std::locale::operator()
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<tbody> </tbody> template< class CharT, class Traits, class Alloc > bool operator()( const basic_string<CharT,Traits,Alloc>& s1, const basic_string<CharT,Traits,Alloc>& s2) const; |
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Confronta due argomenti di tipo stringa
s1 s2 e secondo le regole di confronto lessicografiche definite da facet std::collate<charT> questo locale è. Questo operatore permette qualsiasi oggetto locale che ha una faccia di fascicolazione per essere usato come un predicato binario in algoritmi standard (come std::sort) e contenitori ordinate (come std::set)Original:
Compares two string arguments
s1 and s2 according to the lexicographic comparison rules defined by this locale's std::collate<charT> facet. This operator allows any locale object that has a collate facet to be used as a binary predicate in the standard algorithms (such as std::sort) and ordered containers (such as std::set)The text has been machine-translated via Google Translate.
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Parametri
| s1 | - | la prima stringa da confrontare
Original: the first 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. |
| s2 | - | la seconda stringa da confrontare
Original: the second 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
true se s1 è lessicograficamente minore s2, false altrimenti.Original:
true if s1 is lexicographically less than s2, false otherwise.The text has been machine-translated via Google Translate.
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Possibile implementazione
template<class CharT, class Traits, class Alloc >
bool operator()(const std::basic_string<CharT,Traits,Alloc>& s1,
const std::basic_string<CharT,Traits,Alloc>& s2) const;
{
return std::use_facet<std::collate<GharT>>(*this).compare(
s1.data(), s1.data() + s1.size(),
s2.data(), s2.data() + s2.size() ) < 0;
}
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Esempio
Un vettore di stringhe possono essere ordinati in base a una posizione non predefinita locale utilizzando l'oggetto locale come comparatore:
Original:
A vector of strings can be sorted according to a non-default locale by using the locale object as comparator:
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#include <locale>
#include <algorithm>
#include <vector>
#include <string>
#include <cassert>
int main()
{
std::vector<std::wstring> v = {L"жил", L"был", L"кот"};
std::sort(v.begin(), v.end(), std::locale("ru_RU.UTF8"));
assert(v[0] == L"был");
assert(v[1] == L"жил");
assert(v[2] == L"кот");
}
Vedi anche
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) | |