In a project, I came accross following line of code.
::std::unordered_map<std::string, Channel*(*)(Module*, const Parameters&)>;
Does anyone know what Channel*(*) could mean? Is is the same as Channel**? It seems confusing and overcomplicated to me.
The Channel constructor looks like this:
Channel(Module* module, const util::Parameters& parameters);
This:
Channel*(*)(Module*, const Parameters&)
Is pointer to a function that takes a Module* and a const Parameters& as argument and returns a Channel*.
For more details see here: https://en.cppreference.com/w/cpp/language/pointer
Function pointers are look rather intimidating, and an alias makes using them much simpler:
using fun = Channel*(Module*, const Parameters&);
fun* x = &some_function_with_right_signature;
// or
::std::unordered_map<std::string,fptr>;