Commits on Jul 5, 2023

1. feat: support Option<fn()> in WrapperApi …

   ```rust
   use dlopen2::wrapper::{Container, WrapperApi};
   use std::os::raw::c_int;
   
   struct Api<'a> {
       c_fun: unsafe extern "C" fn(),
       // A function may not exist in the library.
       c_option_fun: Option<unsafe extern "C" fn() -> c_int>,
   }
   
   fn main(){
       let mut cont: Container<Api> =
           unsafe { Container::load("libexample.so") }.expect("Could not open library or load symbols");
       unsafe{ cont.c_fun() };
   
       if cont.has_c_option_fun() {
         // do something
       }
       // option function returns Option<fn_return_type>, it's Option<c_int> here.
       unsafe{ cont.c_option_fun().map(|i| i == 0) };
   }
   ```

   

   zitsen committed Jul 5, 2023
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