std::basic_string::compare

 

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)

 

int compare(const basic_string& str )const;	(1)
int compare( size_type pos1, size_type count1,              const basic_string& str )const;	(2)
int compare( size_type pos1, size_type count1,              const basic_string& str,              size_type pos2, size_type count2 )const;	(3)
int compare(const CharT* s )constnoexcept;	(4)
int compare( size_type pos1, size_type count1,              const CharT* s )const;	(5)
int compare( size_type pos1, size_type count1,              const CharT* s, size_type count2 )const;	(6)

Confronta due sequenze di caratteri.

Original:

Compares two character sequences.

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1)

Confronta questa stringa str'. In primo luogo, calcola il numero di caratteri da confrontare, come per size_type rlen =std::min(size(), str.size()). Confronta, poi, chiamando Traits::compare(data(), str.data(), rlen). Per le stringhe standard, questa funzione esegue carattere per carattere di confronto lessicografico. Se il risultato è zero (le stringhe sono uguali finora), quindi le loro dimensioni sono confrontati come segue:

Original:

Compares this string to str. First, calculates the number of characters to compare, as if by size_type rlen =std::min(size(), str.size()). Then compares by calling Traits::compare(data(), str.data(), rlen). For standard strings this function performs character-by-character lexicographical comparison. If the result is zero (the strings are equal so far), then their sizes are compared as follows:

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Condition		Result	Return value
Traits::compare(data, arg, rlen) < 0		data is less than arg	<0
Traits::compare(data, arg, rlen) == 0	size(data) < size(arg)	data is less than arg	<0
	size(data) == size(arg)	data is equal to arg	​0​
	size(data) > size(arg)	data is greater than arg	>0
Traits::compare(data, arg, rlen) > 0		data is greater than arg	>0

2)

Confronta una sottostringa [pos1, pos1+count1) di questa stringa di str' come per basic_string(*this, pos1, count1).compare(str)

Original:

Compares a [pos1, pos1+count1) substring of this string to str as if by basic_string(*this, pos1, count1).compare(str)

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3)

Confronta una sottostringa [pos1, pos1+count1) di questa stringa per una sottostringa [pos2, pas2+count2) di str' come per basic_string(*this, pos1, count1).compare(basic_string(str, pos2, count2))

Original:

Compares a [pos1, pos1+count1) substring of this string to a substring [pos2, pas2+count2) of str as if by basic_string(*this, pos1, count1).compare(basic_string(str, pos2, count2))

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4)

Confronta questa stringa alla terminazione Null inizio sequenza di caratteri in corrispondenza del carattere puntato da' s, come per compare(basic_string(s))

Original:

Compares this string to the null-terminated character sequence beginning at the character pointed to by s, as if by compare(basic_string(s))

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5)

Confronta una sottostringa [pos1, pos1+count1) di questa stringa alla terminazione Null inizio sequenza di caratteri in corrispondenza del carattere puntato da' s, come per basic_string(*this, pos, count1).compare(basic_string(s))

Original:

Compares a [pos1, pos1+count1) substring of this string to the null-terminated character sequence beginning at the character pointed to by s, as if by basic_string(*this, pos, count1).compare(basic_string(s))

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6)

Confronta una sottostringa [pos1, pos1+count1) di questa stringa di caratteri count2 primi array di caratteri il cui primo carattere è puntato da' s, come per basic_string(*this, pos, count1).compare(basic_string(s, count2)). (Nota: i caratteri da ss+count2 a possono includere caratteri null))

Original:

Compares a [pos1, pos1+count1) substring of this string to the first count2 characters of the character array whose first character is pointed to by s, as if by basic_string(*this, pos, count1).compare(basic_string(s, count2)). (Note: the characters from s to s+count2 may include null characters))

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Parametri

str	-	altra stringa da confrontare Original: other string to compare to The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
s	-	puntatore alla stringa di caratteri da confrontare Original: pointer to the character string to compare to The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
count1	-	numero di caratteri di questa stringa per compore Original: number of characters of this string to compore The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
pos1	-	posizione del primo carattere in questa stringa da confrontare Original: position of the first character in this string to compare The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
count2	-	numero di caratteri della stringa specificata compore Original: number of characters of the given string to compore The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
pos2	-	posizione del primo carattere della stringa data da confrontare Original: position of the first character of the given string to compare 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

valore negativo se la stringa è meno rispetto alla sequenza di caratteri altra, zero se le due sequenze di caratteri sono uguali, valore positivo se la stringa è superiore rispetto alla sequenza di caratteri altro.

Original:

negative value if this string is less than the other character sequence, zero if the both character sequences are equal, positive value if this string is greater than the other character sequence.

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Eccezioni

1)

noexcept specification:  

noexcept

  (dal C++11)

2-6)

Può generare le eccezioni generate dai costruttori basic_string corrispondenti.

Original:

May throw the exceptions thrown by the corresponding basic_string constructors.

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Possibile implementazione

template<class CharT, class Traits, class Alloc>int basic_string<CharT, Traits, Alloc>::compare(conststd::basic_string& str)constnoexcept{ size_type lhs_sz = size(); size_type rhs_sz = str.size();int result = traits_type::compare(data(), str.data(), std::min(lhs_sz, rhs_sz));if(result !=0)return result;if(lhs_sz < rhs_sz)return-1;if(lhs_sz > rhs_sz)return1;return0;}

Vedi anche

operator== operator!= operator< operator> operator<= operator>=	confronta due stringhe secondo l'ordine lessicografico (funzione di modello)
substr	restituisce una sottostringa (metodo pubblico)
collate	definisce il confronto lessicografico e hashing delle stringhe Original: defines lexicographical comparison and hashing of strings The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe template)
strcoll	confronta due stringhe in accordo con i parametri locali Original: compares two strings in accordance to the current locale The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione)