Functional.h

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#pragma once
#include <type_traits>
 
namespace catapult { namespace utils {
 
    template<typename TContainer, typename TInitial, typename TFunction>
    auto Reduce(const TContainer& container, TInitial initialValue, TFunction fun) {
        for (const auto& element : container)
            initialValue = fun(initialValue, element);
 
        return initialValue;
    }
 
    template<typename TContainer, typename TFunction>
    auto Sum(const TContainer& container, TFunction accessor) {
        std::invoke_result_t<TFunction, typename TContainer::value_type> sum = 0;
 
        for (const auto& element : container)
            sum += accessor(element);
 
        return sum;
    }
}}