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+[bitset.cons]
+
+# 22 General utilities library [[utilities]](./#utilities)
+
+## 22.9 Bitsets [[bitset]](bitset#cons)
+
+### 22.9.2 Class template bitset [[template.bitset]](template.bitset#bitset.cons)
+
+#### 22.9.2.2 Constructors [bitset.cons]
+
+[ð](#lib:bitset,constructor)
+
+`constexpr bitset() noexcept;
+`
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L10533)
+
+*Effects*: Initializes all bits in *this to zero[.](#1.sentence-1)
+
+[ð](#lib:bitset,constructor_)
+
+`constexpr bitset(unsigned long long val) noexcept;
+`
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L10544)
+
+*Effects*: Initializes the first M bit positions to the corresponding bit
+values in val[.](#2.sentence-1)
+
+M is the smaller of N and the number of bits in the value
+representation ([[basic.types.general]](basic.types.general#term.object.representation "6.9.1 General")) of unsigned long long[.](#2.sentence-2)
+
+If M < N, the remaining bit positions are initialized to zero[.](#2.sentence-3)
+
+[ð](#lib:bitset,constructor__)
+
+`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'));
+`
+
+[3](#3)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L10574)
+
+*Effects*: Determines the effective lengthrlen of the initializing string as the smaller ofn andstr.size() - pos[.](#3.sentence-1)
+
+Initializes the first M bit
+positions to values determined from the corresponding characters in the stringstr[.](#3.sentence-2)
+
+M is the smaller of N and rlen[.](#3.sentence-3)
+
+[4](#4)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L10585)
+
+An element of the constructed object has value zero if the
+corresponding character in str, beginning at positionpos, iszero[.](#4.sentence-1)
+
+Otherwise, the element has the value one[.](#4.sentence-2)
+
+Character position pos + M - 1 corresponds to bit position zero[.](#4.sentence-3)
+
+Subsequent decreasing character positions correspond to increasing bit positions[.](#4.sentence-4)
+
+[5](#5)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L10594)
+
+If M < N, remaining bit positions are initialized to zero[.](#5.sentence-1)
+
+[6](#6)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L10597)
+
+The function uses traits::eq to compare the character values[.](#6.sentence-1)
+
+[7](#7)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L10601)
+
+*Throws*: out_of_range if pos > str.size() orinvalid_argument if any of
+the rlen characters in str beginning at position pos is other than zero or one[.](#7.sentence-1)
+
+[ð](#lib:bitset,constructor___)
+
+`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'));
+`
+
+[8](#8)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L10623)
+
+*Effects*: As if by:bitset(n == basic_string_view<charT>::npos ? basic_string_view<charT>(str): basic_string_view<charT>(str, n), 0, n, zero, one)