Add example file for C++11

Author: quicknir

example11.x.cpp

@@ -0,0 +1,79 @@
+#include "wise_enum.h"
+
+#include <cassert>
+#include <iostream>
+
+// Equivalent to enum Color {GREEN = 2, RED};
+namespace my_lib {
+WISE_ENUM(Color, (GREEN, 2), RED)
+}
+
+// Equivalent to enum class MoreColor : int64_t {BLUE, BLACK = 1};
+WISE_ENUM_CLASS((MoreColor, int64_t), BLUE, (BLACK, 1))
+
+// Inside a class, must use a different macro, but still works
+struct Bar {
+  WISE_ENUM_MEMBER(Foo, BUZ)
+};
+
+// Adapt an existing enum you don't control so it works with generic code
+namespace another_lib {
+enum class SomebodyElse { FIRST, SECOND };
+}
+WISE_ENUM_ADAPT(another_lib::SomebodyElse, FIRST, SECOND)
+
+struct Blub {
+    struct Flub {
+
+        int x = 0;
+
+    };
+};
+
+int main() {
+
+  // Number of enumerations:
+  static_assert(wise_enum::enumerators<my_lib::Color>::size == 2, "");
+  std::cerr << "Number of enumerators: "
+            << wise_enum::enumerators<my_lib::Color>::size << "\n";
+
+  // Iterate over enums
+  std::cerr << "Enum values and names:\n";
+  for (auto e : wise_enum::enumerators<my_lib::Color>::range) {
+    std::cerr << static_cast<int>(e.value) << " " << e.name << "\n";
+  }
+  std::cerr << "\n";
+
+  // Convert any enum to a string
+  std::cerr << wise_enum::to_string(my_lib::Color::RED) << "\n";
+
+  // Convert any string to an optional enum
+  auto x1 = wise_enum::from_string<my_lib::Color>("GREEN");
+  auto x2 = wise_enum::from_string<my_lib::Color>("Greeeeeeen");
+
+  assert(x1.value() == my_lib::Color::GREEN);
+  assert(!x2);
+
+  // Everything is constexpr, and a type trait is made available for easy use in
+  // enable_if/tag dispatch
+  static_assert(wise_enum::is_wise_enum<my_lib::Color>::value, "");
+  static_assert(!wise_enum::is_wise_enum<int>::value, "");
+  enum flub { blub, glub };
+  static_assert(!wise_enum::is_wise_enum<flub>::value, "");
+  // We made a regular enum wise!
+  static_assert(wise_enum::is_wise_enum<another_lib::SomebodyElse>::value, "");
+
+  // Assert underlying type
+  static_assert(
+      std::is_same<int64_t,
+                   typename std::underlying_type<MoreColor>::type>::value,
+      "");
+
+  // Full API available for adapted wise enums
+  for (auto e : wise_enum::enumerators<another_lib::SomebodyElse>::range) {
+    std::cerr << static_cast<int>(e.value) << " "
+              << wise_enum::to_string(e.value) << "\n";
+  }
+
+  return 0;
+}