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std::basic_string::rfind

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< cpp‎ | string‎ | basic string

 
 
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Buscar
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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
basic_string::find_last_not_of
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basic_string::npos
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(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.

Contenido

[editar] Parámetros

str -
cadena a buscar
Original:
string to search for
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count -
longitud de la subcadena a buscar
Original:
length of substring to search for
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s -
puntero a una cadena de caracteres para que busque para
Original:
pointer to a character string to seach for
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ch -
carácter que desea buscar
Original:
character to search for
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[editar] Valor de retorno

posición del primer carácter de la subcadena encontrada o si no npos subcadena se encuentra dicho .
Original:
position of the first character of the found substring or npos if no such substring is found.
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[editar] Ejemplo

#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

[editar] Ver también

encontrar caracteres de la cadena
Original:
find characters in the string
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(miembro público función) [edit]
encontrar la primera aparición de caracteres
Original:
find first occurrence of characters
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(miembro público función) [edit]
encontrar la primera ausencia de caracteres
Original:
find first absence of characters
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(miembro público función) [edit]
encontrar la última aparición de caracteres
Original:
find last occurrence of characters
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(miembro público función) [edit]
encontrar última ausencia de caracteres
Original:
find last absence of characters
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(miembro público función) [edit]