在 C++ 中使用带有智能指针的 memcpy

Question

I have a smart pointer defined like this

     auto ptr = make_shared<int[]>(5);

and another array

    int arr[] = {1,2,3,4,5};

I want to copy data in arr to ptr, I tried using this

    memcpy(ptr.get(), arr, 5 * sizeof(int))

But when I try printing like this

    for (int i = 0; i < 5; i++) {
        std::cout<<ptr[i]<<std::endl;
    }

I get

malloc(): corrupted top size

Process finished with exit code 134
(interrupted by signal 6: SIGABRT)

Is there something wrong with the ptr initialization?

Answer 1

Here is an example of what you need (hope so):

#include <iostream>
#include <memory>
#include <cstring>

int main() {
    // Create a unique_ptr to an int array
    std::unique_ptr<int[]> arr1(new int[5]{ 1, 2, 3, 4, 5 });

    // Create a unique_ptr to an int array
    std::unique_ptr<int[]> arr2(new int[5]);

    // Use memcpy to copy the data from arr1 to arr2
    std::memcpy(arr2.get(), arr1.get(), 5 * sizeof(int));

    // Print the contents of arr2
    for (int i = 0; i < 5; i++) {
        std::cout << arr2[i] << " ";
    }
    std::cout << std::endl;

    return 0;
}