False positive on templated lambda call

[Sylvain Joubert]

I know there was some recent fixes on C++20 templated lambda, so this may already be fixed. But that seems a slightly different use case, so I prefer to report it as well.

$ cppcheck --version
Cppcheck 2.11

$ cat test.cpp 
int main()
{
  auto test = []<typename T, typename U>(int)
  {
  };
  test.operator()<int, int>(42);
}

$ cppcheck --enable=style --std=c++20 test.cpp 
Checking test.cpp ...
test.cpp:6:22: warning: Found suspicious operator ',', result is not used. [constStatement]
  test.operator()<int, int>(42);
                     ^

This is a weird case of the lambda having template specifier that are not deduced from the parameter call. So one has to explicitly call operator() with the template parameters.

[CHR]

https://trac.cppcheck.net/ticket/11840
Have you considered getting a trac account?

[Sylvain Joubert]

Yes, a couple years ago. But the account creation could be simpler than having to send a password hash to the maintainer so I gave up. I'll look into creating an account again. Thanks for following with the bug reports so far :-)