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std::strxfrm

Da cppreference.com
< cpp‎ | string‎ | byte

 
 
Biblioteca cordas
Strings terminadas
Original:
Null-terminated strings
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Cadeias de bytes
Multibyte cordas
Cordas de largura
Classes
Original:
Classes
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basic_string
char_traits
 
Cordas de terminação nula de bytes
Funções
Original:
Functions
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Manipulação personagem
Original:
Character manipulation
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Conversões para formatos numéricos
Original:
Conversions to numeric formats
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Manipulação de cadeia
Original:
String manipulation
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strcpy
strncpy
strcat
strncat
strxfrm
Exame String
Original:
String examination
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Manipulação de memória
Original:
Memory manipulation
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memchr
memcmp
memset
memcpy
memmove
Diversos
Original:
Miscellaneous
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strerror
 
Defined in header <cstring>
std::size_t strxfrm( const char* dest, const char* src, std::size_t count );
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.
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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.
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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.
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Índice

[editar] 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)
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[editar] 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
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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
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count -
número máximo de caracteres a serem escritos
Original:
maximum number of characters to be written
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[editar] 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.
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[editar] 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';
 
}

Output:

In the Czech locale: hrnec before chrt
In lexicographical comparison: chrt before hrnec

[editar] Veja também

transformar uma string de largura para que wcscmp produziria o mesmo resultado que wcscoll
Original:
transform a wide string so that wcscmp would produce the same result as wcscoll
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(função) [edit]
[virtual]
transforma uma cadeia de caracteres de modo a que agrupamento pode ser substituído por comparação
Original:
transforms a string so that collation can be replaced by comparison
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(virtual protegido of std::collate função de membro) [edit]
compara duas seqüências de acordo com a localidade
Original:
compares two strings in accordance to the current locale
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(função) [edit]
C documentation for strxfrm