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cpp/string/basic string/front : Différence entre versions

De cppreference.com
< cpp‎ | string‎ | basic string
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{{tr|Retourne référence au premier caractère de la chaîne .|Returns reference to the first character in the string.}}
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Retourne référence au premier caractère de la chaîne. |}}
  
 
===Paramètres===
 
===Paramètres===
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===Retourne la valeur===
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{{tr|référence au premier caractère .|reference to the first character.}}
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référence au premier caractère|}}
  
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===Complexité===
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Constante
  
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===Voir aussi===
 
===Voir aussi===
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Version actuelle en date du 19 janvier 2019 à 10:34

 
C++
 
Bibliothèque de chaînes de caractères
Chaînes à zéro terminal
Original:
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
Original:
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
Original:
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
Original:
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
Original:
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
Original:
Constants
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basic_string::npos
Tiers fonctions
Original:
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
Original:
Helper classes
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hash<std::string>
hash<std::wstring>
hash<std::u32string>
hash<std::u16string>		 (C++11)
 
CharT& front();
 (depuis C++11)
const CharT& front() const;
 (depuis C++11)

Retourne une référence au premier caractère de la chaîne. Le comportement n'est pas défini si empty() == true.

Sommaire

[modifier] Paramètres

(aucun)

[modifier] Valeur de retour

référence au premier caractère, équivalent à operator[](0).

[modifier] Complexity

Constante

[modifier] Example

#include <iostream>
#include <string>
 
int main()
{
  {
    std::string s("Exemplary");
    char& f = s.front();
    f = 'e';
    std::cout << s << '\n'; // "exemplary"
  }
 
  {
    std::string const c("Exemplary");
    char const& f = c.front();
    std::cout << &f << '\n'; // "Exemplary"
  }
}

Résultat : 

exemplary
Exemplary

[modifier] Voir aussi

(C++11)
 accède au dernier caractère
(fonction membre publique) [edit]
Récupérée de « https://fr.cppreference.com/mwiki/index.php?title=cpp/string/basic_string/front&oldid=50215 »