Make SetContainer equality work like in C++

src/bindings/SetContainer.h

@@ -66,6 +66,7 @@ namespace BWAPI_Lua
 		userType.set("erase", sol::resolve<SetClass::size_type(const ContainedClass&)>(&SetClass::erase));
 		userType.set("clear", &SetClass::clear);
 		userType.set(sol::meta_function::length, &SetClass::size);
+		userType.set(sol::meta_function::equal_to, [](const SetClass& a, const SetClass& b) { return a == b; });
 		return userType;
 	}
 }

tests/TestBindings/Lua/TestSetContainer.lua

@@ -97,3 +97,17 @@ function clear()
 	set:clear()
 	assert(#set == 0)
 end
+
+-- sets are equal if they are of the same type and have the same contents
+function equality()
+  local set1 = BWAPI.UnitTypeset({BWAPI.UnitTypes.Terran_SCV, BWAPI.UnitTypes.Terran_Firebat})
+  local set2 = BWAPI.UnitTypeset({BWAPI.UnitTypes.Terran_Firebat, BWAPI.UnitTypes.Terran_SCV})
+  local set3 = BWAPI.UnitTypeset({BWAPI.UnitTypes.Terran_Marine})
+  local set4 = BWAPI.DamageTypeset()
+
+  assert(set1 == set1)
+  assert(set1 == set2)
+  assert(set1 ~= set3)
+  assert(set2 ~= set3)
+  assert(set4 ~= set1)
+end

tests/TestBindings/TestSetContainer.cpp

@@ -86,4 +86,11 @@ TEST_CASE("setcontainer bindings", "[setcontainer]")
 		REQUIRE_NOTHROW(test());
 	}
 
+	SECTION("equality")
+	{
+		bindDamageType(lua["BWAPI"]);
+		sol::function test = lua["equality"];
+		REQUIRE_NOTHROW(test());
+	}
+
 }