RWLocaleSnapshot(3C++) RWLocaleSnapshot(3C++)
NameRWLocaleSnapshot - Rogue Wave library class
Synopsis
#include <locale.h>
#include <rw/locale.h>
RWLocaleSnapshot ourLocale(""); // encapsulate user's formats
Description
The class RWLocaleSnapshot implements the RWLocale interface using
Standard C library facilities. To use it, the program creates an
RWLocaleSnapshot instance. The constructor of the instance queries the
program's environment (using standard C library functions such as
localeconv(), strftime(), and, if available , vendor specific library
functions) to learn everything it can about formatting conventions in
effect at the moment of instantiation. When done, the locale can then be
switched and another instance of RWLocaleSnapshot created. By creating
multiple instances of RWLocaleSnapshot, your program can have more than
one locale active at the same time, something that is difficult to do
with the Standard C library facilities. Note: RWLocaleSnapshot does not
encapsulate character set, collation, or message information. Class
RWLocaleSnapshot has a set of public data members initialized by its
constructor with information extracted from its execution environment.
Persistence
None
Example
Try this program with the environmental variable LANG set to various
locales:
#include <rw/rwdate.h>
#include <rw/locale.h>
#include <iostream.h>
main(){
RWLocaleSnapshot *userLocale = new RWLocaleSnapshot("");
RWLocale::global(userLocale);
// Print a number using the global locale:
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RWLocaleSnapshot(3C++) RWLocaleSnapshot(3C++)
cout << RWLocale::global().asString(1234567.6543) << endl;
// Now get and print a date:
cout << "enter a date: " << flush;
RWDate date;
cin >> date;
if (date.isValid())
cout << date << endl;
else
cout << "bad date" << endl;
delete userLocale;
return 0;
}
Enumerations
enum
RWDateOrder { DMY, MDY, YDM, YMD };
Public Constructor
RWLocaleSnapshot(const char* localeName = 0);
Constructs an RWLocale object by extracting formats from the global
locale environment. It uses the Standard C Library function setlocale()
to set the named locale, and then restores the previous global locale
after formats have been extracted. If localeName is 0, it simply uses
the current locale. The most useful locale name is the empty string, "",
which is a synonym for the user's chosen locale (usually specified by the
environment variable LANG).
Public Member Functions
virtual RWCString
asString(long) const;
virtual RWCString
asString(unsigned long) const;
virtual RWCString
asString(double f, int precision = 6,
RWBoolean showpoint = 0) const;
virtual RWCString
asString(struct tm* tmbuf,char format, const RWZone& zone);
const;
virtual RWCString
asString(struct tm* tmbuf,char* format,
const RWZone& zone) const;
virtual RWCString
moneyAsString(double value,enum CurrSymbol = LOCAL) const;
virtual RWBoolean
stringToNum (const RWCString&, double* fp) const;
virtual RWBoolean
stringToNum (const RWCString&, long* ip ) const;
virtual RWBoolean
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RWLocaleSnapshot(3C++) RWLocaleSnapshot(3C++)
stringToDate (const RWCString&, struct tm*) const;
virtual RWBoolean
stringToTime (const RWCString&, struct tm*) const;
virtual RWBoolean
stringToMoney(const RWCString&, double* ,
RWLocale::CurrSymbol=LOCAL) const;
Redefined from class RWLocale. These virtual functions follow the
interface described under class RWLocale. They generally work by
converting values to and from strings using the rules specified by the
struct lconv values (see <locale.h>) encapsulated in self.
Public Data Members
RWCString decimal_point_;
RWCString thousands_sep_;
RWCString grouping_;
RWCString int_curr_symbol_;
RWCString currency_symbol_;
RWCString mon_decimal_point_;
RWCString mon_thousands_sep_;
RWCString mon_grouping_;
RWCString positive_sign_;
RWCString negative_sign_;
char int_frac_digits_;
char frac_digits_;
char p_cs_precedes_;
char p_sep_by_space_;
char n_cs_precedes_;
char n_sep_by_space_;
char p_sign_posn_;
char n_sign_posn_;
These are defined identically as the correspondingly-named members of the
standard C library type lconv, from <locale.h>.
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