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experiment: generate both the functor and the handling function

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this pinpoints a compatibility problem:

our lib::meta::Types<...> type sequence is not compatible
with variadic template parameters, since it uses a fixed
list of NullType default arguments to absorb the variable
number of types.

--> TODO: switch lib::meta::Types to variadic arguments!
This commit is contained in:
Fischlurch 2016-01-15 23:42:49 +01:00
parent 6ae8ad5d0b
commit 9c346ca914
1 changed files with 51 additions and 23 deletions
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74
research/try.cpp
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@ -56,6 +56,8 @@ typedef unsigned int uint;
#include <string>
//using lib::diff::GenNode;
using lib::meta::Types;
using lib::meta::NullType;
using proc::control::CommandSignature;
using proc::control::CommandDef;
using lib::time::Time;
@ -68,30 +70,53 @@ using std::string;
using VecS = vector<string>;
template<typename...TYPES>
struct TyS
{
using Seq = TyS;
};
template<typename X>
struct ArgSeq;
template<typename RET, typename...TYPES>
struct ArgSeq<RET(TYPES...)>
{
using Seq = TyS<TYPES...>;
};
template<typename...ARGS>
void
operate (ARGS const& ...args)
struct Funny
{
VecS strs = stringify<VecS> (args...);
cout << join (strs);
}
static void
operate (ARGS const& ...args)
{
VecS strs = stringify<VecS> (args...);
cout << join (strs);
}
static string
capture (ARGS const& ...args)
{
VecS strs = stringify<VecS> (args...);
return join (strs);
}
static void
undo (ARGS const& ...args, string plonk)
{
VecS strs = stringify<VecS> (args...);
cout << "UNDO..." << plonk << "args=" << join (strs);
}
};
template<typename...ARGS>
string
capture (ARGS const& ...args)
{
VecS strs = stringify<VecS> (args...);
return join (strs);
}
struct Funny<TyS<ARGS...>>
: Funny<ARGS...>
{ };
template<typename...ARGS>
void
undo (ARGS const& ...args)
{
VecS strs = stringify<VecS> (args...);
cout << "UNDO..." << join (strs);
}
@ -104,10 +129,10 @@ undo (ARGS const& ...args)
int
main (int, char**)
{
cout << capture ("lalü", string("lala"), 12, 34L, 56.78) <<endl;
cout << Funny<const char*, string, int, long, double>::capture ("lalü", string("lala"), 12, 34L, 56.78) <<endl;
auto ops = operate<double,Time>;
auto ops = Funny<double,Time>::operate;
using FunnySIG = lib::meta::_Fun<typeof(ops)>::Sig;
@ -119,15 +144,18 @@ main (int, char**)
SHOW_TYPE (SIG_Cap);
SHOW_TYPE (SIG_Udo);
using ArgS = ArgSeq<SIG_Opr>::Seq;
SHOW_TYPE (ArgS);
function<SIG_Opr> funny;
function<SIG_Cap> capy;
function<SIG_Udo> undy;
cout << "funny? " << bool(funny) <<endl;
funny = operate<double,Time>;
capy = capture<double,Time>;
undy = undo<double,Time,string>;
funny = Funny<ArgS>::operate;
capy = Funny<ArgS>::capture;
undy = Funny<ArgS>::undo;
cout << "funny? " << bool(funny) <<endl;
cout << capy (98.7654321987654321987654321, Time(1,2,3,4)) <<endl;