Method insert

src/test/prevector_tests.cpp:96–100

    }

    void insert(Size position, const T& value) {
        real_vector.insert(real_vector.begin() + position, value);
        pre_vector.insert(pre_vector.begin() + position, value);
        test();
    }

    void insert(Size position, Size count, const T& value) {
        real_vector.insert(real_vector.begin() + position, count, value);