Namespace
Varianti

std::basic_string::rfind

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< cpp‎ | string‎ | basic string

 
 
Stringhe libreria
Null-stringhe terminate
Original:
Null-terminated strings
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Multibyte stringhe
Stringhe larghe
Classi
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Classes
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basic_string
char_traits
 
std::basic_string
Membri funzioni
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Member functions
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basic_string::basic_string
basic_string::operator=
basic_string::assign
basic_string::get_allocator
Elemento accesso
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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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Iteratori
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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)
Capacità
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Capacity
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basic_string::empty
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Operations
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Cerca
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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
Costanti
Original:
Constants
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basic_string::npos
Non membri funzioni
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Non-member functions
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operator+
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getline
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(C++11)
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to_string(C++11)
to_wstring(C++11)
Helper classi
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Helper classes
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hash<std::u16string>
(C++11)
 
size_type rfind( const basic_string& str, size_type pos = npos ) const;
(1)
size_type rfind( const CharT* s, size_type pos, size_type count ) const;
(2)
size_type rfind( const CharT* s, size_type pos = npos ) const;
(3)
size_type rfind( CharT ch, size_type pos = npos ) const;
(4)

Finds the last substring equal to the given character sequence. Search begins at pos, i.e. only the substring [0, pos) is considered in the search. If npos is passed as pos whole string will be searched.

1) Finds the last substring equal to str.

2) Finds the last substring equal to the first count characters of the character string pointed to by s. s can include null characters.

3) Finds the last substring equal to the character string pointed to by s. The length of the string is determined by the first null character.

4) Finds the last character ch.

Indice

[modifica] Parametri

str -
stringa da ricercare
Original:
string to search for
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count -
lunghezza della stringa da cercare
Original:
length of substring to search for
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s -
puntatore a una stringa di caratteri per cercare i per
Original:
pointer to a character string to seach for
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ch -
carattere da cercare
Original:
character to search for
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[modifica] Valore di ritorno

posizione del primo carattere della sottostringa trovato o npos in mancanza di tale stringa viene trovata.
Original:
position of the first character of the found substring or npos if no such substring is found.
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[modifica] Esempio

#include <string>
#include <iostream>
 
void print(std::string::size_type n, std::string const &s)
{
  if(n == std::string::npos)
    std::cout << "not found\n";
  else
    std::cout << "found: " << s.substr(n) << '\n';
}
 
int main()
{
  std::string::size_type n;
  std::string const s = "This is a string";
 
  // search backwards from beginning of string
  n = s.rfind("is");
  print(n, s);
  // search backwards from position 4
  n = s.rfind("is", 4);
  print(n, s);
  // find a single character
  n = s.rfind('s');
  print(n, s);
  // find a single character
  n = s.rfind('q');
  print(n, s);
}

Output:

found: is a string
found: is is a string
found: string
not found

[modifica] Vedi anche

individuare caratteri della stringa
Original:
find characters in the string
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(membro pubblico funzione) [edit]
trovare prima occorrenza di caratteri
Original:
find first occurrence of characters
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(membro pubblico funzione) [edit]
trovare prima assenza di caratteri
Original:
find first absence of characters
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(membro pubblico funzione) [edit]
trovare ultima occorrenza di caratteri
Original:
find last occurrence of characters
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(membro pubblico funzione) [edit]
trovare assenza ultima di caratteri
Original:
find last absence of characters
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(membro pubblico funzione) [edit]