Скачать или смотреть Read class objects directly into a vector in C+ + without C-style arrays

Learn how to efficiently read class objects into a vector in C+ + without the need for C-style arrays. Say goodbye to unnecessary data transfers!
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Read Class Objects Directly into a Vector in C+ +

When learning to code in C+ + , working with vectors can sometimes feel overwhelming, especially if you're transitioning from a C-style programming background. One common challenge that many beginners face is managing your data efficiently, particularly when it comes to reading objects directly into STL containers like vectors. In this guide, we'll address how to read class objects directly into a vector in C+ + , avoiding the use of C-style arrays altogether.

The Problem: Inefficiency of C-style Arrays

Recently, a question arose about how to streamline the process of reading object data. The initial approach involved filling a C-style array before transferring that data to a vector, introducing unnecessary steps to an otherwise straightforward task. Here's a snippet of the original code to illustrate:

[[See Video to Reveal this Text or Code Snippet]]

As shown in the code above, we first read data into an array and then transfer that data into a vector. This process could be optimized. Let’s explore how to do that.

The Solution: Reading Directly into a Vector

Instead of utilizing a C-style array for temporary storage, we can declare the vector with the required size and read directly into the vector. Here's how we can implement that:

Step-by-Step Breakdown

Declare a Vector with the Size: When you initialize your vector, specify the desired size based on user input. This eliminates the need for an intermediate array.

Read Data into the Vector Directly: Utilize a range-based for loop to iterate over the vector and call the read() method of your class for each instance.

Example Code

Here is the revised version of the original code that implements these changes:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Code

Vector Initialization: In the line std::vector<number> people(n);, we create a vector called people with a size equal to the number of workers (n).

Reading Data: The range-based for loop iterates through the people vector, and for each instance of the number class, the read() method is called. Notice how we use a non-const reference (number& pr) which allows us to modify the objects directly.

Displaying Results: Finally, we loop through the people vector once again, this time with a const reference to print the names and calculated salaries without modifying the objects.

Conclusion

Reading class objects directly into a vector enhances efficiency and eliminates the hassle of using C-style arrays. This approach simplifies your code while maintaining clarity. Now, you can focus on developing your application without worrying about unnecessary data transfers and temporary storage.

Try incorporating this practice into your own C+ + projects and see how it streamlines your coding workflow! Happy coding!