Casting.h

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#pragma once
#include "catapult/exceptions.h"
#include <limits>
#include <stdexcept>
#include <type_traits>
 
namespace catapult { namespace utils {
 
    template<typename T>
    constexpr const T& as_const(T& ref) {
        return ref;
    }
 
    template<typename TEnum>
    constexpr std::underlying_type_t<TEnum> to_underlying_type(TEnum value) {
        return static_cast<std::underlying_type_t<TEnum>>(value);
    }
 
    template<typename TSource, typename TDest>
    TDest checked_cast(TSource value) {
        using dest_limits = std::numeric_limits<TDest>;
        using source_limits = std::numeric_limits<TSource>;
        static_assert(
            source_limits::min() < dest_limits::min() || source_limits::max() > dest_limits::max(),
            "checked_cast can only be used when data truncation is possible");
 
        if (value < dest_limits::min() || value > dest_limits::max())
            CATAPULT_THROW_RUNTIME_ERROR_1("checked_cast detected data truncation", value);
 
        return static_cast<TDest>(value);
    }
}}