Support for using ConstString in unordered_maps and switch case statements.

tests/ConstStringTests.cpp

@@ -0,0 +1,26 @@
+#ifdef TESTS_BUILD
+#include <cstring>
+#include <unordered_map>
+#include "../extern/catch.hpp"
+#include "../src/ConstString.hpp"
+
+TEST_CASE("Use const string in unordered_map", "[Utilities]") {
+    std::unordered_map<Arbutils::ConstString, int32_t> map;
+    map.insert({"foo"_c, 1});
+    map.insert({"bar"_c, 5});
+
+    CHECK(map["bar"_c] == 5);
+    CHECK(map["foo"_c] == 1);
+}
+
+TEST_CASE("Use const string in switch case", "[Utilities]") {
+    auto val = Arbutils::ConstString("foobar");
+    switch (val){
+        case "foo"_c: FAIL(); break;
+        case "bar"_c: FAIL(); break;
+        case "foobar"_c: SUCCEED(); break;
+        default: FAIL(); break;
+    }
+}
+
+#endif