20 General utilities library [utilities]

20.9 Bitsets [bitset]

20.9.2 Class template bitset [template.bitset]

20.9.2.3 Members [bitset.members]

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bitset<N>& operator&=(const bitset<N>& rhs) noexcept;
1
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Effects: Clears each bit in *this for which the corresponding bit in rhs is clear, and leaves all other bits unchanged.
2
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Returns: *this.
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bitset<N>& operator|=(const bitset<N>& rhs) noexcept;
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Effects: Sets each bit in *this for which the corresponding bit in rhs is set, and leaves all other bits unchanged.
4
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Returns: *this.
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bitset<N>& operator^=(const bitset<N>& rhs) noexcept;
5
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Effects: Toggles each bit in *this for which the corresponding bit in rhs is set, and leaves all other bits unchanged.
6
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Returns: *this.
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bitset<N>& operator<<=(size_t pos) noexcept;
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Effects: Replaces each bit at position I in *this with a value determined as follows:
  • (7.1)
    If I < pos, the new value is zero;
  • (7.2)
    If I >= pos, the new value is the previous value of the bit at position I - pos.
8
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Returns: *this.
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bitset<N>& operator>>=(size_t pos) noexcept;
9
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Effects: Replaces each bit at position I in *this with a value determined as follows:
  • (9.1)
    If pos >= N - I, the new value is zero;
  • (9.2)
    If pos < N - I, the new value is the previous value of the bit at position I + pos.
10
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Returns: *this.
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bitset<N>& set() noexcept;
11
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Effects: Sets all bits in *this.
12
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Returns: *this.
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bitset<N>& set(size_t pos, bool val = true);
13
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Effects: Stores a new value in the bit at position pos in *this.
If val is true, the stored value is one, otherwise it is zero.
14
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Returns: *this.
15
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Throws: out_­of_­range if pos does not correspond to a valid bit position.
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bitset<N>& reset() noexcept;
16
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Effects: Resets all bits in *this.
17
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Returns: *this.
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bitset<N>& reset(size_t pos);
18
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Effects: Resets the bit at position pos in *this.
19
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Returns: *this.
20
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Throws: out_­of_­range if pos does not correspond to a valid bit position.
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bitset<N> operator~() const noexcept;
21
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Effects: Constructs an object x of class bitset<N> and initializes it with *this.
22
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Returns: x.flip().
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bitset<N>& flip() noexcept;
23
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Effects: Toggles all bits in *this.
24
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Returns: *this.
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bitset<N>& flip(size_t pos);
25
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Effects: Toggles the bit at position pos in *this.
26
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Returns: *this.
27
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Throws: out_­of_­range if pos does not correspond to a valid bit position.
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unsigned long to_ulong() const;
28
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Returns: x.
29
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Throws: overflow_­error if the integral value x corresponding to the bits in *this cannot be represented as type unsigned long.
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unsigned long long to_ullong() const;
30
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Returns: x.
31
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Throws: overflow_­error if the integral value x corresponding to the bits in *this cannot be represented as type unsigned long long.
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template<class charT = char, class traits = char_traits<charT>, class Allocator = allocator<charT>> basic_string<charT, traits, Allocator> to_string(charT zero = charT('0'), charT one = charT('1')) const;
32
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Effects: Constructs a string object of the appropriate type and initializes it to a string of length N characters.
Each character is determined by the value of its corresponding bit position in *this.
Character position N - 1 corresponds to bit position zero.
Subsequent decreasing character positions correspond to increasing bit positions.
Bit value zero becomes the character zero, bit value one becomes the character one.
33
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Returns: The created object.
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size_t count() const noexcept;
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Returns: A count of the number of bits set in *this.
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constexpr size_t size() const noexcept;
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Returns: N.
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bool operator==(const bitset<N>& rhs) const noexcept;
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Returns: true if the value of each bit in *this equals the value of the corresponding bit in rhs.
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bool test(size_t pos) const;
37
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Returns: true if the bit at position pos in *this has the value one.
38
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Throws: out_­of_­range if pos does not correspond to a valid bit position.
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bool all() const noexcept;
39
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Returns: count() == size().
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bool any() const noexcept;
40
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Returns: count() != 0.
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bool none() const noexcept;
41
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Returns: count() == 0.
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bitset<N> operator<<(size_t pos) const noexcept;
42
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Returns: bitset<N>(*this) <<= pos.
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bitset<N> operator>>(size_t pos) const noexcept;
43
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Returns: bitset<N>(*this) >>= pos.
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constexpr bool operator[](size_t pos) const;
44
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Preconditions: pos is valid.
45
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Returns: true if the bit at position pos in *this has the value one, otherwise false.
46
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Throws: Nothing.
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bitset<N>::reference operator[](size_t pos);
47
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Preconditions: pos is valid.
48
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Returns: An object of type bitset<N>​::​reference such that (*this)[pos] == this->test(pos), and such that (*this)[pos] = val is equivalent to this->set(pos, val).
49
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Throws: Nothing.
50
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Remarks: For the purpose of determining the presence of a data race, any access or update through the resulting reference potentially accesses or modifies, respectively, the entire underlying bitset.