std::strxfrm
De cppreference.com
<metanoindex/>
<tbody> </tbody>| Definido no cabeçalho <cstring>
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std::size_t strxfrm( const char* dest, const char* src, std::size_t count ); |
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Transforma a seqüência de bytes terminada em nulo apontado por
src na forma definida pela implementação de tal forma que comparar duas cadeias transformadas com std::strcmp dá o mesmo resultado que comparando as cordas originais com std::strcoll, na localidade C atual.Original:
Transforms the null-terminated byte string pointed to by
src into the implementation-defined form such that comparing two transformed strings with std::strcmp gives the same result as comparing the original strings with std::strcoll, in the current C locale.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Os personagens
count primeiro da cadeia transformado são escritas para o destino, incluindo o caractere nulo de terminação, eo comprimento da corda cheia transformado é devolvido, excluindo o caractere nulo de terminação.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.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Se
count é 0, então dest é permitido ser um ponteiro nulo.Original:
If
count is 0, then dest is allowed to be a null pointer.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Notas
O comprimento correto do buffer que pode receber toda a cadeia transformada é
1+std::strxfrm(NULL, src, 0)Original:
The correct length of the buffer that can receive the entire transformed string is
1+std::strxfrm(NULL, src, 0)The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Parâmetros
| dest | - | ponteiro para o primeiro elemento da matriz, onde a cadeia de transformada será escrito
Original: pointer to the first element of the array where the transformed string will be written The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| src | - | ponteiro para o primeiro caractere de uma seqüência de byte nulo terminada a se transformar
Original: pointer to the first character of a null-terminated byte 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 | - | número máximo de caracteres a serem escritos
Original: maximum number of characters to be written The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Valor de retorno
O comprimento da corda transformado, não incluindo o caractere nulo de terminação-.
Original:
The length of the transformed string, not including the terminating null-character.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Exemplo
#include <iostream>
#include <iomanip>
#include <cstring>
int main()
{
std::setlocale(LC_COLLATE, "cs_CZ.iso88592");
std::string in1 = "hrnec";
std::string out1(1+std::strxfrm(nullptr, in1.c_str(), 0), ' ');
std::string in2 = "chrt";
std::string out2(1+std::strxfrm(nullptr, in2.c_str(), 0), ' ');
std::strxfrm(&out1[0], in1.c_str(), out1.size());
std::strxfrm(&out2[0], in2.c_str(), out2.size());
std::cout << "In the Czech locale: ";
if(out1 < out2)
std::cout << in1 << " before " << in2 << '\n';
else
std::cout << in2 << " before " << in1 << '\n';
std::cout << "In lexicographical comparison: ";
if(in1 < in2)
std::cout << in1 << " before " << in2 << '\n';
else
std::cout << in2 << " before " << in1 << '\n';
}
Saída:
In the Czech locale: hrnec before chrt
In lexicographical comparison: chrt before hrnec