std::wcsxfrm – cppreference.com

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definiert in Header `<cwchar>`

`std::size_t strxfrm( const wchar_t* dest, const wchar_t* src, std::size_t count );`

Verwandelt den nullterminierten breite String, auf den src in die Implementierung definiert Form, so dass den Vergleich zweier verwandelt Strings mit std::wcscmp das gleiche Ergebnis wie das Vergleichen der ursprünglichen Strings mit std::wcscoll in der aktuellen C locale .

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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Die ersten count Zeichen des transformierten Kette sind Ziel geschrieben, einschließlich des abschließenden Null-Zeichen, und die Länge des vollständigen verwandelt String zurückgegeben, ohne das abschließende Nullzeichen .

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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Wenn count ist 0, dann dest darf ein NULL-Zeiger sein .

Original:

If count is 0, then dest is allowed to be a null pointer.

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Notes

Die richtige Länge des Puffers, der den gesamten transformierten String empfangen kann 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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Parameter

dest	-	Zeiger auf das erste Element einer breiten nullterminierten String, um die transformierten Kette zu schreiben Original: pointer to the first element of a wide null-terminated string to write the transformed string to The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
src	-	Zeiger auf die null-terminierte breite Zeichenfolge zu verwandeln Original: pointer to the null-terminated wide character string to transform The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
count	-	maximale Anzahl von Zeichen ausgegeben Original: maximum number of characters to output The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Rückgabewert

Die Länge des transformierten breite string, ohne das abschließende Null-Zeichen .

Original:

The length of the transformed wide string, not including the terminating null-character.

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Beispiel

#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';

}

Output:

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

Siehe auch


strxfrm	verwandeln einen String, so dass strcmp das gleiche Ergebnis wie strcoll erzeugen würde Original: transform a string so that strcmp would produce the same result as strcoll The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion) [edit]

do_transform [virtuell]	wandelt einen String, so dass collation durch Vergleich ersetzt werden können Original: transforms a string so that collation can be replaced by comparison The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (virtuellen geschützten Member-Funktion of `std::collate`) [edit]

wcscoll	vergleicht zwei Wide-Strings in Übereinstimmung mit dem aktuellen Gebietsschema Original: compares two wide 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. (Funktion) [edit]

C documentation for wcsxfrm