ForEachWithIndex.hpp

 
// This work derives from Vittorio Romeo's code used for cppcon 2015 licensed
// under the Academic Free License.
// His code is available here: https://github.com/SuperV1234/cppcon2015
 
 
#ifndef EC_META_FOR_EACH_WITH_INDEX_HPP
#define EC_META_FOR_EACH_WITH_INDEX_HPP
 
#include <tuple>
#include <utility>
#include "Morph.hpp"
 
namespace EC
{
    namespace Meta
    {
        template <typename Function, typename TTuple, std::size_t... Indices>
        constexpr void forEachWithIndexHelper(
            Function&& function, TTuple tuple, std::index_sequence<Indices...>)
        {
            return (void)std::initializer_list<int>{(function(std::move(
                std::get<Indices>(tuple)), Indices), 0)...};
        }
 
        template <typename TTypeList, typename Function>
        constexpr void forEachWithIndex(Function&& function)
        {
            using TTuple = EC::Meta::Morph<TTypeList, std::tuple<> >;
            using TTupleSize = std::tuple_size<TTuple>;
            using IndexSeq = std::make_index_sequence<TTupleSize::value>;
 
            return forEachWithIndexHelper(
                std::forward<Function>(function), TTuple{}, IndexSeq{});
        }
    }
}
 
#endif