include/sol/optional_implementation.hpp:2194:10: error: no member named 'construct' in 'optional<type-parameter-0-0 &>'

[skhaz]

(carimbo) λ /opt/workspace/carimbolabs/carimbo/ main* cmake --build build --parallel 8
[  2%] Building CXX object CMakeFiles/carimbo.dir/cmake_pch.hxx.pch
In file included from <built-in>:1:
In file included from /opt/workspace/carimbolabs/carimbo/build/CMakeFiles/carimbo.dir/cmake_pch.hxx:5:
In file included from /opt/workspace/carimbolabs/carimbo/src/anchor.hpp:3:
In file included from /opt/workspace/carimbolabs/carimbo/src/common.hpp:30:
In file included from /Users/me/.conan2/p/sol2f5e2ff06954f4/p/include/sol/sol.hpp:52:
In file included from /Users/me/.conan2/p/sol2f5e2ff06954f4/p/include/sol/stack.hpp:27:
In file included from /Users/me/.conan2/p/sol2f5e2ff06954f4/p/include/sol/trampoline.hpp:27:
In file included from /Users/me/.conan2/p/sol2f5e2ff06954f4/p/include/sol/types.hpp:28:
In file included from /Users/me/.conan2/p/sol2f5e2ff06954f4/p/include/sol/optional.hpp:33:
/Users/me/.conan2/p/sol2f5e2ff06954f4/p/include/sol/optional_implementation.hpp:2194:10: error: no member named 'construct' in 'optional<type-parameter-0-0 &>'
 2194 |                         this->construct(std::forward<Args>(args)...);
      |                         ~~~~  ^
1 error generated.

[skhaz]

Temporary workaround

for file in /home/runner/.conan2/p/sol2*/p/include/sol/optional_implementation.hpp; do
  if [[ -f "$file" ]]; then
    sed -i 's/this->construct(std::forward<Args>(args)...);/this->emplace(std::forward<Args>(args)...);/' "$file"
  fi
done

[Shucharjer]

void foo() { std::cout << "hello world\n"; }

TEST_CASE("a simple case) {
    sol::state lua;
    lua.set_function("foo", foo);
    lua.script("foo()");
}

Then we could get same error.

Another thing is I was able to run this kind of code when using Clang 18.1.7.
But I encountered a bug that caused the code (also a template) that should have been able to compile to report an error,
I updated my Clang to 19.1.5, solved my error, meeting this error.
I think this might have to do with compiler doing stricter template argument checking.
What's your compiler? Version?

[skhaz]

It only happens on emsdk/3.1.72 which ships it owns version of llvm/clang.