enumerate

C++11 single header library that adds support for enumerating items in a for-range loop.

Examples

Enumerating vector's contents from 0 with step = 1 (default)

std::vector<int> items{ 11, 22, 33, 44 };
for (auto& i : helpers::enumerate(items)) {
    std::cout << i.count << ": " << i.value << "\n";
}

Output:

0: 11
1: 22
2: 33
3: 44

Iterating backwards and counting down from items.size() with step = -1

for (auto& i : helpers::enumerate(items.rbegin(), items.rend(), items.size(), -1)) {
    std::cout << i.count << ": " << i.value << "\n";
}

Output:

4: 44
3: 33
2: 22
1: 11

Enumerating contents of std::initializer_list with structural binding (C++17)

for (auto& [count, value] : helpers::enumerate({ "oh my", "them", "char pointers!" })) {
    std::cout << count << ": " << value << "\n";
}

Output:

0: oh my
1: them
2: char pointers!

Supported containers

All that can be used in a for-range loop.

How to use

• Copy the enumerate.h file into your project.
• Optionally rename the default outer namespace (helpers) as you see fit.
• Enjoy!

License

Public domain (The Unlicense). See LICENSE file for details.