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std::basic_string::rfind

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< cpp‎ | string‎ | basic string

 
 
ストリングスライブラリ
NULLで終わる文字列
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Null-terminated strings
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バイト文字列
文字列をマルチバイト
ワイド文字列
クラス
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Classes
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basic_string
char_traits
 
std::basic_string
メンバ関数
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Member functions
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basic_string::basic_string
basic_string::operator=
basic_string::assign
basic_string::get_allocator
要素アクセスの循環参照を解除するために使用されている
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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)
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イテレータ
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Iterators
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basic_string::begin
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(C++11)
basic_string::end
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basic_string::rbegin
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(C++11)
basic_string::rend
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(C++11)
容量
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Capacity
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basic_string::empty
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検索
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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
定数
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Constants
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basic_string::npos
非メンバ関数
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Non-member functions
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operator+
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(C++11)
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Helper classes
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hash<std::string>
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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.

目次

[編集] パラメータ

str -
検索する文字列
Original:
string to search for
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count -
を検索するための文字列の長さ
Original:
length of substring to search for
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s -
※更に用する文字列へのポインタ
Original:
pointer to a character string to seach for
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ch -
文字を検索します
Original:
character to search for
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[編集] 値を返します

そのような部分文字列が見つからなかった場合は見つかった部分文字列またはnposの最初の文字の位置.
Original:
position of the first character of the found substring or npos if no such substring is found.
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[編集]

#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

[編集] も参照してください

文字列内の文字を見つける
Original:
find characters in the string
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(パブリックメンバ関数) [edit]
文字が最初に現れる位置を見つける
Original:
find first occurrence of characters
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(パブリックメンバ関数) [edit]
文字の最初の不在を見つける
Original:
find first absence of characters
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(パブリックメンバ関数) [edit]
文字が最後に現れる場所を見つける
Original:
find last occurrence of characters
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(パブリックメンバ関数) [edit]
最後の文字が存在しないことを見つける
Original:
find last absence of characters
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(パブリックメンバ関数) [edit]