// foldl.hpp
// By Tomoya Matsuura me[at]matsuuratomoya.com https://matsuuratomoya.com
// MIT License
#include <type_traits>
#include <numeric>
template<template <class...> class CONTAINER, 
         typename RES,
         typename LAMBDA>
auto foldl(CONTAINER<RES> input ,LAMBDA&& lambda){
  return std::accumulate(input.cbegin(),input.cend(),RES{},std::forward<decltype(lambda)>(lambda));
}