How Can I Return a Modified Array from a C Function?

C Array Return from Function

When working with arrays in C , it's important to understand the limitations imposed by built-in arrays. In this article, we'll explore the issue of returning arrays from functions and provide alternative approaches using standard library containers.

Problem:

A user desires to read an array into a function, manipulate it within the function, and subsequently return the modified array. However, the user encounters difficulties with pointers and understanding how to approach this task effectively.

Solution:

Returning built-in arrays from functions is not supported in C . Instead, you should utilize dynamic arrays or standard library containers like vectors or boost::array.

Alternative Approaches:

1. Standard Vector:

std::vector allows you to create dynamic arrays that can grow or shrink as needed. To return an array, simply modify the vector within the function and return it:

std::vector<int> myfunction(const std::vector<int>& my_array) {
  // Modify vector
  return my_array;
}

2. Boost::array:

If you require a fixed-size array, boost::array provides this functionality. Similar to vectors, you can modify the array within the function and return it:

boost::array<int, 2> myfunction(const boost::array<int, 2>& my_array) {
  // Modify array
  return my_array;
}

Note: It's worth noting that the code provided in the original question has a bug. The array my_array is defined as having one element but is accessed with two. This is an out-of-bounds error, since arrays start at index 0 and extend to index N-1.

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