Namespace
Varianti

std::basic_string::find

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< cpp‎ | string‎ | basic string

 
 
Stringhe libreria
Null-stringhe terminate
Original:
Null-terminated strings
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Byte stringhe
Multibyte stringhe
Stringhe larghe
Classi
Original:
Classes
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basic_string
char_traits
 
std::basic_string
Membri funzioni
Original:
Member functions
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basic_string::basic_string
basic_string::operator=
basic_string::assign
basic_string::get_allocator
Elemento accesso
Original:
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
basic_string::c_str
Iteratori
Original:
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
Original:
Capacity
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basic_string::empty
basic_string::size
basic_string::length
basic_string::max_size
basic_string::reserve
basic_string::capacity
basic_string::shrink_to_fit(C++11)
Operazioni
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Operations
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basic_string::clear
basic_string::insert
basic_string::erase
basic_string::push_back
basic_string::pop_back(C++11)
basic_string::append
basic_string::operator+=
basic_string::compare
basic_string::replace
basic_string::substr
basic_string::copy
basic_string::resize
basic_string::swap
Cerca
Original:
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+
operator==
operator!=
operator<
operator>
operator<=
operator>=
swap(std::basic_string)
operator<<
operator>>
getline
stoi
stol
stoll
(C++11)
(C++11)
(C++11)
stoul
stoull
(C++11)
(C++11)
stof
stod
stold
(C++11)
(C++11)
(C++11)
to_string(C++11)
to_wstring(C++11)
Helper classi
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Helper classes
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hash<std::string>
hash<std::wstring>
hash<std::u32string>
hash<std::u16string>
(C++11)
 
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)
Trova la prima sottostringa uguale alla sequenza di caratteri dato. Ricerca inizia pos, vale a dire la sottostringa trovata non deve iniziare in una posizione che precede pos.
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)
Trova la prima sottostringa uguale a str.
Original:
Finds the first substring equal to str.
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2)
Trova la prima sottostringa uguali ai caratteri count prima della stringa di caratteri puntata da s. s possono includere caratteri nulli.
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)
Trova la prima sottostringa uguale alla stringa di caratteri puntata da s. La lunghezza della stringa è determinata dal carattere null prima.
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)
Trova il ch primo carattere.
Original:
Finds the first character ch.
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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 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

[modifica] Vedi anche

trovare l'ultima occorrenza di una sottostringa
Original:
find the last occurrence of a substring
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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]