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test/source/TestFinally.cpp

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+/////////////////////////////////////////////////////////////////////////////
+// Copyright (c) Electronic Arts Inc. All rights reserved.
+/////////////////////////////////////////////////////////////////////////////
+
+
+#include "EASTLTest.h"
+#include <EASTL/finally.h>
+
+
+int TestFinally()
+{
+	using namespace eastl;
+
+	int nErrorCount = 0;
+
+	{
+		#if defined(EA_COMPILER_CPP17_ENABLED)
+		{
+			// requires CTAD (class template argument deduction)
+			int a = 0;
+			{
+				VERIFY(a == 0);
+				eastl::finally _([&] { a = 42; }); 
+				VERIFY(a == 0);
+			}
+			VERIFY(a == 42);
+		}
+		#endif
+
+		{
+			int a = 0;
+			{
+				VERIFY(a == 0);
+				auto _ = eastl::make_finally([&] { a = 42; });
+				VERIFY(a == 0);
+			}
+			VERIFY(a == 42);
+		}
+
+		{
+			int a = 0;
+			{
+				VERIFY(a == 0);
+				auto f = eastl::make_finally([&] { a = 42; });
+				VERIFY(a == 0);
+				f.dismiss();
+				VERIFY(a == 0);
+			}
+			VERIFY(a == 0);
+		}
+
+		{
+			int a = 0;
+			{
+				VERIFY(a == 0);
+				auto f = eastl::make_finally([&] { a = 42; });
+				VERIFY(a == 0);
+				f.execute();
+				VERIFY(a == 42);
+			}
+			VERIFY(a == 42);
+		}
+		
+		{
+			int a = 0;
+			{
+				VERIFY(a == 0);
+				auto f = eastl::make_finally([&] { a = 42; });
+				VERIFY(a == 0);
+				f.execute();
+				VERIFY(a == 42);
+
+				// verify the finally object doesn't re-run the callback on scope-exit.
+				a = -1;  
+			}
+			VERIFY(a == -1);
+		}
+
+		{
+			struct local_flag { bool b = false; };
+
+			local_flag lf;
+			VERIFY(lf.b == false);
+
+			{ auto _ = eastl::make_finally([&] { lf.b = true; }); }
+
+			VERIFY(lf.b);
+		}
+
+		// This currently does not compile by design.
+		//
+		// {
+		//     int a = 0;
+		//     auto lbda = [&a] { a = 1234; };
+		//     {
+		//         VERIFY(a == 0);
+		//         auto _ = eastl::make_finally(lbda);  // compiler error
+		//         VERIFY(a == 0);
+		//     }
+		//     VERIFY(a == 1234);
+		// }
+	}
+
+	return nErrorCount;
+}
+
+