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research finished: build a (compiletime) tuple from runtime sequence

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...should document this by a unit-test
This commit is contained in:
Fischlurch 2016-01-28 15:37:35 +01:00
parent ae7912dc99
commit 47ce7ad96b
3 changed files with 161 additions and 16 deletions
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16
research/try.cpp
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@ -71,21 +71,6 @@ using lib::time::Time;
using std::string; using std::string;
using std::tuple; using std::tuple;
////////////////////////TODO reworked for function-closure.hpp
template<typename TYPES, typename ARGS, size_t start>
struct SomeArgs
{
template<class SRC, class TAR, size_t i>
using IdxSelector = typename lib::meta::func::PartiallyInitTuple<SRC, TAR, start>::template IndexMapper<i>;
static Tuple<TYPES>
doIt (Tuple<ARGS> const& args)
{
return lib::meta::TupleConstructor<TYPES, IdxSelector> (args);
}
};
////////////////////////TODO reworked for function-closure.hpp
@ -145,7 +130,6 @@ main (int, char**)
cout << buildTuple<NiceTypes> (args) <<endl; cout << buildTuple<NiceTypes> (args) <<endl;
cout << buildTuple<UgglyTypes> (urgs) <<endl; cout << buildTuple<UgglyTypes> (urgs) <<endl;
cout << SomeArgs<UgglyTypes,NiceTypes,1>::doIt(std::make_tuple("hui", 88)) <<endl;
cout << "\n.gulp.\n"; cout << "\n.gulp.\n";

5
tests/12metaprogramming.tests
View file

@ -560,6 +560,11 @@ return: 0
END END
PLANNED "tuple initialisation from GenNode" TupleRecordInit_test <<END
return: 0
END
TEST "Typelist combinations generator" GeneratorCombinations_test <<END TEST "Typelist combinations generator" GeneratorCombinations_test <<END
out-lit: Cartesian : out-lit: Cartesian :
out-lit: +---<1>-<2>-+ out-lit: +---<1>-<2>-+

156
tests/library/meta/tuple-record-init-test.cpp Normal file
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@ -0,0 +1,156 @@
/*
TupleRecordInit(Test) - to build a tuple from a GenNode sequence
Copyright (C) Lumiera.org
2016, Hermann Vosseler <Ichthyostega@web.de>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
* *****************************************************/
/** @file tuple-record-init-test.cpp
** Metaprogramming: how to unload the contents of a runtime typed variant sequence
** into ctor arguments of a (compile time typed) tuple. This involves two problems
** - how to combine iteration, compile-time indexing and run-time access.
** - how to overcome the runtime-to-compiletime barrier, using a pre-generated
** double-dispatch (visitor).
**
** The concrete problem prompting this research is the necessity to receive
** a command invocation parameter tuple from a Record<GenNode>
**
*/
typedef unsigned int uint;
#include "lib/test/run.hpp"
#include "lib/symbol.hpp"
#include "lib/time/timevalue.hpp"
#include "lib/meta/tuple-record-init.hpp"
#include "lib/format-cout.hpp"
#include "lib/format-util.hpp"
#include <boost/noncopyable.hpp>
#include <string>
using lib::Literal;
using lib::Variant;
using lib::idi::EntryID;
using lib::diff::Rec;
using lib::diff::MakeRec;
using lib::diff::GenNode;
using lib::meta::Types;
using lib::meta::Tuple;
using lib::meta::buildTuple;
using lib::time::TimeVar;
using lib::time::Time;
using std::string;
using std::tuple;
namespace lib {
namespace meta {
namespace test {
////////////////////////TODO reworked for function-closure.hpp
template<typename TYPES, typename ARGS, size_t start>
struct SomeArgs
{
template<class SRC, class TAR, size_t i>
using IdxSelector = typename lib::meta::func::PartiallyInitTuple<SRC, TAR, start>::template IndexMapper<i>;
static Tuple<TYPES>
doIt (Tuple<ARGS> const& args)
{
return lib::meta::TupleConstructor<TYPES, IdxSelector> (args);
}
};
////////////////////////TODO reworked for function-closure.hpp
#define SHOW_TYPE(_TY_) \
cout << "typeof( " << STRINGIFY(_TY_) << " )= " << lib::meta::typeStr<_TY_>() <<endl;
#define EVAL_PREDICATE(_PRED_) \
cout << STRINGIFY(_PRED_) << "\t : " << _PRED_ <<endl;
void
verifyConversions()
{
using lib::meta::GenNodeAccessor;
using std::is_arithmetic;
using std::is_floating_point;
using lib::meta::is_nonFloat;
using lib::hash::LuidH;
EVAL_PREDICATE(is_arithmetic<int> ::value)
EVAL_PREDICATE(is_arithmetic<size_t> ::value)
EVAL_PREDICATE(is_floating_point<size_t>::value)
EVAL_PREDICATE(is_nonFloat<size_t> ::value)
EVAL_PREDICATE(GenNodeAccessor<int> ::allow_Conversion<size_t> ::value)
EVAL_PREDICATE(GenNodeAccessor<int64_t>::allow_Conversion<long int>::value)
EVAL_PREDICATE(GenNodeAccessor<double>::allow_Conversion<int64_t>::value)
EVAL_PREDICATE(GenNodeAccessor<LuidH>::allow_Conversion<int64_t> ::value)
EVAL_PREDICATE(GenNodeAccessor<LuidH>::allow_Conversion<int16_t> ::value)
EVAL_PREDICATE(GenNodeAccessor<LuidH>::allow_Conversion<uint16_t>::value)
EVAL_PREDICATE(GenNodeAccessor<LuidH> ::allow_Conversion<LuidH> ::value)
EVAL_PREDICATE(GenNodeAccessor<int64_t> ::allow_Conversion<LuidH>::value)
EVAL_PREDICATE(GenNodeAccessor<uint64_t>::allow_Conversion<LuidH>::value)
EVAL_PREDICATE(GenNodeAccessor<uint32_t>::allow_Conversion<LuidH>::value)
EVAL_PREDICATE(GenNodeAccessor<int32_t> ::allow_Conversion<LuidH>::value)
cout <<endl<<endl;
}
class TupleRecordInit_test : public Test
{
virtual void
run (Arg)
{
verifyConversions();
using NiceTypes = Types<string, int>;
using UgglyTypes = Types<EntryID<long>, string, int, int64_t, double, TimeVar>;
Rec args = MakeRec().scope("lalü", 42);
Rec urgs = MakeRec().scope("lalü", "lala", 12, 34, 5.6, Time(7,8,9));
cout << args <<endl;
cout << urgs <<endl;
cout << buildTuple<NiceTypes> (args) <<endl;
cout << buildTuple<UgglyTypes> (urgs) <<endl;
cout << SomeArgs<UgglyTypes,NiceTypes,1>::doIt(std::make_tuple("hui", 88)) <<endl;
cout << "\n.gulp.\n";
}
};
/** Register this test class... */
LAUNCHER (TupleRecordInit_test, "unit meta");
}}} // namespace lib::meta::test