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    zaasmiZ
    @Furqan said in Here’s a step-by-step guide to upgrade PHP to version 8.2 on Ubuntu:: how to install unzip ubuntu? To install unzip on Ubuntu, follow these steps: Step 1: Update System Packages Always ensure your system packages are up to date. sudo apt update Step 2: Install unzip Install the unzip package using the following command: sudo apt install unzip -y Step 3: Verify Installation Check if unzip is installed by verifying its version: unzip -v If installed successfully, it will display the unzip version and related details. Step 4: Use unzip You can now use unzip to extract .zip files. For example: unzip filename.zip • To extract to a specific directory: unzip filename.zip -d /path/to/destination • To list the contents of a zip file without extracting: unzip -l filename.zip That’s it! You now have unzip installed and ready to use on Ubuntu.
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    cyberianC
    Here is Fixes the Problem Ensure Each Page Has a Main Landmark Each page should include a main landmark to allow users to bypass repetitive blocks of content (such as headers or navigation) and quickly reach the primary content. This is essential for improving navigation, especially for keyboard-only users. • Use landmarks to define specific sections of the layout, such as the main content area. • A page should not contain more than one main landmark to avoid confusion in navigation. HTML5 vs. ARIA In general, it’s best to use native HTML5 elements over ARIA roles whenever possible. For instance, while ARIA role role=“main” is supported by most screen readers, it’s better to use the corresponding HTML5 element for clarity and compatibility. Good Example: Using Proper Landmarks In the example below, all content is enclosed within appropriate landmarks to ensure that different sections are clearly identified. <header> <div>This is the header.</div> </header> <nav> <div>This is the navigation.</div> </nav> <main> <div>This is the main content.</div> <section> <div>This is a section.</div> </section> <article> <div>This is an article.</div> </article> <aside> <div>This is an aside.</div> </aside> </main> <footer> <div>This is the footer.</div> </footer> Why It Matters Web pages often contain repeated content such as navigation menus, ads, or headers across multiple pages. For users who rely on keyboards for navigation, this repetition can lead to frustration, as they must tab through numerous elements before reaching the main content. By ensuring proper landmarks and skip links, you: • Reduce the number of keystrokes required to navigate the page. • Help users avoid unnecessary strain and fatigue, especially those with motor limitations or disabilities that prevent mouse use. Keyboard navigation without these enhancements can be slow and physically exhausting, particularly when it involves tabbing through large numbers of elements like links and buttons in the page header. Rule Description Every page must include a main landmark to provide users with a mechanism to bypass repeated elements like headers or navigation and jump directly to the primary content. Simple Algorithm The page must have at least one of the following: • An internal skip link • A heading • A landmark region Additional Resources Here are some resources for improving accessibility: • Deque University – Subscription-based training for accessibility. • WCAG ARIA11 – Guidelines on using ARIA landmarks to mark page regions. • G1 – How to add a link at the top of each page to skip directly to the main content. • H69 – Instructions for providing heading elements at the start of each section. You can also refer to the complete list of axe 4.10 rules. By following these guidelines, you can create a more accessible and user-friendly experience for all users, especially those relying on keyboard navigation.
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    zaasmiZ
    @Engrnaveed-Saeed said in Incompatible type in filter using a callable: “I’m encountering an issue where I get an ‘Incompatible type’ error when using a callable with filter(). The callable seems to work fine on its own, but when used within filter(), it throws this error. What could be causing this issue, and how can I resolve it?” The “Incompatible type” error in filter() usually occurs when the callable you’re using doesn’t return a boolean value. The filter() function expects the callable to return True or False for each element, indicating whether that element should be included in the result. Here are a few potential causes and solutions: Callable Not Returning a Boolean Ensure that the callable you’re passing to filter() returns a boolean value (True or False). For example: # Incorrect: The function returns the value itself, not a boolean def my_callable(x): return x # Correct: The function returns a boolean condition def my_callable(x): return x > 0 result = filter(my_callable, [-2, -1, 0, 1, 2]) print(list(result)) # Output: [1, 2] Incompatible Return Type If your callable returns a non-boolean value (e.g., None, a string, or any other type), filter() will treat all non-None values as True but may still raise type errors if the value is not expected. For example: # Incorrect: Returning a string (non-boolean) def my_callable(x): return "valid" if x > 0 else "invalid" # Correct: Return boolean def my_callable(x): return x > 0 Using Lambda or Other Callables Ensure that if you’re using a lambda or other callable types, they also return booleans: # Correct usage with lambda result = filter(lambda x: x % 2 == 0, [1, 2, 3, 4, 5]) print(list(result)) # Output: [2, 4] Conclusion To resolve the “Incompatible type” error in filter(), make sure your callable function returns a boolean (True or False) based on the condition that determines whether each item should be included in the result.
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    zaasmiZ
    @zaasmi said in std::print() wrapper with altered format: Here’s a rewritten version of your question: “I’m trying to create a std::print() wrapper that modifies the output format, such as adding a prefix and suffix around the original format. I was able to achieve this using a macro. How can I improve this approach or implement it differently for more flexibility?” #define DECORATED_PRINT(fmt, ...) std::println("prefix " fmt " suffix", __VA_ARGS__) To achieve a std::print() wrapper with a modified format (e.g., adding a prefix and suffix), using a macro is one way, but there are other approaches that might offer more flexibility and better maintainability. Here are a few options: Using a Macro You can use a macro to wrap std::print() and modify the format. Here’s a simple example: #define PRINT_WITH_FORMAT(fmt, ...) std::print("[Prefix] " fmt " [Suffix]\n", ##__VA_ARGS__) While this works, macros have limitations in terms of type safety, debugging, and maintainability, especially for larger projects. Using a Function Template For more flexibility, you can create a function template that wraps std::print() and modifies the format. This way, you avoid the pitfalls of macros while still achieving the same goal: #include <format> #include <iostream> template<typename... Args> void print_with_format(const std::string& fmt, Args&&... args) { std::string formatted_message = std::format("[Prefix] " + fmt + " [Suffix]\n", std::forward<Args>(args)...); std::cout << formatted_message; } Usage: print_with_format("Hello, {}!", "World"); Custom Formatter (Advanced) If you want more control over the formatting process, you can create a custom formatter by extending std::formatter: #include <format> #include <iostream> template <> struct std::formatter<std::string> { constexpr auto parse(auto& ctx) { return ctx.begin(); } auto format(const std::string& s, auto& ctx) { return std::format_to(ctx.out(), "[Prefix] {} [Suffix]", s); } }; void print_with_format(const std::string& message) { std::cout << std::format("{}", message) << '\n'; } This approach gives you deep customization over how different types are formatted. Conclusion • Macros are quick and simple but have limitations in flexibility and maintainability. • Function templates offer a more modern, type-safe, and maintainable solution. • Custom formatters provide advanced control and customization, especially for complex formatting needs. For most use cases, the function template approach strikes a good balance between flexibility and simplicity.
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