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

De cppreference.com
< cpp‎ | locale‎ | collate

 
 
Localizaciones biblioteca
Locales y facetas
Original:
Locales and facets
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locale
Carácter clasificación
Original:
Character classification
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Conversiones
Original:
Conversions
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Facet clases categoría base
Original:
Facet category base classes
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Categorías faceta
Original:
Facet categories
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Específico de la localidad facetas
Original:
Locale-specific facets
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Facetas código de conversión
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
Las funciones miembro
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)
función miembro pública, llama a la función virtual protegido do_transform miembro de la clase más derivada .
Original:
public member function, calls the protected virtual member function do_transform of the most derived class.
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2)
Convierte el [low, high) secuencia de caracteres en una cadena que, en comparación lexicográficamente (por ejemplo, con operator< para cadenas) con el resultado de la llamada transform() en otra cadena, produce el mismo resultado como llamar do_compare() en los mismos dos cadenas .
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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Contenido

[editar] Parámetros

low -
puntero al primer carácter de la secuencia a transformar
Original:
pointer to the first character in the sequence to transform
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high -
uno pasado el puntero del extremo de la secuencia para transformar
Original:
one past the end pointer for the sequence to transform
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[editar] Valor de retorno

La cadena transformada para que la comparación lexicográfica de las cadenas transformadas puede ser utilizado en lugar de una recopilación de los originales. En la localización "C", la cadena devuelta es la copia exacta de [low, high). En otros lugares, el contenido de la cadena devuelta son definido por la implantación, y el tamaño puede ser considerablemente más largo .
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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[editar] Notas

Además de la utilización en la intercalación, el formato específico de la implementación de la cadena transformada se sabe que std :: regex_traits <> :: transform_primary, que es capaz de extraer la información de clase de equivalencia .
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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[editar] Ejemplo

#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

[editar] Ver también

transformar una cadena para que strcmp produciría el mismo resultado que strcoll
Original:
transform a string so that strcmp would produce the same result as strcoll
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(función) [edit]
transformar una cadena de ancho para que wcscmp produciría el mismo resultado que wcscoll
Original:
transform a wide string so that wcscmp would produce the same result as wcscoll
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(función) [edit]