UFCS try to match with calling get() method on obj

In example of using fopen the code looks like:

main: () -> int = {
    myfile := fopen("file-opened-with-c-function.txt", "w");
    myfile.fprintf("Unified Function Call Syntax Rocks!\n\n");
    myfile.fclose();
}

there is a need to call fclose at the end of scope.

We can introduce better_fopen that will return unique_prt
with fclose as a deleter.

main: () -> int = {
    myfile := better_fopen("file-opened-with-c-function.txt", "w");
    myfile.fprintf("Unified Function Call Syntax Rocks!\n\n");
}

That will ensure closing but will not work with UFCS.
In this change we added a check
(after other matches failed) if there is a call to get() method
that match a function signature.

Author: filipsajdak

include/cpp2util.h

@@ -460,6 +460,10 @@ class out {
 [](auto&& obj, auto&& ...params) { \
     if constexpr (requires{ std::forward<decltype(obj)>(obj).FUNCNAME(std::forward<decltype(params)>(params)...); }) { \
         return std::forward<decltype(obj)>(obj).FUNCNAME(std::forward<decltype(params)>(params)...); \
+    } else if constexpr ( requires{ FUNCNAME(std::forward<decltype(obj)>(obj), std::forward<decltype(params)>(params)...); }){ \
+        return FUNCNAME(std::forward<decltype(obj)>(obj), std::forward<decltype(params)>(params)...); \
+    } else if constexpr (requires{ FUNCNAME(std::forward<decltype(obj.get())>(obj.get()),std::forward<decltype(params)>(params)...); }) { \
+        return FUNCNAME(std::forward<decltype(obj.get())>(obj.get()), std::forward<decltype(params)>(params)...); \
     } else { \
         return FUNCNAME(std::forward<decltype(obj)>(obj), std::forward<decltype(params)>(params)...); \
     } \
@@ -469,6 +473,10 @@ class out {
 [](auto&& obj) { \
     if constexpr (requires{ std::forward<decltype(obj)>(obj).FUNCNAME(); }) { \
         return std::forward<decltype(obj)>(obj).FUNCNAME(); \
+    } else if constexpr ( requires{ FUNCNAME(std::forward<decltype(obj)>(obj)); }) { \
+        return FUNCNAME(std::forward<decltype(obj)>(obj)); \
+    } else if constexpr (requires{ FUNCNAME(std::forward<decltype(obj.get())>(obj.get())); }) { \
+        return FUNCNAME(std::forward<decltype(obj.get())>(obj.get())); \
     } else { \
         return FUNCNAME(std::forward<decltype(obj)>(obj)); \
     } \