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This is indented 9 places So is this But this is indented 18 places Enter some characters: 000abc Leading zeros are skipped Contents of str: abc Use indent with a string stream Contents of ostrstrm: 128
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This recipe shows an easy way to create parameterized manipulators, but it is not the only way In the header <iomanip> are defined the parameterized manipulators specified by Standard C++ If you examine this header, you will probably see a more sophisticated approach, which utilizes templates and possibly complex macros You could use the approach shown in that header to create your own parameterized manipulators that integrate with the class types defined by that header However, because the classes in <iomanip> are implementation-specific, they may (probably will) differ between compilers The approach used by the recipe is portable Also, typically, the mechanism used by <iomanip> is fairly complicated and can be difficult to understand without significant study Often, it is simply easier to use the technique shown in this recipe Frankly, it is the approach that I like
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Headers <ios> <ios> <locale> Classes ios_base ios locale Functions locale getloc( ) const locale imbue(const locale &newloc) string name( ) const
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You can obtain or set the locale object associated with a stream In C++, locale-specific information is encapsulated within a locale object This object defines various locale-related items, such as the currency symbol, the thousands separator, and so on Each stream has a locale associated with it To aid in internationalization, you may want to obtain a stream's locale object or set it to a new one This recipe shows the process
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Step-by-Step
To obtain the current locale object associated with a stream involves these steps: 1 Create a locale instance that will receive a copy of the current locale 2 Call getloc( ) on the stream to obtain a copy of the current locale To set the locale associated with a stream involves these steps: 1 Create a locale instance that encapsulates the desired locale 2 Call imbue( ) on the stream, passing in the locale object from Step 1
Discussion
The locale class encapsulates geopolitical information about a program's execution environment For example, a program's locale determines the currency symbol, the time format, and the date format, among many others The locale class requires the header <locale> Each stream has a locale object associated with it To obtain a stream's current locale, call getloc( ) on the stream It is shown here: locale getloc( ) const It returns the locale object associated with the stream To set a stream's locale, call imbue( ) on the stream It is shown here: locale imbue(const locale &newloc) The invoking stream's locale is set to newloc, and the old locale is returned An easy way to construct a locale instance is to use this locale constructor: explicit locale(const char *name) Here, name specifies the name of the locale, such as german, spanish_spain, or US If name does not represent a valid locale, then a runtime_error exception is thrown Given a locale instance, you can obtain its name by calling name( ) It is shown here: string name( ) const The human-readable name of the locale is returned
Example
The following example shows how to obtain and set a stream's locale It first displays the stream's current locale, which is typically the C locale (which is usually the default locale for a C++ program) It then sets the locale to German_Germany Finally, it obtains and displays the money symbol and the character used for the thousands separator
// Demonstrate getloc() and imbue() on a stream #include <iostream> #include <fstream> #include <locale>
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