Some examples fail to compile on linux

[ivmidable]

examples/EchoServer.cpp: In function ‘int main()’:
examples/EchoServer.cpp:45:6: error: no matching function for call to ‘uWS::TemplatedApp::ws<main()::PerSocketData>(const char [3], )’
}).listen(9001, [](auto token) {
^
In file included from examples/EchoServer.cpp:2:
src/App.h:104:20: note: candidate: ‘template uWS::TemplatedApp&& uWS::TemplatedApp::ws(std::__cxx11::string, uWS::TemplatedApp::WebSocketBehavior&&) [with UserData = UserData; bool SSL = true]’
TemplatedApp &&ws(std::string pattern, WebSocketBehavior &&behavior) {
^~
src/App.h:104:20: note: template argument deduction/substitution failed:
examples/EchoServer.cpp:45:6: note: cannot convert ‘{SHARED_COMPRESSOR, (16 * 1024), 10, ((1 * 1024) * 1024), main()::<lambda(auto:11)>{}, main()::<lambda(auto:12*, std::string_view, uWS::OpCode)>{}, main()::<lambda(auto:13*)>{}, main()::<lambda(auto:14*)>{}, main()::<lambda(auto:15*)>{}, main()::<lambda(auto:16*, int, std::string_view)>{}}’ (type ‘’) to type ‘uWS::TemplatedApp::WebSocketBehavior&&’
}).listen(9001, [](auto token) {
^
examples/EchoServerThreaded.cpp: In lambda function:
examples/EchoServerThreaded.cpp:43:14: error: no matching function for call to ‘uWS::TemplatedApp::ws<main()::PerSocketData>(const char [3], )’
}).listen(9001, [](auto token) {
^
In file included from examples/EchoServerThreaded.cpp:1:
src/App.h:104:20: note: candidate: ‘template uWS::TemplatedApp&& uWS::TemplatedApp::ws(std::__cxx11::string, uWS::TemplatedApp::WebSocketBehavior&&) [with UserData = UserData; bool SSL = false]’
TemplatedApp &&ws(std::string pattern, WebSocketBehavior &&behavior) {
^~
src/App.h:104:20: note: template argument deduction/substitution failed:
examples/EchoServerThreaded.cpp:43:14: note: cannot convert ‘{SHARED_COMPRESSOR, (16 * 1024), 10, ((1 * 1024) * 1024), main()::<lambda(std::thread)>::<lambda()>::<lambda(auto:11)>{}, main()::<lambda(std::thread*)>::<lambda()>::<lambda(auto:12*, std::string_view, uWS::OpCode)>{}, main()::<lambda(std::thread*)>::<lambda()>::<lambda(auto:13*)>{}, main()::<lambda(std::thread*)>::<lambda()>::<lambda(auto:14*)>{}, main()::<lambda(std::thread*)>::<lambda()>::<lambda(auto:15*)>{}, main()::<lambda(std::thread*)>::<lambda()>::<lambda(auto:16*, int, std::string_view)>{}}’ (type ‘’) to type ‘uWS::TemplatedApp::WebSocketBehavior&&’
}).listen(9001, [](auto token) {
^
examples/BroadcastingEchoServer.cpp: In function ‘int main()’:
examples/BroadcastingEchoServer.cpp:46:6: error: no matching function for call to ‘uWS::TemplatedApp::ws<main()::PerSocketData>(const char [3], )’
}).listen(9001, [](auto token) {
^
In file included from examples/BroadcastingEchoServer.cpp:1:
src/App.h:104:20: note: candidate: ‘template uWS::TemplatedApp&& uWS::TemplatedApp::ws(std::__cxx11::string, uWS::TemplatedApp::WebSocketBehavior&&) [with UserData = UserData; bool SSL = false]’
TemplatedApp &&ws(std::string pattern, WebSocketBehavior &&behavior) {
^~
src/App.h:104:20: note: template argument deduction/substitution failed:
examples/BroadcastingEchoServer.cpp:46:6: note: cannot convert ‘{DEDICATED_COMPRESSOR_3KB, ((16 * 1024) * 1024), 10, ((1 * 1024) * 1024), main()::<lambda(auto:11)>{}, main()::<lambda(auto:12, std::string_view, uWS::OpCode)>{}, main()::<lambda(auto:13*)>{}, main()::<lambda(auto:14*)>{}, main()::<lambda(auto:15*)>{}, main()::<lambda(auto:16*, int, std::string_view)>{}}’ (type ‘’) to type ‘uWS::TemplatedApp::WebSocketBehavior&&’
}).listen(9001, [](auto *token) {
^

[ghost]

You probably have a too old compiler, try with GCC 9 or Clang 10

[hst-m]

for Ubuntu 20.04 can just do sudo apt install -y clang build-essential libssl-dev zlib1g-dev to make everything, examples, benchmarks, uwebsockets, uwebsockets.js, usockets

[ivmidable]

Ah crap sorry about that, I was on GCC 8. It's working now.

[ghost]

No problem, I need to update the user manual in this regard since it does require C++20