std::basic_string::find

 

C++

Linguaggio

Concetti

Libreria di Utilità

Stringhe

Contenitori

Algoritmi

Iteratori

Libreria matematca

Input/output

Localizzazione

Espressioni regolari(C++11)

Operazioni atomicche(C++11)

Multithreading(C++11)

 

Stringhe libreria

Null-stringhe terminate Original: Null-terminated strings The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Byte stringhe

Multibyte stringhe

Stringhe larghe

Classi Original: Classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string

char_traits

 

std::basic_string

Membri funzioni Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string::basic_string

basic_string::operator=

basic_string::assign

basic_string::get_allocator

Elemento accesso Original: Element access The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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 Original: Operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string::npos

Non membri funzioni Original: Non-member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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 Original: Helper classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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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Parametri

str	-	stringa da ricercare Original: string to search for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
count	-	lunghezza della stringa da cercare Original: length of substring to search for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
s	-	puntatore a una stringa di caratteri per cercare i per Original: pointer to a character string to seach for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
ch	-	carattere da cercare Original: character to search for The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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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Esempio

#include <string>#include <iostream>   void print(std::string::size_type n, std::stringconst&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::stringconst 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

Vedi anche

rfind	trova l'ultima occorrenza di una sottostringa (metodo pubblico)
find_first_of	trovare prima occorrenza di caratteri Original: find first occurrence of characters The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)
find_first_not_of	trovare prima assenza di caratteri Original: find first absence of characters The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)
find_last_of	trovare ultima occorrenza di caratteri Original: find last occurrence of characters The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)
find_last_not_of	trovare assenza ultima di caratteri Original: find last absence of characters The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)