Click on the banner to return to the Class Reference home page.

©Copyright 1996 Rogue Wave Software

RWLocaleSnapshot

RWLocaleSnapshotRWLocale

• Synopsis
• Description
• Persistence
• Example
• Enumerations
• Public Constructor
• Public Member Functions
• Public Data Members

#include <locale.h>

#include <rw/locale.h>

RWLocaleSnapshot ourLocale("");  // encapsulate user's formats

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.

None

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:
 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;
}

enum 
RWDateOrder { DMY, MDY, YDM, YMD };

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).

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
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.

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>.