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std::codecvt::max_length, std::codecvt::do_max_length

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< cpp‎ | locale‎ | codecvt

 
 
Bibliothèque localisations
Locales et facettes
Original:
Locales and facets
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locale
Classification des caractères
Original:
Character classification
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Conversions
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Conversions
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Classes de facettes catégorie de base
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Facet category base classes
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Catégories de facettes
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Facet categories
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Spécifique aux paramètres régionaux facettes
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Locale-specific facets
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Facettes de conversion de code
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Code conversion facets
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codecvt_utf8 (C++11)
codecvt_utf16 (C++11)
C locale
Original:
C locale
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Defined in header <locale>
public:
int max_length() const
(1)
protected:
int do_max_length() const
(2)
1)
fonction de membre du public, appelle le do_max_length fonction membre de la classe la plus dérivée .
Original:
public member function, calls the member function do_max_length of the most derived class.
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2) returns the maximum value that do_length(state, from, from_end, 1) can return for any valid range [from, from_end) and any valid state.

Sommaire

[modifier] Retourne la valeur

The maximum number of externT characters that could be consumed if converted by do_in() to produce one internT character.

La spécialisation non-conversion std::codecvt<char, char, std::mbstate_t> retours 1
Original:
The non-converting specialization std::codecvt<char, char, std::mbstate_t> returns 1
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[modifier] Notes

If the encoding is state-dependent (encoding() == -1), then more than max_length() external characters may be consumed to produce one internal character

[modifier] Exceptions

noexcept specification:  
noexcept
   (depuis C++11)

[modifier] Exemple

#include <locale>
#include <iostream>
#include <codecvt>
int main()
{
    std::cout << "In codecvt_utf8, the longest multibyte character is "
              << std::codecvt_utf8<wchar_t>().max_length() << " bytes long\n";
 
    std::cout << "In header-consuming codecvt_utf8, the longest multibyte character is "
              << std::codecvt_utf8<wchar_t,
                                   0x10ffff,
                                   std::consume_header>().max_length() << " bytes long\n";
 
    std::cout << "In this system's en_US.utf8, the longest multibyte character is "
              << std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(
                    std::locale("en_US.utf8")
              ).max_length() << " bytes long\n";
 
    std::cout << "In this system's zh_CN.gb18030, the longest multibyte character is "
              << std::use_facet<std::codecvt<wchar_t, char, std::mbstate_t>>(
                    std::locale("zh_CN.gb18030")
              ).max_length() << " bytes long\n";
}

Résultat :

In codecvt_utf8, the longest multibyte character is 4 bytes long
In header-consuming codecvt_utf8, the longest multibyte character is 7 bytes long
In this system's en_US.utf8, the longest multibyte character is 6 bytes long
In this system's zh_CN.gb18030, the longest multibyte character is 4 bytes long

[modifier] Voir aussi

MB_CUR_MAX
nombre maximal d'octets dans un caractère multi-octets dans le courant C locale
(
variable de macro
Original:
macro variable
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)
Original:
maximum number of bytes in a multibyte character in the current C locale
(
variable de macro
Original:
macro variable
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)
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[edit]
[
virtuel
Original:
virtual
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]
retourne le nombre de caractères Externt nécessaires pour produire une Internt caractère, si constante
Original:
returns the number of externT characters necessary to produce one internT character, if constant
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(fonction membre virtuelle protégée) [edit]