Ichthyostega
f8517b7011
Since I've convinced myself during the last years that this kind of typelist programming is ''not a workaround'' — it is even superior to pattern matching on variadics for certain kinds of tasks — the empty struct defined as `NullType` got into more widespread use as a marker type in the Lumiera code base. It seems adequate though to give it a much more evocative name
161 lines
4.8 KiB
C++
161 lines
4.8 KiB
C++
/*
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TupleHelper(Test) - verify helpers for working with tuples and type sequences
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Copyright (C)
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2009, 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 tuple-helper-test.cpp
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** Interplay of typelists, type tuples and std::tuple.
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**
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** @see tuple-helper.hpp
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** @see function-closure.hpp
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** @see control::CmdClosure real world usage example
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**
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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/meta/tuple-helper.hpp"
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#include "meta/typelist-diagnostics.hpp"
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#include "meta/tuple-diagnostics.hpp"
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#include "lib/format-cout.hpp"
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using ::test::Test;
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using lib::test::showSizeof;
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namespace lib {
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namespace meta {
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namespace test {
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namespace { // test data
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typedef TyOLD< Num<1>
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, Num<3>
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, Num<5>
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> Types1;
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typedef TyOLD< Num<2>
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, Num<4>
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> Types2;
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typedef TyOLD< Num<7>> Types3;
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} // (End) test data
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/*********************************************************************//**
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* @test Cover various aspects of the integration of our type sequences
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* with the tuple type from the standard library
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* - verify our generic tuple access decorator
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* - verify generating tuple types from type list processing
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* - TODO more helpers to come
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*/
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class TupleHelper_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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check_diagnostics();
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check_tuple_from_Typelist();
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}
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/** verify the test input data
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* @see TypeListManip_test::check_diagnostics()
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* for an explanation of the DISPLAY macro
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*/
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void
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check_diagnostics ()
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{
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typedef Types1::List L1;
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typedef Types2::List L2;
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typedef Types3::List L3;
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DISPLAY (L1);
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DISPLAY (L2);
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DISPLAY (L3);
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typedef Tuple<Types1> Tup1;
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Tup1 tup1x (Num<1>(11), Num<3>(), 55);
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DISPLAY (Tup1); // prints the type
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DUMPVAL (Tup1()); // prints the contents
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DUMPVAL (tup1x);
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}
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/** @test verify the ability to generate tuple types from typelist metaprogramming
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* - the resulting types are plain flat `std::tuple` instantiations
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* - memory layout is identical to a POD, as expected
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* - our generic string conversion is extended to work with tuples
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*/
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void
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check_tuple_from_Typelist()
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{
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using L1 = Types1::List; // ... start from existing Typelist...
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using T_L1 = Tuple<L1>; // derive a tuple type from this typelist
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using Seq1 = RebindTupleTypes<T_L1>::Seq;
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// extract the underlying type sequence
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DISPLAY (T_L1);
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DISPLAY (Seq1);
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T_L1 tup1; // can be instantiated at runtime (and is just a std:tuple)
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DUMPVAL (tup1);
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using Prepend = Tuple<Node<int, L1>>;
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DISPLAY (Prepend); // another ListType based tuple created by prepending
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Prepend prep (22, 11,33,Num<5>());
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DUMPVAL (prep);
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using NulT = Tuple<TyOLD<> >; // plain-flat empty Tuple
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using NulL = Tuple<Nil>; // list-style empty Tuple
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NulT nulT; // and these, too, can be instantiated
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NulL nulL;
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using S4 = struct{int a,b,c,d;}; // expect this to have the same memory layout
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CHECK (sizeof(S4) == sizeof(prep));
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CHECK (1 == sizeof(nulL)); // ...minimal storage, as expected
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CHECK (is_Tuple<T_L1>());
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CHECK (is_Tuple<Prepend>());
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CHECK (is_Tuple<NulT>());
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CHECK (not is_Tuple<Seq1>());
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cout << tup1 <<endl // these automatically use our generic string conversion
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<< prep <<endl
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<< nulL <<endl;
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cout << showSizeof(tup1) <<endl
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<< showSizeof(prep) <<endl
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<< showSizeof(nulT) <<endl
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<< showSizeof(nulL) <<endl;
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}
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};
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/** Register this test class... */
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LAUNCHER (TupleHelper_test, "unit meta");
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}}} // namespace lib::meta::test
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