Class TImplicitlyCastable

util/generic/ptr_ut.cpp:541–558

namespace {
    template <class TFrom, class TTo>
    struct TImplicitlyCastable {
        struct RTYes {
            char t[2];
        };

        using RTNo = char;

        static RTYes Func(TTo);
        static RTNo Func(...);
        static TFrom Get();

        /*
         * Result == (TFrom could be converted to TTo implicitly)
         */
        enum {
            Result = (sizeof(Func(Get())) != sizeof(RTNo))
        };
    };

    struct TImplicitlyCastableToBool {
        inline operator bool() const {