utf32-convert-test.cpp

#include <iostream>
#include <string>
#include <locale>
#include <codecvt>

int main()
{
    std::wstring_convert<std::codecvt_utf8<char32_t>, char32_t> converter;
    
    std::string u8str = u8"abcdeあいうえお🗿";
    std::u32string u32str = converter.from_bytes(u8str);
    
    std::cout << "u8str = " << u8str << std::endl;
    std::cout << "u8str.length = " << u8str.length() << std::endl;
    std::cout << "u32str.length = " << u32str.length() << std::endl;
    
    std::cout << "u32str = ";
    for (auto c : u32str)
    {
        std::cout << c << " ";
    }
    std::cout << std::endl;
    
    return 0;
}