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[char.traits.specializations.char]
# 27 Strings library [[strings]](./#strings)
## 27.2 Character traits [[char.traits]](char.traits#specializations.char)
### 27.2.4 char_traits specializations [[char.traits.specializations]](char.traits.specializations#char)
#### 27.2.4.2 struct char_traits<char> [char.traits.specializations.char]
[🔗](#lib:char_traits)
namespace std {template<> struct char_traits<char> {using char_type = char; using int_type = int; using off_type = streamoff; using pos_type = streampos; using state_type = mbstate_t; using comparison_category = strong_ordering; static constexpr void assign(char_type& c1, const char_type& c2) noexcept; static constexpr bool eq(char_type c1, char_type c2) noexcept; static constexpr bool lt(char_type c1, char_type c2) noexcept; static constexpr int compare(const char_type* s1, const char_type* s2, size_t n); static constexpr size_t length(const char_type* s); static constexpr const char_type* find(const char_type* s, size_t n, const char_type& a); static constexpr char_type* move(char_type* s1, const char_type* s2, size_t n); static constexpr char_type* copy(char_type* s1, const char_type* s2, size_t n); static constexpr char_type* assign(char_type* s, size_t n, char_type a); static constexpr int_type not_eof(int_type c) noexcept; static constexpr char_type to_char_type(int_type c) noexcept; static constexpr int_type to_int_type(char_type c) noexcept; static constexpr bool eq_int_type(int_type c1, int_type c2) noexcept; static constexpr int_type eof() noexcept; };}
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/strings.tex#L308)
The type mbstate_t is defined in [<cwchar>](cwchar.syn#header:%3ccwchar%3e "28.7.3Header <cwchar> synopsis[cwchar.syn]") and can represent any of the conversion states that can occur in animplementation-defined set of supported multibyte
character encoding rules[.](#1.sentence-1)
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/strings.tex#L314)
The two-argument member assign is defined identically to the
built-in operator =[.](#2.sentence-1)
The two-argument members eq and lt are defined identically to the built-in operators== and < for type unsigned char[.](#2.sentence-2)
[3](#3)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/strings.tex#L320)
The membereof() returnsEOF[.](#3.sentence-1)

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[char.traits.specializations.char16.t]
# 27 Strings library [[strings]](./#strings)
## 27.2 Character traits [[char.traits]](char.traits#specializations.char16.t)
### 27.2.4 char_traits specializations [[char.traits.specializations]](char.traits.specializations#char16.t)
#### 27.2.4.4 struct char_traits<char16_t> [char.traits.specializations.char16.t]
[🔗](#lib:char_traits)
namespace std {template<> struct char_traits<char16_t> {using char_type = char16_t; using int_type = uint_least16_t; using off_type = streamoff; using pos_type = u16streampos; using state_type = mbstate_t; using comparison_category = strong_ordering; static constexpr void assign(char_type& c1, const char_type& c2) noexcept; static constexpr bool eq(char_type c1, char_type c2) noexcept; static constexpr bool lt(char_type c1, char_type c2) noexcept; static constexpr int compare(const char_type* s1, const char_type* s2, size_t n); static constexpr size_t length(const char_type* s); static constexpr const char_type* find(const char_type* s, size_t n, const char_type& a); static constexpr char_type* move(char_type* s1, const char_type* s2, size_t n); static constexpr char_type* copy(char_type* s1, const char_type* s2, size_t n); static constexpr char_type* assign(char_type* s, size_t n, char_type a); static constexpr int_type not_eof(int_type c) noexcept; static constexpr char_type to_char_type(int_type c) noexcept; static constexpr int_type to_int_type(char_type c) noexcept; static constexpr bool eq_int_type(int_type c1, int_type c2) noexcept; static constexpr int_type eof() noexcept; };}
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/strings.tex#L405)
The two-argument members assign,eq, and lt are defined identically to
the built-in operators =, ==, and<, respectively[.](#1.sentence-1)
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/strings.tex#L411)
The member eof() returns animplementation-defined constant that cannot appear
as a valid UTF-16 code unit[.](#2.sentence-1)

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[char.traits.specializations.char32.t]
# 27 Strings library [[strings]](./#strings)
## 27.2 Character traits [[char.traits]](char.traits#specializations.char32.t)
### 27.2.4 char_traits specializations [[char.traits.specializations]](char.traits.specializations#char32.t)
#### 27.2.4.5 struct char_traits<char32_t> [char.traits.specializations.char32.t]
[🔗](#lib:char_traits)
namespace std {template<> struct char_traits<char32_t> {using char_type = char32_t; using int_type = uint_least32_t; using off_type = streamoff; using pos_type = u32streampos; using state_type = mbstate_t; using comparison_category = strong_ordering; static constexpr void assign(char_type& c1, const char_type& c2) noexcept; static constexpr bool eq(char_type c1, char_type c2) noexcept; static constexpr bool lt(char_type c1, char_type c2) noexcept; static constexpr int compare(const char_type* s1, const char_type* s2, size_t n); static constexpr size_t length(const char_type* s); static constexpr const char_type* find(const char_type* s, size_t n, const char_type& a); static constexpr char_type* move(char_type* s1, const char_type* s2, size_t n); static constexpr char_type* copy(char_type* s1, const char_type* s2, size_t n); static constexpr char_type* assign(char_type* s, size_t n, char_type a); static constexpr int_type not_eof(int_type c) noexcept; static constexpr char_type to_char_type(int_type c) noexcept; static constexpr int_type to_int_type(char_type c) noexcept; static constexpr bool eq_int_type(int_type c1, int_type c2) noexcept; static constexpr int_type eof() noexcept; };}
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/strings.tex#L451)
The two-argument members assign,eq, and lt are defined identically to
the built-in operators =, ==, and<, respectively[.](#1.sentence-1)
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/strings.tex#L457)
The member eof() returns animplementation-defined constant that cannot appear as a Unicode
code point[.](#2.sentence-1)

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[char.traits.specializations.char8.t]
# 27 Strings library [[strings]](./#strings)
## 27.2 Character traits [[char.traits]](char.traits#specializations.char8.t)
### 27.2.4 char_traits specializations [[char.traits.specializations]](char.traits.specializations#char8.t)
#### 27.2.4.3 struct char_traits<char8_t> [char.traits.specializations.char8.t]
[🔗](#lib:char_traits)
namespace std {template<> struct char_traits<char8_t> {using char_type = char8_t; using int_type = unsigned int; using off_type = streamoff; using pos_type = u8streampos; using state_type = mbstate_t; using comparison_category = strong_ordering; static constexpr void assign(char_type& c1, const char_type& c2) noexcept; static constexpr bool eq(char_type c1, char_type c2) noexcept; static constexpr bool lt(char_type c1, char_type c2) noexcept; static constexpr int compare(const char_type* s1, const char_type* s2, size_t n); static constexpr size_t length(const char_type* s); static constexpr const char_type* find(const char_type* s, size_t n, const char_type& a); static constexpr char_type* move(char_type* s1, const char_type* s2, size_t n); static constexpr char_type* copy(char_type* s1, const char_type* s2, size_t n); static constexpr char_type* assign(char_type* s, size_t n, char_type a); static constexpr int_type not_eof(int_type c) noexcept; static constexpr char_type to_char_type(int_type c) noexcept; static constexpr int_type to_int_type(char_type c) noexcept; static constexpr bool eq_int_type(int_type c1, int_type c2) noexcept; static constexpr int_type eof() noexcept; };}
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/strings.tex#L359)
The two-argument members assign, eq, and lt are defined identically to
the built-in operators =, ==, and < respectively[.](#1.sentence-1)
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/strings.tex#L364)
The member eof() returns animplementation-defined constant
that cannot appear as a valid UTF-8 code unit[.](#2.sentence-1)

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[char.traits.specializations.general]
# 27 Strings library [[strings]](./#strings)
## 27.2 Character traits [[char.traits]](char.traits#specializations.general)
### 27.2.4 char_traits specializations [[char.traits.specializations]](char.traits.specializations#general)
#### 27.2.4.1 General [char.traits.specializations.general]
[🔗](#lib:char_traits)
namespace std {template<> struct char_traits<char>; template<> struct char_traits<char8_t>; template<> struct char_traits<char16_t>; template<> struct char_traits<char32_t>; template<> struct char_traits<wchar_t>;}
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/strings.tex#L262)
The header [<string>](string.syn#header:%3cstring%3e "27.4.2Header <string> synopsis[string.syn]") defines five specializations of the class templatechar_traits:char_traits<char>,char_traits<char8_t>,char_traits<char16_t>,char_traits<char32_t>,
andchar_traits<wchar_t>[.](#1.sentence-1)

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[char.traits.specializations.wchar.t]
# 27 Strings library [[strings]](./#strings)
## 27.2 Character traits [[char.traits]](char.traits#specializations.wchar.t)
### 27.2.4 char_traits specializations [[char.traits.specializations]](char.traits.specializations#wchar.t)
#### 27.2.4.6 struct char_traits<wchar_t> [char.traits.specializations.wchar.t]
[🔗](#lib:char_traits)
namespace std {template<> struct char_traits<wchar_t> {using char_type = wchar_t; using int_type = wint_t; using off_type = streamoff; using pos_type = wstreampos; using state_type = mbstate_t; using comparison_category = strong_ordering; static constexpr void assign(char_type& c1, const char_type& c2) noexcept; static constexpr bool eq(char_type c1, char_type c2) noexcept; static constexpr bool lt(char_type c1, char_type c2) noexcept; static constexpr int compare(const char_type* s1, const char_type* s2, size_t n); static constexpr size_t length(const char_type* s); static constexpr const char_type* find(const char_type* s, size_t n, const char_type& a); static constexpr char_type* move(char_type* s1, const char_type* s2, size_t n); static constexpr char_type* copy(char_type* s1, const char_type* s2, size_t n); static constexpr char_type* assign(char_type* s, size_t n, char_type a); static constexpr int_type not_eof(int_type c) noexcept; static constexpr char_type to_char_type(int_type c) noexcept; static constexpr int_type to_int_type(char_type c) noexcept; static constexpr bool eq_int_type(int_type c1, int_type c2) noexcept; static constexpr int_type eof() noexcept; };}
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/strings.tex#L497)
The two-argument membersassign,eq,
andlt are defined identically
to the built-in operators=,==,
and<,
respectively[.](#1.sentence-1)
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/strings.tex#L511)
The membereof() returnsWEOF[.](#2.sentence-1)