How Can I Restore the Original State of std::cout After Modifying Its Formatting?

Restoring the State of std::cout After Manipulation

In C , streams such as std::cout can be manipulated to alter their formatting and behavior. However, after such manipulations, restoring the stream's original state may be necessary.

Suppose you have the following code:

void printHex(std::ostream& x) {
    x <p>After calling printHex(), the state of std::cout has been altered to print integers in hexadecimal format. This causes a subsequent call to std::cout in the main function to also print in hex, potentially causing unexpected behavior.</p><p>To restore the original state of std::cout, we can use stream flags:</p><pre class="brush:php;toolbar:false">#include <iostream>

int main() {
    std::ios_base::fmtflags f(cout.flags());

    printHex(std::cout);

    cout.flags(f); // Restore original flags

    std::cout <p>In this example, the fmtflags object f stores the original stream flags of std::cout. After calling printHex(), we explicitly set the stream flags back to f's value using cout.flags(f). This ensures that std::cout's state is restored to its original settings.</p>
<p>By utilizing stream flags and restoring them appropriately, we can manipulate streams while maintaining control over their formatting behavior, avoiding unintended consequences like incorrect number formats in this case.</p></iostream>

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