Method begin

examples/server/json.hpp:5255–5258

return iterator begin (needed for range-based for)

    /// return iterator begin (needed for range-based for)
    iteration_proxy_value<IteratorType> begin() const noexcept
    {
        return iteration_proxy_value<IteratorType>(container->begin());
    }

    /// return iterator end (needed for range-based for)
    iteration_proxy_value<IteratorType> end() const noexcept