Ichthyostega
806db414dd
* Lumiera source code always was copyrighted by individual contributors * there is no entity "Lumiera.org" which holds any copyrights * Lumiera source code is provided under the GPL Version 2+ == Explanations == Lumiera as a whole is distributed under Copyleft, GNU General Public License Version 2 or above. For this to become legally effective, the ''File COPYING in the root directory is sufficient.'' The licensing header in each file is not strictly necessary, yet considered good practice; attaching a licence notice increases the likeliness that this information is retained in case someone extracts individual code files. However, it is not by the presence of some text, that legally binding licensing terms become effective; rather the fact matters that a given piece of code was provably copyrighted and published under a license. Even reformatting the code, renaming some variables or deleting parts of the code will not alter this legal situation, but rather creates a derivative work, which is likewise covered by the GPL! The most relevant information in the file header is the notice regarding the time of the first individual copyright claim. By virtue of this initial copyright, the first author is entitled to choose the terms of licensing. All further modifications are permitted and covered by the License. The specific wording or format of the copyright header is not legally relevant, as long as the intention to publish under the GPL remains clear. The extended wording was based on a recommendation by the FSF. It can be shortened, because the full terms of the license are provided alongside the distribution, in the file COPYING.
145 lines
5 KiB
C++
145 lines
5 KiB
C++
/*
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Result(Test) - verify the either-result-or-failure intermediary wrapper
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Copyright (C)
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2023, Hermann Vosseler <Ichthyostega@web.de>
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**Lumiera** is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2 of the License, or (at your
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option) any later version. See the file COPYING for further details.
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* *****************************************************************/
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/** @file result-test.cpp
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** unit test \ref Result_test
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*/
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#include "lib/test/run.hpp"
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#include "lib/test/test-helper.hpp"
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#include "lib/result.hpp"
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#include "lib/util.hpp"
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#include <cstdlib>
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namespace lib {
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namespace test{
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using util::isSameObject;
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using std::rand;
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namespace error = lumiera::error;
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using error::LUMIERA_ERROR_FATAL;
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using error::LUMIERA_ERROR_STATE;
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namespace {
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const Literal THE_END = "all dead and hero got the girl";
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#define Type(_EXPR_) lib::test::showType<decltype(_EXPR_)>()
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}
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/***********************************************************************************//**
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* @test Verify an intermediary »Either« type, to embody either a successful result,
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* or document a failure with encountered exception.
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* - when given a value, the Result captures it and is in »left« state
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* - various value types can be picked up by perfect forwarding
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* - when given an exception, the result is in »right« state
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* - option-style `or-else` usage
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* - can invoke arbitrary _callable_ and capture result or exception caught
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* - invocation also works with void functors, and likewise captures failure
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* @see result.hpp
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* @see lib::ThreadJoinable usage example
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*/
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class Result_test
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: public Test
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{
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void
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run (Arg)
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{
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auto happy = Result{THE_END};
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CHECK (happy == THE_END);
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CHECK (happy.isValid());
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CHECK (bool(happy));
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happy.maybeThrow(); // still alive...
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CHECK (Type(happy) == "Result<Literal const&>"_expect);
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// Note type deduction: RValue moved into the Result...
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auto sequel = Result{Literal{THE_END}};
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CHECK (sequel.isValid());
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CHECK (Type(sequel) == "Result<Literal>"_expect);
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CHECK ( isSameObject (happy.get<Literal const&>(), THE_END));
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CHECK (not isSameObject (sequel.get<Literal const&>(), THE_END));
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// »Either Right« case : mark as failure
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Result<double> facepalm{error::Fatal("zOMG")};
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CHECK (not facepalm.isValid());
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VERIFY_ERROR (FATAL, (double)facepalm );
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VERIFY_ERROR (FATAL, facepalm.get<double&>());
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VERIFY_ERROR (FATAL, facepalm.maybeThrow() );
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CHECK (42.0 == facepalm.or_else([]{ return 42; }));
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CHECK (42.0 == facepalm.value_or(210/5));
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// a generic functor (template) to invoke
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auto evil = [](auto it)
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{
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if (it % 2)
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throw error::State{"conspiracy"};
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else
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return it;
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};
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// Invoke failsafe and capture result....
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auto seed = Result{evil, '*'}; // this invocation is successful
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CHECK (Type(seed) == "Result<char>"_expect); // generic λ instantiated with <char>
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CHECK (42 == seed); // int('*') == 42
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auto breed = Result{evil, 55ll}; // an odd number...
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VERIFY_ERROR (STATE, breed.maybeThrow() );
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CHECK (Type(breed) == "Result<long long>"_expect);
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auto dead = Result{[]{ throw 55; }};
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auto deed = Result{[]{ /* :-) */ }};
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CHECK (Type(dead) == "Result<void>"_expect);
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CHECK (Type(deed) == "Result<void>"_expect);
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CHECK (not dead.isValid());
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CHECK ( deed.isValid());
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try { dead.maybeThrow(); } // can handle really *anything* thrown
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catch(int oo)
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{ CHECK (oo == 55); }
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// can also invoke member function....
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auto deaf = Result{&Literal::empty, &THE_END}; // Note: instance "this"-ptr as first argument
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CHECK (deaf.isValid()); // no exception was thrown => state isValid()
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CHECK (deaf == false); // yet invocation of THE_END.empty() yields false
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CHECK (not deaf); // Warning: in this case, the conversion to payload type shadows
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CHECK (Type(deaf) == "Result<bool>"_expect);
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}
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};
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/** Register this test class... */
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LAUNCHER (Result_test, "unit common");
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}} // namespace lib::test
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