numeris_romanis.hpp is a single-header C++17 library for dealing with roman numerals.

Features

• Literal operators so you too can embed film copyright dates in your source code!
• Seamless interoperability with numeris arabicis!
• Type safety!
• Compile-time operations!
• Conversion to and from strings!
• Output streaming!
• Really, really bad Latin! *

Examples

using namespace rom::literals_numerorum;
static_assert("MCMLXXXVIII"_r + "XII"_r == "MM"_r);

void foo()
{
    std::cout << rom::numerus{742} << '\n'; // prints DCCXLII
}

void bar()
{
    const rom::numerus r{444};
    std::string str = r.ad_filum();
    assert(str == "CDXLIV");
}

Acknowledgements

Inspired by Tim Sweeney on Twitter:

Breaking: Roman numeral constant support proposed for C++0rMMXXIII.

— Tim Sweeney (@TimSweeneyEpic) October 4, 2018

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*: All translations provided by Google Translate. Please don't make me write it out a hundred times.