From 6e603b412fcc11c550d09eb2e484530db6f0c0a4 Mon Sep 17 00:00:00 2001
From: David Vereb <dev@eriestrayer.com>
Date: Fri, 10 Nov 2017 15:42:32 -0500
Subject: [PATCH] Not sure how to keep Type out of the template while still
 referencing it from the templated class.  i.e. How would I do this:
 "DualLookup::Type"?

---
 DualLookup.h | 14 ++++++++++----
 main.cpp     |  6 +++---
 2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/DualLookup.h b/DualLookup.h
index 4015dfe..73cf91f 100644
--- a/DualLookup.h
+++ b/DualLookup.h
@@ -2,11 +2,8 @@
 #define DVEREB_DUALLOOKUP_H
 
 #include <unordered_map>
-template <class T>
-class DualLookup {
-public:
-	DualLookup();
 
+struct DualLookupBase {
 	// NOTE(dev): Used to determine which version of the string you want:
 	//             1 / OPPOSITE:   The string it maps to, opposite of the one you pass in.
 	//             2 / VALUE:      The string passed via the first  paramater of 'add.'
@@ -17,6 +14,15 @@ public:
 		EQUIVALENT,
 	};
 
+protected:
+	DualLookupBase() {}
+};
+
+template <class T>
+class DualLookup : public DualLookupBase {
+public:
+	DualLookup();
+
 	/* Add a mapped pair to the container
 	 *  returns false if it already exists, regardless of direction
 	 *   (i.e. value->equivilent is a duplicate of equivilent->value)
diff --git a/main.cpp b/main.cpp
index 240b74a..a4de7a2 100644
--- a/main.cpp
+++ b/main.cpp
@@ -65,13 +65,13 @@ TEST_CASE("all tests", "all") {
 			REQUIRE(container.get(1, container_result));
 			CHECK(container_result == 2);
 			container_result = 0;
-			REQUIRE(container.get(1, container_result, DualLookup<int>::Type::OPPOSITE));
+			REQUIRE(container.get(1, container_result, DualLookupBase::Type::OPPOSITE));
 			CHECK(container_result == 2);
 			container_result = 0;
-			REQUIRE(container.get(1, container_result, DualLookup<int>::Type::EQUIVALENT));
+			REQUIRE(container.get(1, container_result, DualLookupBase::Type::EQUIVALENT));
 			CHECK(container_result == 2);
 			container_result = 0;
-			REQUIRE(container.get(1, container_result, DualLookup<int>::Type::VALUE));
+			REQUIRE(container.get(1, container_result, DualLookupBase::Type::VALUE));
 			CHECK(container_result == 1);
 
 			container_result = 0;