# <tuple>

**[<tuple>](https://en.cppreference.com/w/cpp/header/tuple)** provides `std::tuple<T1, T2, ...>`, a heterogeneous fixed-size container holding values of different types. Use `std::get<I>(t)` to access by index or `std::get<T>(t)` to access by type. C++17 structured bindings (`auto [x, y] = tuple`) make tuples convenient.

Tuples are useful for returning multiple values from a function without defining a struct.

## Example

This example returns multiple values of different types from a function via tuple, using structured bindings to unpack them.

```cpp
// compile: g++ -std=c++17 -o tupleexample tupleexample.cpp
// run: ./tupleexample
// description: tuple creation and unpacking

#include <tuple>
#include <iostream>
#include <string>

std::tuple<int, double, std::string> fetch_data() {
    return {42, 3.14, "hello"};
}

int main() {
    auto [i, d, s] = fetch_data();
    std::cout << "int: " << i << ", double: " << d << ", string: " << s << "\n";
    
    return 0;
}
```