text: ////
  // https://github.com/microsoft/terminal/blob/734fc1dcc6de4315d4cc91944c5ea83b7b8a7e1a/src/types/CodepointWidthDetector.cpp
  #include <iterator>
  #include <algorithm>
  #include <array>
  
  namespace unicode {
  enum class CodepointWidth : uint8_t {
    Narrow,
    Wide,
    Ambiguous, // could be narrow or wide depending on the current codepage and
               // font
    Invalid    // not a valid unicode codepoint
  };
  
  // used to store range data in CodepointWidthDetector's internal map
  struct UnicodeRange final {
    unsigned int lowerBound;
    unsigned int upperBound;
    CodepointWidth width;
  };
  
  static bool operator<(const UnicodeRange &range, const unsigned int searchTerm) {
    return range.upperBound < searchTerm;
  }
  
  static constexpr std::array<UnicodeRange, 285> s_wideAndAmbiguousTable{
      // generated from
      // http://www.unicode.org/Public/UCD/latest/ucd/EastAsianWidth.txt
      // anything not present here is presumed to be Narrow.
      UnicodeRange{0xa1, 0xa1, CodepointWidth::Ambiguous},
      UnicodeRange{0xa4, 0xa4, CodepointWidth::Ambiguous},
      UnicodeRange{0xa7, 0xa8, CodepointWidth::Ambiguous},
      UnicodeRange{0xaa, 0xaa, CodepointWidth::Ambiguous},
      UnicodeRange{0xad, 0xae, CodepointWidth::Ambiguous},
      UnicodeRange{0xb0, 0xb4, CodepointWidth::Ambiguous},
      UnicodeRange{0xb6, 0xba, CodepointWidth::Ambiguous},
      UnicodeRange{0xbc, 0xbf, CodepointWidth::Ambiguous},
      UnicodeRange{0xc6, 0xc6, CodepointWidth::Ambiguous},
      UnicodeRange{0xd0, 0xd0, CodepointWidth::Ambiguous},
      UnicodeRange{0xd7, 0xd8, CodepointWidth::Ambiguous},
      UnicodeRange{0xde, 0xe1, CodepointWidth::Ambiguous},
      UnicodeRange{0xe6, 0xe6, CodepointWidth::Ambiguous},
      UnicodeRange{0xe8, 0xea, CodepointWidth::Ambiguous},
      UnicodeRange{0xec, 0xed, CodepointWidth::Ambiguous},
      UnicodeRange{0xf0, 0xf0, CodepointWidth::Ambiguous},
      UnicodeRange{0xf2, 0xf3, CodepointWidth::Ambiguous},
      UnicodeRange{0xf7, 0xfa, CodepointWidth::Ambiguous},
      UnicodeRange{0xfc, 0xfc, CodepointWidth::Ambiguous},
      UnicodeRange{0xfe, 0xfe, CodepointWidth::Ambiguous},
      UnicodeRange{0x101, 0x101, CodepointWidth::Ambiguous},
      UnicodeRange{0x111, 0x111, CodepointWidth::Ambiguous},
      UnicodeRange{0x113, 0x113, CodepointWidth::Ambiguous},
      UnicodeRange{0x11b, 0x11b, CodepointWidth::Ambiguous},
      UnicodeRange{0x126, 0x127, CodepointWidth::Ambiguous},
      UnicodeRange{0x12b, 0x12b, CodepointWidth::Ambiguous},
      UnicodeRange{0x131, 0x133, CodepointWidth::Ambiguous},
      UnicodeRange{0x138, 0x138, CodepointWidth::Ambiguous},
      UnicodeRange{0x13f, 0x142, CodepointWidth::Ambiguous},
      UnicodeRange{0x144, 0x144, CodepointWidth::Ambiguous},
      UnicodeRange{0x148, 0x14b, CodepointWidth::Ambiguous},
      UnicodeRange{0x14d, 0x14d, CodepointWidth::Ambiguous},
      UnicodeRange{0x152, 0x153, CodepointWidth::Ambiguous},
      UnicodeRange{0x166, 0x167, CodepointWidth::Ambiguous},
      UnicodeRange{0x16b, 0x16b, CodepointWidth::Ambiguous},
      UnicodeRange{0x1ce, 0x1ce, CodepointWidth::Ambiguous},
      UnicodeRange{0x1d0, 0x1d0, CodepointWidth::Ambiguous},
      UnicodeRange{0x1d2, 0x1d2, CodepointWidth::Ambiguous},
      UnicodeRange{0x1d4, 0x1d4, CodepointWidth::Ambiguous},
      UnicodeRange{0x1d6, 0x1d6, CodepointWidth::Ambiguous},
      UnicodeRange{0x1d8, 0x1d8, CodepointWidth::Ambiguous},
      UnicodeRange{0x1da, 0x1da, CodepointWidth::Ambiguous},
      UnicodeRange{0x1dc, 0x1dc, CodepointWidth::Ambiguous},
      UnicodeRange{0x251, 0x251, CodepointWidth::Ambiguous},
      UnicodeRange{0x261, 0x261, CodepointWidth::Ambiguous},
      UnicodeRange{0x2c4, 0x2c4, CodepointWidth::Ambiguous},
      UnicodeRange{0x2c7, 0x2c7, CodepointWidth::Ambiguous},
      UnicodeRange{0x2c9, 0x2cb, CodepointWidth::Ambiguous},
      UnicodeRange{0x2cd, 0x2cd, CodepointWidth::Ambiguous},
      UnicodeRange{0x2d0, 0x2d0, CodepointWidth::Ambiguous},
      UnicodeRange{0x2d8, 0x2db, CodepointWidth::Ambiguous},
      UnicodeRange{0x2dd, 0x2dd, CodepointWidth::Ambiguous},
      UnicodeRange{0x2df, 0x2df, CodepointWidth::Ambiguous},
      UnicodeRange{0x300, 0x36f, CodepointWidth::Ambiguous},
      UnicodeRange{0x391, 0x3a1, CodepointWidth::Ambiguous},
      UnicodeRange{0x3a3, 0x3a9, CodepointWidth::Ambiguous},
      UnicodeRange{0x3b1, 0x3c1, CodepointWidth::Ambiguous},
      UnicodeRange{0x3c3, 0x3c9, CodepointWidth::Ambiguous},
      UnicodeRange{0x401, 0x401, CodepointWidth::Ambiguous},
      UnicodeRange{0x410, 0x44f, CodepointWidth::Ambiguous},
      UnicodeRange{0x451, 0x451, CodepointWidth::Ambiguous},
      UnicodeRange{0x1100, 0x115f, CodepointWidth::Wide},
      UnicodeRange{0x2010, 0x2010, CodepointWidth::Ambiguous},
      UnicodeRange{0x2013, 0x2016, CodepointWidth::Ambiguous},
      UnicodeRange{0x2018, 0x2019, CodepointWidth::Ambiguous},
      UnicodeRange{0x201c, 0x201d, CodepointWidth::Ambiguous},
      UnicodeRange{0x2020, 0x2022, CodepointWidth::Ambiguous},
      UnicodeRange{0x2024, 0x2027, CodepointWidth::Ambiguous},
      UnicodeRange{0x2030, 0x2030, CodepointWidth::Ambiguous},
      UnicodeRange{0x2032, 0x2033, CodepointWidth::Ambiguous},
      UnicodeRange{0x2035, 0x2035, CodepointWidth::Ambiguous},
      UnicodeRange{0x203b, 0x203b, CodepointWidth::Ambiguous},
      UnicodeRange{0x203e, 0x203e, CodepointWidth::Ambiguous},
      UnicodeRange{0x2074, 0x2074, CodepointWidth::Ambiguous},
      UnicodeRange{0x207f, 0x207f, CodepointWidth::Ambiguous},
      UnicodeRange{0x2081, 0x2084, CodepointWidth::Ambiguous},
      UnicodeRange{0x20ac, 0x20ac, CodepointWidth::Ambiguous},
      UnicodeRange{0x2103, 0x2103, CodepointWidth::Ambiguous},
      UnicodeRange{0x2105, 0x2105, CodepointWidth::Ambiguous},
      UnicodeRange{0x2109, 0x2109, CodepointWidth::Ambiguous},
      UnicodeRange{0x2113, 0x2113, CodepointWidth::Ambiguous},
      UnicodeRange{0x2116, 0x2116, CodepointWidth::Ambiguous},
      UnicodeRange{0x2121, 0x2122, CodepointWidth::Ambiguous},
      UnicodeRange{0x2126, 0x2126, CodepointWidth::Ambiguous},
      UnicodeRange{0x212b, 0x212b, CodepointWidth::Ambiguous},
      UnicodeRange{0x2153, 0x2154, CodepointWidth::Ambiguous},
      UnicodeRange{0x215b, 0x215e, CodepointWidth::Ambiguous},
      UnicodeRange{0x2160, 0x216b, CodepointWidth::Ambiguous},
      UnicodeRange{0x2170, 0x2179, CodepointWidth::Ambiguous},
      UnicodeRange{0x2189, 0x2189, CodepointWidth::Ambiguous},
      UnicodeRange{0x2190, 0x2199, CodepointWidth::Ambiguous},
      UnicodeRange{0x21b8, 0x21b9, CodepointWidth::Ambiguous},
      UnicodeRange{0x21d2, 0x21d2, CodepointWidth::Ambiguous},
      UnicodeRange{0x21d4, 0x21d4, CodepointWidth::Ambiguous},
      UnicodeRange{0x21e7, 0x21e7, CodepointWidth::Ambiguous},
      UnicodeRange{0x2200, 0x2200, CodepointWidth::Ambiguous},
      UnicodeRange{0x2202, 0x2203, CodepointWidth::Ambiguous},
      UnicodeRange{0x2207, 0x2208, CodepointWidth::Ambiguous},
      UnicodeRange{0x220b, 0x220b, CodepointWidth::Ambiguous},
      UnicodeRange{0x220f, 0x220f, CodepointWidth::Ambiguous},
      UnicodeRange{0x2211, 0x2211, CodepointWidth::Ambiguous},
      UnicodeRange{0x2215, 0x2215, CodepointWidth::Ambiguous},
      UnicodeRange{0x221a, 0x221a, CodepointWidth::Ambiguous},
      UnicodeRange{0x221d, 0x2220, CodepointWidth::Ambiguous},
      UnicodeRange{0x2223, 0x2223, CodepointWidth::Ambiguous},
      UnicodeRange{0x2225, 0x2225, CodepointWidth::Ambiguous},
      UnicodeRange{0x2227, 0x222c, CodepointWidth::Ambiguous},
      UnicodeRange{0x222e, 0x222e, CodepointWidth::Ambiguous},
      UnicodeRange{0x2234, 0x2237, CodepointWidth::Ambiguous},
      UnicodeRange{0x223c, 0x223d, CodepointWidth::Ambiguous},
      UnicodeRange{0x2248, 0x2248, CodepointWidth::Ambiguous},
      UnicodeRange{0x224c, 0x224c, CodepointWidth::Ambiguous},
      UnicodeRange{0x2252, 0x2252, CodepointWidth::Ambiguous},
      UnicodeRange{0x2260, 0x2261, CodepointWidth::Ambiguous},
      UnicodeRange{0x2264, 0x2267, CodepointWidth::Ambiguous},
      UnicodeRange{0x226a, 0x226b, CodepointWidth::Ambiguous},
      UnicodeRange{0x226e, 0x226f, CodepointWidth::Ambiguous},
      UnicodeRange{0x2282, 0x2283, CodepointWidth::Ambiguous},
      UnicodeRange{0x2286, 0x2287, CodepointWidth::Ambiguous},
      UnicodeRange{0x2295, 0x2295, CodepointWidth::Ambiguous},
      UnicodeRange{0x2299, 0x2299, CodepointWidth::Ambiguous},
      UnicodeRange{0x22a5, 0x22a5, CodepointWidth::Ambiguous},
      UnicodeRange{0x22bf, 0x22bf, CodepointWidth::Ambiguous},
      UnicodeRange{0x2312, 0x2312, CodepointWidth::Ambiguous},
      UnicodeRange{0x231a, 0x231b, CodepointWidth::Wide},
      UnicodeRange{0x2329, 0x232a, CodepointWidth::Wide},
      UnicodeRange{0x23e9, 0x23ec, CodepointWidth::Wide},
      UnicodeRange{0x23f0, 0x23f0, CodepointWidth::Wide},
      UnicodeRange{0x23f3, 0x23f3, CodepointWidth::Wide},
      UnicodeRange{0x2460, 0x24e9, CodepointWidth::Ambiguous},
      UnicodeRange{0x24eb, 0x254b, CodepointWidth::Ambiguous},
      UnicodeRange{0x2550, 0x2573, CodepointWidth::Ambiguous},
      UnicodeRange{0x2580, 0x258f, CodepointWidth::Ambiguous},
      UnicodeRange{0x2592, 0x2595, CodepointWidth::Ambiguous},
      UnicodeRange{0x25a0, 0x25a1, CodepointWidth::Ambiguous},
      UnicodeRange{0x25a3, 0x25a9, CodepointWidth::Ambiguous},
      UnicodeRange{0x25b2, 0x25b3, CodepointWidth::Ambiguous},
      UnicodeRange{0x25b6, 0x25b7, CodepointWidth::Ambiguous},
      UnicodeRange{0x25bc, 0x25bd, CodepointWidth::Ambiguous},
      UnicodeRange{0x25c0, 0x25c1, CodepointWidth::Ambiguous},
      UnicodeRange{0x25c6, 0x25c8, CodepointWidth::Ambiguous},
      UnicodeRange{0x25cb, 0x25cb, CodepointWidth::Ambiguous},
      UnicodeRange{0x25ce, 0x25d1, CodepointWidth::Ambiguous},
      UnicodeRange{0x25e2, 0x25e5, CodepointWidth::Ambiguous},
      UnicodeRange{0x25ef, 0x25ef, CodepointWidth::Ambiguous},
      UnicodeRange{0x25fd, 0x25fe, CodepointWidth::Wide},
      UnicodeRange{0x2605, 0x2606, CodepointWidth::Ambiguous},
      UnicodeRange{0x2609, 0x2609, CodepointWidth::Ambiguous},
      UnicodeRange{0x260e, 0x260f, CodepointWidth::Ambiguous},
      UnicodeRange{0x2614, 0x2615, CodepointWidth::Wide},
      UnicodeRange{0x261c, 0x261c, CodepointWidth::Ambiguous},
      UnicodeRange{0x261e, 0x261e, CodepointWidth::Ambiguous},
      UnicodeRange{0x2640, 0x2640, CodepointWidth::Ambiguous},
      UnicodeRange{0x2642, 0x2642, CodepointWidth::Ambiguous},
      UnicodeRange{0x2648, 0x2653, CodepointWidth::Wide},
      UnicodeRange{0x2660, 0x2661, CodepointWidth::Ambiguous},
      UnicodeRange{0x2663, 0x2665, CodepointWidth::Ambiguous},
      UnicodeRange{0x2667, 0x266a, CodepointWidth::Ambiguous},
      UnicodeRange{0x266c, 0x266d, CodepointWidth::Ambiguous},
      UnicodeRange{0x266f, 0x266f, CodepointWidth::Ambiguous},
      UnicodeRange{0x267f, 0x267f, CodepointWidth::Wide},
      UnicodeRange{0x2693, 0x2693, CodepointWidth::Wide},
      UnicodeRange{0x269e, 0x269f, CodepointWidth::Ambiguous},
      UnicodeRange{0x26a1, 0x26a1, CodepointWidth::Wide},
      UnicodeRange{0x26aa, 0x26ab, CodepointWidth::Wide},
      UnicodeRange{0x26bd, 0x26be, CodepointWidth::Wide},
      UnicodeRange{0x26bf, 0x26bf, CodepointWidth::Ambiguous},
      UnicodeRange{0x26c4, 0x26c5, CodepointWidth::Wide},
      UnicodeRange{0x26c6, 0x26cd, CodepointWidth::Ambiguous},
      UnicodeRange{0x26ce, 0x26ce, CodepointWidth::Wide},
      UnicodeRange{0x26cf, 0x26d3, CodepointWidth::Ambiguous},
      UnicodeRange{0x26d4, 0x26d4, CodepointWidth::Wide},
      UnicodeRange{0x26d5, 0x26e1, CodepointWidth::Ambiguous},
      UnicodeRange{0x26e3, 0x26e3, CodepointWidth::Ambiguous},
      UnicodeRange{0x26e8, 0x26e9, CodepointWidth::Ambiguous},
      UnicodeRange{0x26ea, 0x26ea, CodepointWidth::Wide},
      UnicodeRange{0x26eb, 0x26f1, CodepointWidth::Ambiguous},
      UnicodeRange{0x26f2, 0x26f3, CodepointWidth::Wide},
      UnicodeRange{0x26f4, 0x26f4, CodepointWidth::Ambiguous},
      UnicodeRange{0x26f5, 0x26f5, CodepointWidth::Wide},
      UnicodeRange{0x26f6, 0x26f9, CodepointWidth::Ambiguous},
      UnicodeRange{0x26fa, 0x26fa, CodepointWidth::Wide},
      UnicodeRange{0x26fb, 0x26fc, CodepointWidth::Ambiguous},
      UnicodeRange{0x26fd, 0x26fd, CodepointWidth::Wide},
      UnicodeRange{0x26fe, 0x26ff, CodepointWidth::Ambiguous},
      UnicodeRange{0x2705, 0x2705, CodepointWidth::Wide},
      UnicodeRange{0x270a, 0x270b, CodepointWidth::Wide},
      UnicodeRange{0x2728, 0x2728, CodepointWidth::Wide},
      UnicodeRange{0x273d, 0x273d, CodepointWidth::Ambiguous},
      UnicodeRange{0x274c, 0x274c, CodepointWidth::Wide},
      UnicodeRange{0x274e, 0x274e, CodepointWidth::Wide},
      UnicodeRange{0x2753, 0x2755, CodepointWidth::Wide},
      UnicodeRange{0x2757, 0x2757, CodepointWidth::Wide},
      UnicodeRange{0x2776, 0x277f, CodepointWidth::Ambiguous},
      UnicodeRange{0x2795, 0x2797, CodepointWidth::Wide},
      UnicodeRange{0x27b0, 0x27b0, CodepointWidth::Wide},
      UnicodeRange{0x27bf, 0x27bf, CodepointWidth::Wide},
      UnicodeRange{0x2b1b, 0x2b1c, CodepointWidth::Wide},
      UnicodeRange{0x2b50, 0x2b50, CodepointWidth::Wide},
      UnicodeRange{0x2b55, 0x2b55, CodepointWidth::Wide},
      UnicodeRange{0x2b56, 0x2b59, CodepointWidth::Ambiguous},
      UnicodeRange{0x2e80, 0x2e99, CodepointWidth::Wide},
      UnicodeRange{0x2e9b, 0x2ef3, CodepointWidth::Wide},
      UnicodeRange{0x2f00, 0x2fd5, CodepointWidth::Wide},
      UnicodeRange{0x2ff0, 0x2ffb, CodepointWidth::Wide},
      UnicodeRange{0x3000, 0x303e, CodepointWidth::Wide},
      UnicodeRange{0x3041, 0x3096, CodepointWidth::Wide},
      UnicodeRange{0x3099, 0x30ff, CodepointWidth::Wide},
      UnicodeRange{0x3105, 0x312e, CodepointWidth::Wide},
      UnicodeRange{0x3131, 0x318e, CodepointWidth::Wide},
      UnicodeRange{0x3190, 0x31ba, CodepointWidth::Wide},
      UnicodeRange{0x31c0, 0x31e3, CodepointWidth::Wide},
      UnicodeRange{0x31f0, 0x321e, CodepointWidth::Wide},
      UnicodeRange{0x3220, 0x3247, CodepointWidth::Wide},
      UnicodeRange{0x3248, 0x324f, CodepointWidth::Ambiguous},
      UnicodeRange{0x3250, 0x32fe, CodepointWidth::Wide},
      UnicodeRange{0x3300, 0x4dbf, CodepointWidth::Wide},
      UnicodeRange{0x4e00, 0xa48c, CodepointWidth::Wide},
      UnicodeRange{0xa490, 0xa4c6, CodepointWidth::Wide},
      UnicodeRange{0xa960, 0xa97c, CodepointWidth::Wide},
      UnicodeRange{0xac00, 0xd7a3, CodepointWidth::Wide},
      UnicodeRange{0xe000, 0xf8ff, CodepointWidth::Ambiguous},
      UnicodeRange{0xf900, 0xfaff, CodepointWidth::Wide},
      UnicodeRange{0xfe00, 0xfe0f, CodepointWidth::Ambiguous},
      UnicodeRange{0xfe10, 0xfe19, CodepointWidth::Wide},
      UnicodeRange{0xfe30, 0xfe52, CodepointWidth::Wide},
      UnicodeRange{0xfe54, 0xfe66, CodepointWidth::Wide},
      UnicodeRange{0xfe68, 0xfe6b, CodepointWidth::Wide},
      UnicodeRange{0xff01, 0xff60, CodepointWidth::Wide},
      UnicodeRange{0xffe0, 0xffe6, CodepointWidth::Wide},
      UnicodeRange{0xfffd, 0xfffd, CodepointWidth::Ambiguous},
      UnicodeRange{0x16fe0, 0x16fe1, CodepointWidth::Wide},
      UnicodeRange{0x17000, 0x187ec, CodepointWidth::Wide},
      UnicodeRange{0x18800, 0x18af2, CodepointWidth::Wide},
      UnicodeRange{0x1b000, 0x1b11e, CodepointWidth::Wide},
      UnicodeRange{0x1b170, 0x1b2fb, CodepointWidth::Wide},
      UnicodeRange{0x1f004, 0x1f004, CodepointWidth::Wide},
      UnicodeRange{0x1f0cf, 0x1f0cf, CodepointWidth::Wide},
      UnicodeRange{0x1f100, 0x1f10a, CodepointWidth::Ambiguous},
      UnicodeRange{0x1f110, 0x1f12d, CodepointWidth::Ambiguous},
      UnicodeRange{0x1f130, 0x1f169, CodepointWidth::Ambiguous},
      UnicodeRange{0x1f170, 0x1f18d, CodepointWidth::Ambiguous},
      UnicodeRange{0x1f18e, 0x1f18e, CodepointWidth::Wide},
      UnicodeRange{0x1f18f, 0x1f190, CodepointWidth::Ambiguous},
      UnicodeRange{0x1f191, 0x1f19a, CodepointWidth::Wide},
      UnicodeRange{0x1f19b, 0x1f1ac, CodepointWidth::Ambiguous},
      UnicodeRange{0x1f200, 0x1f202, CodepointWidth::Wide},
      UnicodeRange{0x1f210, 0x1f23b, CodepointWidth::Wide},
      UnicodeRange{0x1f240, 0x1f248, CodepointWidth::Wide},
      UnicodeRange{0x1f250, 0x1f251, CodepointWidth::Wide},
      UnicodeRange{0x1f260, 0x1f265, CodepointWidth::Wide},
      UnicodeRange{0x1f300, 0x1f320, CodepointWidth::Wide},
      UnicodeRange{0x1f32d, 0x1f335, CodepointWidth::Wide},
      UnicodeRange{0x1f337, 0x1f37c, CodepointWidth::Wide},
      UnicodeRange{0x1f37e, 0x1f393, CodepointWidth::Wide},
      UnicodeRange{0x1f3a0, 0x1f3ca, CodepointWidth::Wide},
      UnicodeRange{0x1f3cf, 0x1f3d3, CodepointWidth::Wide},
      UnicodeRange{0x1f3e0, 0x1f3f0, CodepointWidth::Wide},
      UnicodeRange{0x1f3f4, 0x1f3f4, CodepointWidth::Wide},
      UnicodeRange{0x1f3f8, 0x1f43e, CodepointWidth::Wide},
      UnicodeRange{0x1f440, 0x1f440, CodepointWidth::Wide},
      UnicodeRange{0x1f442, 0x1f4fc, CodepointWidth::Wide},
      UnicodeRange{0x1f4ff, 0x1f53d, CodepointWidth::Wide},
      UnicodeRange{0x1f54b, 0x1f54e, CodepointWidth::Wide},
      UnicodeRange{0x1f550, 0x1f567, CodepointWidth::Wide},
      UnicodeRange{0x1f57a, 0x1f57a, CodepointWidth::Wide},
      UnicodeRange{0x1f595, 0x1f596, CodepointWidth::Wide},
      UnicodeRange{0x1f5a4, 0x1f5a4, CodepointWidth::Wide},
      UnicodeRange{0x1f5fb, 0x1f64f, CodepointWidth::Wide},
      UnicodeRange{0x1f680, 0x1f6c5, CodepointWidth::Wide},
      UnicodeRange{0x1f6cc, 0x1f6cc, CodepointWidth::Wide},
      UnicodeRange{0x1f6d0, 0x1f6d2, CodepointWidth::Wide},
      UnicodeRange{0x1f6eb, 0x1f6ec, CodepointWidth::Wide},
      UnicodeRange{0x1f6f4, 0x1f6f8, CodepointWidth::Wide},
      UnicodeRange{0x1f910, 0x1f93e, CodepointWidth::Wide},
      UnicodeRange{0x1f940, 0x1f94c, CodepointWidth::Wide},
      UnicodeRange{0x1f950, 0x1f96b, CodepointWidth::Wide},
      UnicodeRange{0x1f980, 0x1f997, CodepointWidth::Wide},
      UnicodeRange{0x1f9c0, 0x1f9c0, CodepointWidth::Wide},
      UnicodeRange{0x1f9d0, 0x1f9e6, CodepointWidth::Wide},
      UnicodeRange{0x20000, 0x2fffd, CodepointWidth::Wide},
      UnicodeRange{0x30000, 0x3fffd, CodepointWidth::Wide},
      UnicodeRange{0xe0100, 0xe01ef, CodepointWidth::Ambiguous},
      UnicodeRange{0xf0000, 0xffffd, CodepointWidth::Ambiguous},
      UnicodeRange{0x100000, 0x10fffd, CodepointWidth::Ambiguous}};
  
  size_t CalculateWidthInternal(char32_t rune) {
    const auto it = std::lower_bound(s_wideAndAmbiguousTable.begin(), s_wideAndAmbiguousTable.end(), rune);
  
    // For characters that are not _in_ the table, lower_bound will return the
    // nearest item that is. We must check its bounds to make sure that our hit
    // was a true hit.
    if (it != s_wideAndAmbiguousTable.end() && rune >= it->lowerBound && rune <= it->upperBound) {
      switch (it->width) {
      case CodepointWidth::Ambiguous:
        return 0;
      case CodepointWidth::Wide:
        return 2;
      case CodepointWidth::Narrow:
        return 1;
      default:
        break;
      }
      return 0;
    }
    return 1;
  }
  
  } // namespace unicode
  