// Type your code here, or load an example.
import std.stdio: writeln, write;
import std.array: join;
import std.algorithm: map;
import std.conv: to;
import std.traits: fullyQualifiedName;


ref T log_call(alias dg, T, int line = __LINE__, string file = __FILE__,
   string funcName = __FUNCTION__, string prettyFuncName = __PRETTY_FUNCTION__,
   string moduleName = __MODULE__, Args ...)( ref T t, Args args)
{
   string str_args = "";
   foreach (arg; args) {
       str_args ~= arg.to!string ~ ", ";
   }
   writeln(file, " ", line, " ", prettyFuncName, " ", fullyQualifiedName!(dg), "(", str_args, ")");
   
   dg(t, args);
   return t;
}


struct Test {

}

void a(Test) {
   "a() called".writeln();
}

void b(Test) {
   "b() called".writeln();
}

void c(Test, int param1, string param2) {
   "b() called with ".writeln(param1, " ", param2);
}

int main(string[] args) {
   Test t;
   t.log_call!(a)
       .log_call!(b)
       .log_call!(c)(1, "test_param");
   return 0;
}