[开发测试]iostream的带颜色输出

用在单元测试很好用

inline std::ostream& red(std::ostream& s)
{
    HANDLE hStdout = GetStdHandle(STD_OUTPUT_HANDLE);
    SetConsoleTextAttribute(hStdout,
        FOREGROUND_RED | FOREGROUND_INTENSITY);
    return s;
}

inline std::ostream& green(std::ostream& s)
{
    HANDLE hStdout = GetStdHandle(STD_OUTPUT_HANDLE);
    SetConsoleTextAttribute(hStdout,
        FOREGROUND_GREEN | FOREGROUND_INTENSITY);
    return s;
}

inline std::ostream& white(std::ostream& s)
{
    HANDLE hStdout = GetStdHandle(STD_OUTPUT_HANDLE);
    SetConsoleTextAttribute(hStdout,
        FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE);
    return s;
}

struct color {
    color(WORD attribute) :m_color(attribute) {};
    WORD m_color;
};

template <class _Elem, class _Traits>
std::basic_ostream<_Elem, _Traits>&
operator<<(std::basic_ostream<_Elem, _Traits>& i, color& c)
{
    HANDLE hStdout = GetStdHandle(STD_OUTPUT_HANDLE);
    SetConsoleTextAttribute(hStdout, c.m_color);
    return i;
}

void show_result(bool b, const char* func) {
    if (b) {
        std::cout << green << "PASSED" << white;
    }
    else {
        std::cout << red << "FAILED" << white;
    }
    std::cout << ":\t" << func << std::endl;
}