日: 2022年7月20日

#include <cppstd.h> // 自製c++標準ライブラリ群

vector<string> hiragana_list = 
    {
    "あ","い","う","え","お",
    "か","き","く","け","こ",
    "さ","し","す","せ","そ",
    "た","ち","つ","て","と",
    "な","に","ぬ","ね","の",
    "は","ひ","ふ","へ","ほ",
    "ま","み","む","め","も",
    "や","ゆ","よ",
    "ら","り","る","れ","ろ",
    "わ","を","ん",
    "が","ぎ","ぐ","げ","ご",
    "ざ","じ","ず","ぜ","ぞ",
    "だ","ぢ","づ","で","ど",
    "ば","び","ぶ","べ","ぼ",
    "ぱ","ぴ","ぷ","ぺ","ぽ",
    "ゃ","ゅ","ょ","っ"
    };

vector<string> str_kana;

string hiragana_extract(string str)
{
    int pos;
    unsigned char lead; 
    int char_size;

   for (pos = 0; pos < str.size(); pos += char_size) {
        lead = str[pos];

        if (lead < 0x80) {
            char_size = 1;
        } else if (lead < 0xE0) { 
            char_size = 2;
        } else if (lead < 0xF0) {
            char_size = 3;
        } else {
            char_size = 4;
        }

        cout << str.substr(pos, char_size) << endl;
        string moji = str.substr(pos, char_size);
        
        for (auto &item : hiragana_list) {
            if (item == moji) {
                str_kana.push_back(moji);
            }
        }
    }

    // vector内ひらがなを結合
    std::ostringstream os;
    std::copy(str_kana.begin(), str_kana.end(), std::ostream_iterator<string>(os));
    string hiragana = os.str(); 

    return hiragana;
}

int main(int argc, char **argv)
{
    string str = "水浅葱 みずあさぎ";

    string hiragana = hiragana_extract(str);

    cout << "ひらがな抽出 " << hiragana << endl;

    return 0;
}
--------------------------------------------------
出力
--------------------------------------------------
水
浅
葱
 
み
ず
あ
さ
ぎ
ひらがな抽出 みずあさぎ