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

...should document this by a unit-test

research/try.cpp

@@ -71,21 +71,6 @@ using lib::time::Time;
 using std::string;
 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<UgglyTypes> (urgs) <<endl;
     
-    cout << SomeArgs<UgglyTypes,NiceTypes,1>::doIt(std::make_tuple("hui", 88)) <<endl;
     
     cout <<  "\n.gulp.\n";
     

tests/12metaprogramming.tests

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

tests/library/meta/tuple-record-init-test.cpp

@@ -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