Как определить индекс элемента в range-based for цикле?

int arr[3] = { 9, 7, 1 };
for (auto i: arr) std::cout << "i" << "\n";

int arr[3] = { 9, 7, 1 };
for (auto i: arr) std::cout << i << "\n";

#include <iostream>
#include <iterator>
 
int main()
{
    int arr[] = { 9, 7, 1 };
    for ( const auto & i : arr )
        std::cout << "array[" << &i - &(*std::begin(arr)) << "] =  " << i << "\n";
}

#include <iostream>
 
int main()
{
    int arr[] = { 15, 22, 37, 48, 50, 60, 79 };
    for ( const auto & i : arr )
        std::cout << "array[" << &i - &*arr << "] =  " << i << "\n";
}

std::vector<VkExtensionProperties> extensions(extensionCount);
vkEnumerateInstanceExtensionProperties(nullptr, &extensionCount, extensions.data());
std::cout << "\n" << "Полное число доступных расширений Вулкана: " << extensionCount << "\n\n";
for (const auto& extension : extensions) 
  std::cout << "  Доступное расширение Вулкана: " << extension.extensionName << "\n";

typedef struct VkExtensionProperties {
    char        extensionName[VK_MAX_EXTENSION_NAME_SIZE];
    uint32_t    specVersion;
} VkExtensionProperties;

int arr[3] = { 9, 7, 1 };
int n = 0;
for (auto i: arr) {
  std::cout << "Массив [" << n << "] =" << i << "\n";
  n++;
}

#include <iostream>
#include <vector>
#include <string>
 
struct VkExtensionProperties
{
    std::string extensionName;
    size_t specVersion;
};
 
int main()
{
    const size_t extensionCount = 4;
 
    std::vector<VkExtensionProperties> extensions(extensionCount);
 
    for (auto& elem : extensions)
    {
        std::cout << "Enter extension name: ";
        std::cin >> elem.extensionName;
        std::cout << "Enter spec version: ";
        std::cin >> elem.specVersion;
        std::cout << "\n";
    }
 
    for (const auto& elem : extensions)
      std::cout << "  Available Vulcan extension: " << elem.extensionName << "\n";
 
}

for (auto i: arr)

for( auto it = arr.begin(); it !=arr.end(); it++ )

#include <iostream>
#include <vector>
#include <string>
#include <iterator>
 
struct VkExtensionProperties
{
    std::string extensionName;
    size_t specVersion;
};
 
int main()
{
    const size_t extensionCount = 4;
 
    std::vector<VkExtensionProperties> extensions( extensionCount );
 
    for ( auto& elem : extensions )
    {
        std::cout << "Enter extension name: ";
        std::cin >> elem.extensionName;
        std::cout << "Enter spec version: ";
        std::cin >> elem.specVersion;
        std::cout << "\n";
    }
 
    for ( const auto& elem : extensions )
        std::cout
            << "Available Vulcan extension: "
            << "array["
            << &elem - &( *std::begin( extensions ) )
            << "] =  "
            << elem.extensionName
            << "\n";
 
}

&elem - &( *std::begin( extensions ) )

for( auto i = 0; i < arr.size(); i++)