Method capacity

include/boost/json/string.hpp:1036–1040

Return the number of characters that can be held in currently allocated memory. Returns the number of characters that the container has currently allocated space for. This number is never smaller than the value returned by @ref size(). @par Complexity Constant. @par Exception Safety No-throw guarantee. */

        No-throw guarantee.
    */
    std::size_t
    capacity() const noexcept
    {
        return impl_.capacity();
    }

    /** Increase the capacity to at least a certain amount.