Method grow

include/boost/json/string.hpp:1691–1697

Increase size without changing capacity. This increases the size of the string by `n` characters, adjusting the position of the terminating null character for the new size. The new characters remain uninitialized. This function may be used to append characters directly into the storage between @ref end() and @ref data() ` + ` @ref capacity(). @pre

        @param n The amount to increase the size by.
    */
    void
    grow(std::size_t n) noexcept
    {
        BOOST_ASSERT(
            n <= impl_.capacity() - impl_.size());
        impl_.term(impl_.size() + n);
    }

    /** Swap the contents.