VM basics (#5)

Co-authored-by: Andre Wagner <WagnerAndre@JohnDeere.com>
Reviewed-on: https://192.168.5.48/andre/tyche/pulls/5

src/vm/value.cc

@@ -2,7 +2,7 @@
 
 #include "../common/overloaded.hh"
 
-namespace tyche {
+namespace tyche::vm {
 
 Type Value::type() const
 {
@@ -11,6 +11,18 @@ Type Value::type() const
         [](int32_t)            { return Type::Integer; },
         [](float)              { return Type::Float; },
         [](std::string const&) { return Type::String; },
+        [](Function const&)    { return Type::Function; },
+    }, value_);
+}
+
+std::string Value::to_string() const
+{
+    return std::visit(overloaded {
+        [](std::monostate)       { return std::string("nil"); },
+        [](int32_t i)            { return std::to_string(i); },
+        [](float f)              { return std::to_string(f); },
+        [](std::string const& s) { return s; },
+        [](Function const& f)    { return "@" + std::to_string(f.f_id); }
     }, value_);
 }