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std::basic_string::rfind

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< cpp‎ | string‎ | basic string
Revision as of 11:02, 2 November 2012 by P12bot (Talk | contribs)

 
 
 
std::basic_string
 

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<td >
size_type rfind( const basic_string& str, size_type pos = npos ) const;
</td>

<td > (1) </td> <td class="t-dcl-nopad"> </td> </tr> <tr class="t-dcl-sep"><td></td><td></td><td></td></tr>

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<td >
size_type rfind( const CharT* s, size_type pos, size_type count ) const;
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<td >
size_type rfind( const CharT* s, size_type pos = npos ) const;
</td>

<td > (3) </td> <td class="t-dcl-nopad"> </td> </tr> <tr class="t-dcl-sep"><td></td><td></td><td></td></tr>

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<td >
size_type rfind( CharT ch, size_type pos = npos ) const;
</td>

<td > (4) </td> <td class="t-dcl-nopad"> </td> </tr> Template:ddcl list end

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 Template:rlpt 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.

Contents

Parameters

str - string to search for
count - length of substring to search for
s - pointer to a character string to seach for
ch - character to search for

Return value

position of the first character of the found substring or Template:rlpt if no such substring is found.

Example

#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

See also

Template:cpp/string/basic string/dcl list findTemplate:cpp/string/basic string/dcl list find first ofTemplate:cpp/string/basic string/dcl list find first not ofTemplate:cpp/string/basic string/dcl list find last ofTemplate:cpp/string/basic string/dcl list find last not of