Does http::response_parser inherits limits from source parser?

Question

I create http::response_parser<http::buffer_body> and set header_limit and body_limit like this

auto parser = std::make_shared<http::response_parser<http::buffer_body>>();
parser->header_limit(std::numeric_limits<std::uint32_t>::max());
parser->body_limit(std::numeric_limits<std::uint64_t>::max());

Next, I transform the http::response_parser<http::buffer_body> parser into a parser of type http::response_parser<http::string_body> as follows

auto new_parser = std::make_shared<http::response_parser<http::string_body>>(std::move(*parser));

My question is, will new_parser inherit header_limit and body_limit from the original parser or not? I didn't find any methods that could report the current values of the given limits.

In C++ what you refer to is move-semantics, not inheritance. — sehe
– sehe, Commented Aug 5 at 15:38

sehe · Accepted Answer · 2025-08-05 14:37:53Z

4

Yes. The limits are part of basic_parser<> which defines only defaulted move and assignment.

It's also possible to test, using the friend-ness of basic_parser_test:

Live On Coliru

#include <boost/beast.hpp>

namespace boost::beast::http {
    class basic_parser_test {
      public:
        static void foo() {
            auto parser = std::make_shared<http::response_parser<http::buffer_body>>();
            parser->header_limit(std::numeric_limits<std::uint32_t>::max());
            parser->body_limit(std::numeric_limits<std::uint64_t>::max());

            auto new_parser = std::make_shared<http::response_parser<http::string_body>>(std::move(*parser));

            assert(new_parser->body_limit_ == std::numeric_limits<std::uint64_t>::max());
            assert(new_parser->header_limit_ == std::numeric_limits<std::uint32_t>::max());
        }
    };
} // namespace boost::beast::http

int main() {
    boost::beast::http::basic_parser_test::foo();
}

All asserts pass.

answered Aug 5 at 14:37

sehe

400k49 gold badges475 silver badges671 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Joe J Aug 5 at 14:52

Thank you so much!

Collectives™ on Stack Overflow

Does http::response_parser inherits limits from source parser?

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related