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std::basic_string::operator basic_string_view

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< cpp‎ | string‎ | basic string
 
 
Bibliothèque de chaînes de caractères
Chaînes à zéro terminal
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Null-terminated strings
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Classes
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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
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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
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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
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Capacity
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basic_string::empty
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basic_string::length
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basic_string::shrink_to_fit (C++11)
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Operations
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basic_string::clear
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Recherche
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Search
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basic_string::find
basic_string::rfind
basic_string::find_first_of
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basic_string::find_last_of
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Constantes
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Constants
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basic_string::npos
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operator+
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swap(std::basic_string)
operator<<
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getline
stoi
stol
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(C++11)
(C++11)
stoul
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(C++11)
(C++11)
stof
stod
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(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)
 
operator std::basic_string_view<CharT, Traits>()constnoexcept;
constexpr operator std::basic_string_view<CharT, Traits>()constnoexcept;

Retourne une std::basic_string_view, construite de manière équivalente à std::basic_string_view<CharT, Traits>(data(), size())

Sommaire

[modifier]Paramètres

(aucun)

[modifier]Valeur de retour

Une vue représentant l'entièreté du contenu de la chaîne de caractères.

[modifier]Exemple

#include <iostream>#include <string>#include <string_view>   void show_wstring_size(std::wstring_view wcstr_v){std::cout<< wcstr_v.size()<<" code points\n";}   int main(){std::string cppstr ="ラーメン";// narrow stringstd::wstring wcstr = L"ラーメン";// wide string   // Implicit conversion from string to string_view// via std::string::operator string_view:std::string_view cppstr_v = cppstr;   std::cout<< cppstr_v <<'\n'<< cppstr_v.size()<<" code units\n";   // Implicit conversion from wstring to wstring_view// via std::wstring::operator wstring_view: show_wstring_size(wcstr);   // Warning:// It is the programmer's responsibility to ensure that std::string_view // does not outlive the pointed-to string!    std::string_view BAD(std::string("a temporary string"));// holds a dangling pointer!}

Résultat :

ラーメン 12 code units 4 code points

[modifier]Voir aussi

Modèle:cpp/string/basic string view/dsc constructor
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