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C++ IOS::imbue() function

The C++ std::ios::imbue() function is used to set or change the locale for input and output streams. It is used to customize the formatting of data by changing the locale associated with the stream. It allows you to handle the locale-specific requirements like number formatting, date and time representation.It takes the std::locale object as its parameter and returns the previous locale of the stream.

Following is the syntax for std::ios::imbue() function.

locale imbue (const locale& loc);

• loc − It indicates the locale object to be imbued as the new locale for the stream.

The locale object associated with the stream before the call.

If an exception is thrown, the stream is in a valid state.

Modifies the stream object.

Concurrent access to the same stream object may cause data races.

In the following example, we are going to consider the basic usage of the imbue() function.

#include <iostream>
#include <locale>
int main()
{
    std::cout.imbue(std::locale());
    std::cout << "Current Locale : " << std::cout.getloc().name() << std::endl;
    return 0;
}

Output of the above code is as follows −

Current Locale : C

Consider the following example, where we are going to use the US English locale, which formats numbers with commas as thousand separators.

#include <iostream>
#include <locale>
int main()
{
    std::locale a("en_US.utf8");
    std::cout.imbue(a);
    std::cout << 1122343.89 << std::endl;
    return 0;
}

Following is the output of the above code −

1,122,343.89

Let's look at the following example, where we are going to use the US English to print a monetary value in the appropriate format.

#include <iostream>
#include <locale>
#include <iomanip>
int main()
{
    std::locale a("en_US.utf8");
    std::cout.imbue(a);
    std::cout << std::showbase << std::put_money(123431232) << std::endl;
    return 0;
}

If we run the above code it will generate the following output −

$1,234,312.32

ios.htm

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