Namespace
Varianti

std::collate::transform, std::collate::do_transform

Da cppreference.com.
< cpp‎ | locale‎ | collate

 
 
Localizzazioni libreria
Impostazioni internazionali e sfaccettature
Original:
Locales and facets
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locale
Carattere classificazione
Original:
Character classification
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Conversioni
Original:
Conversions
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Facet categoria classi di base
Original:
Facet category base classes
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Facet categorie
Original:
Facet categories
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Locale specifici aspetti
Original:
Locale-specific facets
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Codice di conversione sfaccettature
Original:
Code conversion facets
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codecvt_utf8(C++11)
codecvt_utf16(C++11)
C locale
Original:
C locale
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std::collate
Membri funzioni
Original:
Member functions
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collate::collate
collate::~collate
collate::compare
collate::do_compare
collate::transform
collate::do_transform
collate::hash
collate::do_hash
 
Defined in header <locale>
public:
string_type transform( const CharT* low, const CharT* high ) const;
(1)
protected:
string_type do_transform( const CharT* low, const CharT* high ) const;
(2)
1)
funzione membro pubblica, chiama il virtuale protetto do_transform funzione membro della classe più derivata.
Original:
public member function, calls the protected virtual member function do_transform of the most derived class.
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2)
Converte il [low, high) sequenza di caratteri di una stringa che, in confronto lessicografico (ad esempio con operator< per le stringhe), con il risultato della chiamata transform() in un'altra stringa, produce lo stesso risultato a chiamare do_compare() sugli stessi due fili.
Original:
Converts the character sequence [low, high) to a string that, compared lexicographically (e.g. with operator< for strings) with the result of calling transform() on another string, produces the same result as calling do_compare() on the same two strings.
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Indice

[modifica] Parametri

low -
puntatore al primo carattere della sequenza di trasformare
Original:
pointer to the first character in the sequence to transform
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high -
uno passato il puntatore terminale per la sequenza di trasformare
Original:
one past the end pointer for the sequence to transform
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[modifica] Valore di ritorno

La stringa trasformata in modo che il confronto lessicografico delle stringhe trasformati possono essere utilizzati al posto di raccolta degli originali. Nel locale "C", la stringa restituita è la copia esatta di [low, high). In altri luoghi, il contenuto della stringa restituita sono definiti dall'implementazione, e la dimensione può essere considerevolmente più lungo.
Original:
The string transformed so that lexicographic comparison of the transformed strings may be used instead of collating of the originals. In the "C" locale, the returned string is the exact copy of [low, high). In other locales, the contents of the returned string are implementation-defined, and the size may be considerably longer.
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[modifica] Note

Oltre al l'uso in confronto, l'attuazione formato specifico della stringa trasformato è noto std :: regex_traits <> :: transform_primary, che è in grado di estrarre le informazioni equivalenza classe.
Original:
In addition to the the use in collation, the implementation-specific format of the transformed string is known to std :: regex_traits <> :: transform_primary, which is able to extract the equivalence class information.
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[modifica] Esempio

#include <iostream>
#include <iomanip>
#include <locale>
 
int main()
{
    std::locale::global(std::locale("sv_SE.utf8"));
    auto& f = std::use_facet<std::collate<wchar_t>>(std::locale());
 
    std::wstring in1 = L"\u00e4ngel";
    std::wstring in2 = L"\u00e5r";
 
    std::wstring out1 = f.transform(&in1[0], &in1[0] + in1.size());
    std::wstring out2 = f.transform(&in2[0], &in2[0] + in2.size());
 
    std::wcout << "In the Swedish locale: ";
    if(out1 < out2)
         std::wcout << in1 << " before " << in2 << '\n';
    else
         std::wcout << in2 << " before " << in1 << '\n';
 
    std::wcout << "In lexicographic comparison: ";
    if(in1 < in2)
         std::wcout << in1 << " before " << in2 << '\n';
    else
         std::wcout << in2 << " before " << in1 << '\n';
 
}

Output:

In the Swedish locale: år before ängel
In lexicographic comparison: ängel before år

[modifica] Vedi anche

trasformare una stringa in modo che strcmp produrrebbe lo stesso risultato strcoll
Original:
transform a string so that strcmp would produce the same result as strcoll
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(funzione) [edit]
trasformare una stringa larga in modo che wcscmp produrrebbe lo stesso risultato wcscoll
Original:
transform a wide string so that wcscmp would produce the same result as wcscoll
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(funzione) [edit]