Class FormatListN

tinyformat.h:959–994

// Format list subclass with fixed storage to avoid dynamic allocation
template<int N>
class FormatListN : public FormatList
{
    public:
#ifdef TINYFORMAT_USE_VARIADIC_TEMPLATES
        template<typename... Args>
        FormatListN(const Args&... args)
            : FormatList(&m_formatterStore[0], N),
            m_formatterStore { FormatArg(args)... }
        { static_assert(sizeof...(args) == N, "Number of args must be N"); }
#else // C++98 version
        void init(int) {}
#       define TINYFORMAT_MAKE_FORMATLIST_CONSTRUCTOR(n)                \
                                                                        \
        template<TINYFORMAT_ARGTYPES(n)>                                \
        FormatListN(TINYFORMAT_VARARGS(n))                              \
            : FormatList(&m_formatterStore[0], n)                       \
        { TINYFORMAT_ASSERT(n == N); init(0, TINYFORMAT_PASSARGS(n)); } \
                                                                        \
        template<TINYFORMAT_ARGTYPES(n)>                                \
        void init(int i, TINYFORMAT_VARARGS(n))                         \
        {                                                               \
            m_formatterStore[i] = FormatArg(v1);                        \
            init(i+1 TINYFORMAT_PASSARGS_TAIL(n));                      \
        }

        TINYFORMAT_FOREACH_ARGNUM(TINYFORMAT_MAKE_FORMATLIST_CONSTRUCTOR)
#       undef TINYFORMAT_MAKE_FORMATLIST_CONSTRUCTOR
#endif
        FormatListN(const FormatListN& other)
            : FormatList(&m_formatterStore[0], N)
        { std::copy(&other.m_formatterStore[0], &other.m_formatterStore[N],
                    &m_formatterStore[0]); }

    private:
        FormatArg m_formatterStore[N];
};

// Special 0-arg version - MSVC says zero-sized C array in struct is nonstandard
template<> class FormatListN<0> : public FormatList