Method Tempfile

test/unit/Support.cpp:399–437

This provides no guarantees but is highly likely to work, and it's just for test purposes.

// This provides no guarantees but is highly likely to work, and it's just for test purposes.
Tempfile::Tempfile(bool ascii)
{
    Utils::Random r;

    auto asciiChar = [&r]() -> std::string
    {
        // 10 numbers + 26 lowercase + 26 uppercase = 62 values.
        uint8_t v = (uint8_t)std::uniform_int_distribution<>(0, 61)(r.generator());
        if (v < 10)
            return std::string(1, '0' + v);
        else if (v < 36)
            return std::string(1, 'a' + v - 10);
        return std::string(1, 'A' + v - 36);
    };

    auto latinChar = [&r]() -> std::string
    {
        // The first byte of UTF-8 latin is always C3.
        std::string s(1, (char)0xC3);

        // The second byte of UTF-8 latin in in the range 0x80 - 0xBF;
        const int range = 0xBF - 0x80;
        uint8_t v = (uint8_t)std::uniform_int_distribution<>(0, range)(r.generator());
        s += (char)(0x80 + v);
        return s;
    };

    m_name = temppath() + "tmp";
    if (ascii)
    {
        for (size_t i = 0; i < 20; ++i)
            m_name += asciiChar();
    }
    else // generate some latin and ascii chars
    {
        for (size_t i = 0; i < 20; ++i)
            m_name += i % 2 ? asciiChar() : latinChar();
    }
}

Tempfile::~Tempfile()
{