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std::basic_string::find

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C++
 
Strings Bibliothek
Null-terminierte Strings
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Null-terminated strings
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Suchen
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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
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basic_string::npos
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size_type find( const basic_string& str, size_type pos = 0 ) const;
 (1)
size_type find( const CharT* s, size_type pos, size_type count ) const;
 (2)
size_type find( const CharT* s, size_type pos = 0 ) const;
 (3)
size_type find( CharT ch, size_type pos = 0 ) const;
 (4)
Sucht das erste substring gleich dem angegebenen Zeichenfolge. Suche beginnt bei pos, dh die gefundene Teilstring darf nicht in einer Position vor pos beginnen .
Original:
Finds the first substring equal to the given character sequence. Search begins at pos, i.e. the found substring must not begin in a position preceding pos.
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1)
Sucht das erste substring gleich str .
Original:
Finds the first substring equal to str.
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2)
Sucht das erste substring gleich den ersten count Zeichen der Zeichenkette, auf die s. s gehören Nullzeichen .
Original:
Finds the first substring equal to the first count characters of the character string pointed to by s. s can include null characters.
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3)
Sucht das erste substring gleich der Zeichenkette, auf die s. Die Länge der Zeichenfolge wird von der ersten Null-Zeichen bestimmt .
Original:
Finds the first substring equal to the character string pointed to by s. The length of the string is determined by the first null character.
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4)
Sucht das erste Zeichen ch .
Original:
Finds the first character ch.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

str -
String zu suchen
Original:
string to search for
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count -
Länge der Zeichenkette zu suchen
Original:
length of substring to search for
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s -
Zeiger auf eine Zeichenfolge zur Suchanfrage
Original:
pointer to a character string to seach for
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ch -
Charakter zu suchen
Original:
character to search for
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[Bearbeiten] Rückgabewert

Position des ersten Zeichens des gefundenen Teilstrings oder npos wenn kein solches Teilstring gefunden .
Original:
position of the first character of the found substring or npos if no such substring is found.
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[Bearbeiten] Beispiel

#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 from beginning of string
    n = s.find("is");
    print(n, s);
 
    // search from position 5
    n = s.find("is", 5);
    print(n, s);
 
    // find a single character
    n = s.find('a');
    print(n, s);
 
    // find a single character
    n = s.find('q');
    print(n, s);
}

Output: 

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

[Bearbeiten] Siehe auch
Sucht das letzte Vorkommen eines Teilstrings
Original:
find the last occurrence of a substring
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(öffentliche Elementfunktion) [edit]
Findet das erste Vorkommen von Zeichen
Original:
find first occurrence of characters
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(öffentliche Elementfunktion) [edit]
finden Sie die erste Abwesenheit von Zeichen
Original:
find first absence of characters
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(öffentliche Elementfunktion) [edit]
Letztes Vorkommen von Zeichen
Original:
find last occurrence of characters
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(öffentliche Elementfunktion) [edit]
Sie letzten Abwesenheit von Zeichen
Original:
find last absence of characters
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(öffentliche Elementfunktion) [edit]
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