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std::wcsxfrm

De cppreference.com
< cpp‎ | string‎ | wide

 
 
Bibliothèque de chaînes de caractères
Chaînes à zéro terminal
Original:
Null-terminated strings
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Les chaînes d'octets
Chaines multi-octets
Les chaînes étendues
Classes
Original:
Classes
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basic_string
char_traits
 
Chaînes à zéro terminal de large
Fonctions
Original:
Functions
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Manipulation caractère
Original:
Character manipulation
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Conversion aux formats numériques
Original:
Conversions to numeric formats
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La manipulation de chaînes
Original:
String manipulation
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La manipulation des tableaux
Original:
Array manipulation
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wmemcpy
wmemmove
wmemcmp
wmemchr
wmemset
 
Defined in header <cwchar>
std::size_t strxfrm( const wchar_t* dest, const wchar_t* src, std::size_t count );
Transforme la chaîne se terminant par null large pointé par src dans la forme définie par l'implémentation de telle sorte que la comparaison de deux chaînes transformées avec std::wcscmp donne le même résultat que la comparaison des chaînes d'origine avec std::wcscoll, dans la locale courante C .
Original:
Transforms the null-terminated wide string pointed to by src into the implementation-defined form such that comparing two transformed strings with std::wcscmp gives the same result as comparing the original strings with std::wcscoll, in the current C locale.
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Les caractères count première de la chaîne transformée de destination sont écrites, y compris le caractère nul final, et la longueur de la chaîne complète transformée est renvoyée, à l'exclusion du caractère nul final .
Original:
The first count characters of the transformed string are written to destination, including the terminating null character, and the length of the full transformed string is returned, excluding the terminating null character.
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Si count est 0, puis dest est autorisé à être un pointeur nul .
Original:
If count is 0, then dest is allowed to be a null pointer.
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Sommaire

[modifier] Notes

La bonne longueur de la mémoire tampon qui peut recevoir la chaîne entière est transformée 1+std::wcsxfrm(NULL, src, 0)
Original:
The correct length of the buffer that can receive the entire transformed string is 1+std::wcsxfrm(NULL, src, 0)
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[modifier] Paramètres

dest -
pointeur vers le premier élément d'une largeur nulle à terminaison de chaîne pour écrire la chaîne transformée de
Original:
pointer to the first element of a wide null-terminated string to write the transformed string to
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src -
pointeur vers la chaîne à zéro terminal de caractères larges à transformer
Original:
pointer to the null-terminated wide character string to transform
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count -
Le nombre de caractères de sortie
Original:
maximum number of characters to output
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[modifier] Retourne la valeur

La longueur de la chaîne transformée de large, non compris le caractère de fin NULL .
Original:
The length of the transformed wide string, not including the terminating null-character.
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[modifier] Exemple

#include <iostream>
#include <cwchar>
 
int main()
{
    std::setlocale(LC_ALL, "sv_SE.utf8");
 
    std::wstring in1 = L"\u00e5r";
    std::wstring out1(1+std::wcsxfrm(nullptr, in1.c_str(), 0), L' ');
    std::wstring in2 = L"\u00e4ngel";
    std::wstring out2(1+std::wcsxfrm(nullptr, in2.c_str(), 0), L' ');
 
    std::wcsxfrm(&out1[0], in1.c_str(), out1.size());
    std::wcsxfrm(&out2[0], in2.c_str(), out2.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 lexicographical comparison: ";
    if(in1 < in2)
         std::wcout << in1 << " before " << in2 << '\n';
    else
         std::wcout << in2 << " before " << in1 << '\n';
 
}

Résultat :

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

[modifier] Voir aussi

transformer une chaîne de sorte que strcmp produirait le même résultat que strcoll
Original:
transform a string so that strcmp would produce the same result as strcoll
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(fonction) [edit]
[
virtuel
Original:
virtual
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]
transforme une chaîne de classement de sorte que peut être remplacé par des comparaisons
Original:
transforms a string so that collation can be replaced by comparison
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(fonction membre virtuelle protégée de std::collate) [edit]
compare deux chaînes de large, conformément à la localisation en cours
Original:
compares two wide strings in accordance to the current locale
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(fonction) [edit]
C documentation for wcsxfrm