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C++ IOS::widen() function

The C++ std::ios::widen() function is used to convert a character to its wide character equivalent in the streams associated locale. It is mainly used when working with internationalization, where characters may need to be represented in a wide format for proper handling.

widen() is a member function of the std::ios_base class used in conjunction with input/output operations.

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

char widen (char c) const;

• c − It indicates the character to be widened.

It returns the wide equivalent of c.

If an exception is thrown, there are no changes in the stream.

Accesses 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 widen() function.

#include <iostream>
#include <locale>
int main()
{
    std::cout << std::cout.widen('A') << std::endl;
    return 0;
}

Output of the above code is as follows −

A

Consider the following example, where we are going to convert a string to wide character.

#include <iostream>
#include <locale>
#include <string>
#include <vector>
int main()
{
    std::ios a(nullptr);
    std::string b = "TutorialsPoint";
    std::vector<wchar_t> x;
    for (char c : b) {
        x.push_back(a.widen(c));
    }
    for (wchar_t wc : x) {
        std::wcout << wc << " ";
    }
    return 0;
}

Following is the output of the above code −

T u t o r i a l s P o i n t

ios.htm

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