19 General utilities library [utilities]

19.9 Bitsets [bitset]

19.9.2 Class template bitset [template.bitset]

19.9.2.1 bitset constructors [bitset.cons]

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constexpr bitset() noexcept;
1
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Effects: Constructs an object of class bitset<N>, initializing all bits to zero.
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constexpr bitset(unsigned long long val) noexcept;
2
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Effects: Constructs an object of class bitset<N>, initializing the first M bit positions to the corresponding bit values in val.
M is the smaller of N and the number of bits in the value representation of unsigned long long.
If M < N, the remaining bit positions are initialized to zero.
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template<class charT, class traits, class Allocator> 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'));
3
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Throws: out_­of_­range if pos > str.size() or invalid_­argument if an invalid character is found (see below).
4
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Effects: Determines the effective length rlen of the initializing string as the smaller of n and str.size() - pos.
The function then throws invalid_­argument if any of the rlen characters in str beginning at position pos is other than zero or one.
The function uses traits​::​eq() to compare the character values.
Otherwise, the function constructs an object of class bitset<N>, initializing the first M bit positions to values determined from the corresponding characters in the string str.
M is the smaller of N and rlen.
5
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An element of the constructed object has value zero if the corresponding character in str, beginning at position pos, is zero.
Otherwise, the element has the value one.
Character position pos + M - 1 corresponds to bit position zero.
Subsequent decreasing character positions correspond to increasing bit positions.
6
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If M < N, remaining bit positions are initialized to zero.
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template<class charT> explicit bitset( const charT* str, typename basic_string<charT>::size_type n = basic_string<charT>::npos, charT zero = charT('0'), charT one = charT('1'));
7
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Effects: Constructs an object of class bitset<N> as if by: 
bitset(n == basic_string<charT>::npos
          ? basic_string<charT>(str)
          : basic_string<charT>(str, n),
       0, n, zero, one)