How do I metaprogram with std::integer_sequence and std::index_sequence?

Metaprogramming in C++ can be greatly enhanced using features like std::integer_sequence and std::index_sequence. These utilities allow you to generate sequences of integers at compile time, making it easier to work with variadic templates and implement complex template logic.

Example of std::integer_sequence

#include <iostream> #include <utility> template<std::size_t... Is> void printIndices(std::index_sequence<Is...>) { // Expands to print each index in the sequence ((std::cout << Is << " "), ...); } int main() { printIndices(std::index_sequence<0, 1, 2, 3, 4>{}); return 0; }

Example of std::index_sequence

#include <iostream> #include <utility> // A function that calls another function with a sequence of indices template<typename F, std::size_t... Is> void callWithIndexSequence(F func, std::index_sequence<Is...>) { func(Is...); } void myFunction(int a, int b, int c) { std::cout << "Values: " << a <<", " << b <<", " << c << std::endl; } int main() { callWithIndexSequence(myFunction, std::index_sequence<0, 1, 2>{}); return 0; }

std::integer_sequence std::index_sequence C++ metaprogramming compile-time programming

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