constexpr bitset operator~() const noexcept;
 constexpr bitset& flip() noexcept;
 constexpr bitset& flip(size_t pos);
 
 // element access
 constexpr bool operator[](size_t pos) const;
 constexpr reference operator[](size_t pos);
 
 constexpr unsigned long to_ulong() const;
 constexpr unsigned long long to_ullong() const;
 template<class CharT = char,
 class Traits = char_traits<CharT>,
 class Allocator = allocator<CharT>>
 constexpr basic_string<CharT, Traits, Allocator>
 to_string(CharT zero = CharT('0'), CharT one = CharT('1')) const;
 
 // observers
 constexpr size_t count() const noexcept;
 constexpr size_t size() const noexcept;
 constexpr bool operator==(const bitset& rhs) const noexcept;
 constexpr bool test(size_t pos) const;
 constexpr bool all() const noexcept;
 constexpr bool any() const noexcept;
 constexpr bool none() const noexcept;
 };
 
 // hash support
 template<class T> struct hash;
 template<size_t N> struct hash<bitset<N>>;
}