Building the code

[bharat76]

Hey @chriskohlhoff it is amazing talk indeed.
I find useful if you can update the Makefile. -fcoroutines is needed atleast on Ubuntu 20.04 using gcc.

CXXFLAGS=-std=c++20 -pthread -Wall -Wextra -fcoroutines -fno-inline -I$(ASIO_ROOT)/include -g -DASIO_ENABLE_HANDLER_TRACKING
SOURCE=$(wildcard *.cpp)
PROGRAMS=$(SOURCE:.cpp=)
DSYM=$(SOURCE:.cpp=.dSYM)

all: $(PROGRAMS)

clean:
	rm -rf $(PROGRAMS) $(DSYM)

[theSundayProgrammer]

Error compiling code:
auto listen_endpoint =
*tcp::resolver(ctx).resolve(
argv[1],
argv[2],
tcp::resolver::passive
);

g++ -std=c++20 -Wall -Wextra -fno-inline -I../../asio-1.36.0/include -g -DASIO_ENABLE_HANDLER_TRACKING    step_0.cpp   -o step_0
step_0.cpp: In function ‘int main(int, char**)’:
step_0.cpp:162:9: error: ‘const asio::ip::basic_resolver_entry<InternetProtocol>& asio::ip::basic_resolver_iterator<InternetProtocol>::operator*() const [with InternetProtocol = asio::ip::tcp]’ is inaccessible within this context
  162 |         );
      |         ^
In file included from ../../asio-1.36.0/include/asio/ip/basic_resolver.hpp:30,
                 from ../../asio-1.36.0/include/asio.hpp:122,
                 from step_0.cpp:4:
../../asio-1.36.0/include/asio/ip/basic_resolver_iterator.hpp:112:49: note: declared here
  112 |   const basic_resolver_entry<InternetProtocol>& operator*() const
      |                                                 ^~~~~~~~
step_0.cpp:162:9: error: ‘asio::ip::basic_resolver_iterator<asio::ip::tcp>’ is not an accessible base of ‘asio::ip::basic_resolver<asio::ip::tcp>::results_type’ {aka ‘asio::ip::basic_resolver_results<asio::ip::tcp>’}
  162 |         );
      |         ^
step_0.cpp:168:9: error: ‘const asio::ip::basic_resolver_entry<InternetProtocol>& asio::ip::basic_resolver_iterator<InternetProtocol>::operator*() const [with InternetProtocol = asio::ip::tcp]’ is inaccessible within this context
  168 |         );
      |         ^
../../asio-1.36.0/include/asio/ip/basic_resolver_iterator.hpp:112:49: note: declared here
  112 |   const basic_resolver_entry<InternetProtocol>& operator*() const
      |                                                 ^~~~~~~~
step_0.cpp:168:9: error: ‘asio::ip::basic_resolver_iterator<asio::ip::tcp>’ is not an accessible base of ‘asio::ip::basic_resolver<asio::ip::tcp>::results_type’ {aka ‘asio::ip::basic_resolver_results<asio::ip::tcp>’}
  168 |         );
      |         ^
make: *** [<builtin>: step_0] Error 1

Running g++ 13.3.0
g++ (Ubuntu 13.3.0-6ubuntu2~24.04.1) 13.3.0