Add variant::cast()

sandbox/simple_variant/main.cc

@@ -1,6 +1,7 @@
 #include <string>
+#include <iostream>
 
-#include "simple-variant.hh"
+#include "tiny-variant.hh"
 
 int main(int argc, char **argv) {
 
@@ -17,11 +18,15 @@ int main(int argc, char **argv) {
 
   a.set<float>(1.3f);
 
-  std::cout << "a val = " << a.get<float>() << "\n";
+  std::cout << "a val = " << a.cast<float>() << "\n";
   
   if (auto v = b.get_if<float>()) {
     std::cout << "b val = " << (*v) << "\n";
   }
 
+  if (auto v = b.get<float>()) {
+    std::cout << "b val = " << v.value() << "\n";
+  }
+
   return 0;
 }

src/tiny-variant.hh

@@ -262,11 +262,12 @@ struct variant {
     set<T>(v);
   }
 
-#if 0
+#if 1
+  // allow seg fault.
   template <typename T, typename... Args,
             typename =
                 typename std::enable_if<is_one_of<T, Ts...>::value, void>::type>
-  T& get() {
+  T& cast() {
     // It is a dynamic_cast-like behaviour
     if (variant_id == value::TypeTrait<T>::type_id) {
       return *reinterpret_cast<T*>(&data);