Ichthyostega
fc193da1ac
- leave out the type conversion part - instead verify error handling on some typical corner cases
140 lines
4.5 KiB
C++
140 lines
4.5 KiB
C++
/*
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TupleRecordInit(Test) - to build a tuple from a GenNode sequence
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Copyright (C) Lumiera.org
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2016, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* *****************************************************/
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///@file
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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/time/timevalue.hpp"
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#include "lib/meta/tuple-record-init.hpp"
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#include "lib/format-cout.hpp"
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#include "lib/format-util.hpp"
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#include <boost/noncopyable.hpp>
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#include <string>
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using lib::Literal;
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using lib::Variant;
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using lib::idi::EntryID;
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using lib::diff::Rec;
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using lib::diff::MakeRec;
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using lib::diff::GenNode;
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using lib::meta::Types;
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using lib::meta::Tuple;
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using lib::meta::buildTuple;
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using lib::time::TimeVar;
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using lib::time::Time;
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using lumiera::error::LUMIERA_ERROR_INDEX_BOUNDS;
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using lumiera::error::LUMIERA_ERROR_WRONG_TYPE;
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using std::string;
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using std::tuple;
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using std::get;
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namespace lib {
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namespace meta {
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namespace test {
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/*************************************************************************//**
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* @test Metaprogramming: how to unload the contents of a runtime typed
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* variant sequence into ctor arguments of a (compile time typed) tuple.
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*
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* This involves two problems
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* - how to combine iteration, compile-time indexing and run-time access.
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* - how to overcome the runtime-to-compile-time barrier, using a
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* pre-generated double-dispatch (visitor).
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*
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* The concrete problem leading to the development of such a generic
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* converter was the necessity to receive a command invocation
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* parameter tuple from a Record<GenNode> sent via the UI-Bus.
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* @see ElementExtractor
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* @see GenNodeAccessor
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* @see BusTerm_test::commandInvocation
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* @see gui::test::Nexus::prepareDiagnosticCommandHandler
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* @see ui-bus.hpp UI-Bus
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*/
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class TupleRecordInit_test : public Test
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{
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virtual void
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run (Arg)
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{
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show_simpleUsage();
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verify_errorHandling();
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}
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void
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show_simpleUsage()
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{
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using NiceTypes = Types<string, int>;
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using UgglyTypes = Types<EntryID<long>, string, int, int64_t, double, TimeVar>;
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Rec args = MakeRec().scope("lalü", 42);
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Rec urgs = MakeRec().scope("lalü", "lala", 12, 34, 5.6, Time(7,8,9));
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cout << args <<endl;
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cout << urgs <<endl;
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cout << buildTuple<NiceTypes> (args) <<endl;
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cout << buildTuple<UgglyTypes> (urgs) <<endl;
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}
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void
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verify_errorHandling()
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{
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Rec args = MakeRec().scope("surprise", 42);
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using TooMany = Types<string, int, long>;
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VERIFY_ERROR (INDEX_BOUNDS, buildTuple<TooMany> (args)); // number of types in tuple exceeds capacity of the supplied argument record
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using Unsigned = Types<string, uint>;
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using Floating = Types<string, float>;
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using Narrowing = Types<string, short>;
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VERIFY_ERROR (WRONG_TYPE, buildTuple<Unsigned> (args)); // dangerous conversion from signed to unsigned int is prohibited
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VERIFY_ERROR (WRONG_TYPE, buildTuple<Floating> (args)); // conversion from integral to floating point element is prohibited
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VERIFY_ERROR (WRONG_TYPE, buildTuple<Narrowing> (args)); // narrowing conversion from int to short is prohibited
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// yet other (non-numeric) conversions are still possible
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Rec arg1 = MakeRec().scope(Time(1,2,3,4));
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using TupStr = Types<string>;
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Tuple<TupStr> tup = buildTuple<TupStr> (arg1);
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CHECK (std::get<string> (tup) == "4:03:02.001");
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CHECK (string(Time(1,2,3,4)) == "4:03:02.001");
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}
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};
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/** Register this test class... */
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LAUNCHER (TupleRecordInit_test, "unit meta");
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}}} // namespace lib::meta::test
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