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std::literals::string_literals::operator""s

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Bibliothèque de chaînes de caractères
Chaînes à zéro terminal
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Null-terminated strings
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Les chaînes d'octets
Chaines multi-octets
Les chaînes étendues
Classes
Original:
Classes
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basic_string
char_traits
 
std::basic_string
Les fonctions membres
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Member functions
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basic_string::basic_string
basic_string::operator=
basic_string::assign
basic_string::get_allocator
Elément d'accès
Original:
Element access
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basic_string::at
basic_string::operator[]
basic_string::front (C++11)
basic_string::back (C++11)
basic_string::data
basic_string::c_str
Les itérateurs
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Iterators
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basic_string::begin
basic_string::cbegin

(C++11)
basic_string::end
basic_string::cend

(C++11)
basic_string::rbegin
basic_string::crbegin

(C++11)
basic_string::rend
basic_string::crend

(C++11)
Capacité
Original:
Capacity
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basic_string::empty
basic_string::size
basic_string::length
basic_string::max_size
basic_string::reserve
basic_string::capacity
basic_string::shrink_to_fit (C++11)
Opérations
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Operations
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basic_string::clear
basic_string::insert
basic_string::erase
basic_string::push_back
basic_string::pop_back (C++11)
basic_string::append
basic_string::operator+=
basic_string::compare
basic_string::replace
basic_string::substr
basic_string::copy
basic_string::resize
basic_string::swap
Recherche
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Search
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basic_string::find
basic_string::rfind
basic_string::find_first_of
basic_string::find_first_not_of
basic_string::find_last_of
basic_string::find_last_not_of
Constantes
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Constants
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basic_string::npos
Tiers fonctions
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Non-member functions
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operator+
operator==
operator!=
operator<
operator>
operator<=
operator>=
swap(std::basic_string)
operator<<
operator>>
getline
stoi
stol
stoll
(C++11)
(C++11)
(C++11)
stoul
stoull
(C++11)
(C++11)
stof
stod
stold
(C++11)
(C++11)
(C++11)
to_string (C++11)
to_wstring (C++11)
Classes d'aide
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Helper classes
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hash<std::string>
hash<std::wstring>
hash<std::u32string>
hash<std::u16string>
(C++11)
 
<tbody> </tbody>
Déclaré dans l'en-tête <string>
string operator "" s(const char *str, std::size_t len);
(1) (depuis C++14)
u8string operator "" s(const char8_t *str, std::size_t len);
(2)
u16string operator "" s(const char16_t *str, std::size_t len);
(3) (depuis C++14)
u32string operator "" s(const char32_t *str, std::size_t len);
(4) (depuis C++14)
wstring operator "" s(const wchar_t *str, std::size_t len);
(5) (depuis C++14)

Forme une chaîne de caractères du type désiré.

1) retourne std::string{str, len}
2) retourne std::u8string{str, len}
3) retourne std::u16string{str, len}
4) retourne std::u32string{str, len}
5) retourne std::wstring{str, len}

Paramètres

str - pointeur vers le début de la chaîne de caractères brute
len - longueur de la chaîne de caractères brute

Valeur de retour

La chaîne de caractères.

Notes

Ces opérateurs sont déclarés dans l'espace de nommage std::literals::string_literals, où literals et string_literals sont inline. L'accès à ces opérateurs peut être obtenu via using namespace std::literals, using namespace std::string_literals, et using namespace std::literals::string_literals.

std::chrono::duration définit également operator""s, pour représenter les secondes littérales, mais c'est une littérale arithmétique: 10.0s et 10s représentent dix secondes, mais "10"s est une chaîne de caractères.

Exemple

#include <string>
#include <iostream>

int main()
{
    using namespace std::string_literals;

    std::string s1 = "abc\0\0def";
    std::string s2 = "abc\0\0def"s;
    std::cout << "s1: " << s1.size() << " \"" << s1 << "\"\n";
    std::cout << "s2: " << s2.size() << " \"" << s2 << "\"\n";
}

Résultat possible :

s1: 3 "abc"
s2: 8 "abc^@^@def"

See also

construit un basic_string
Original:
constructs a basic_string
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(fonction membre publique) [edit]