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TreeExplorer: Sketch how it might be possible to accept generic lambdas

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...based on the research from yesterday
This commit is contained in:
Fischlurch 2017-11-24 19:45:16 +01:00
parent 3614085ff7
commit 4098e2024d
1 changed files with 28 additions and 14 deletions
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42
src/lib/iter-tree-explorer.hpp
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@ -93,7 +93,7 @@ namespace lib {
using std::forward;
using std::function;
namespace iter_source {
namespace iter_explorer {
template<class CON>
using iterator = typename meta::Strip<CON>::TypeReferred::iterator;
@ -229,6 +229,7 @@ namespace lib {
namespace { // TreeExplorer traits
using meta::enable_if;
using meta::disable_if;
using meta::Yes_t;
using meta::No_t;
using meta::_Fun;
@ -268,7 +269,7 @@ namespace lib {
struct _TreeExplorerTraits<SRC, enable_if<is_StateCore<SRC>>>
{
using SrcVal = typename std::remove_reference<decltype(yield (std::declval<SRC>()))>::type;
using SrcIter = iter_source::IterableDecorator<SrcVal, SRC>;
using SrcIter = iter_explorer::IterableDecorator<SrcVal, SRC>;
};
template<class SRC>
@ -282,7 +283,7 @@ namespace lib {
{
static_assert (not std::is_rvalue_reference<SRC>::value,
"container needs to exist elsewhere during the lifetime of the iteration");
using SrcIter = iter_source::StlRange<SRC>;
using SrcIter = iter_explorer::StlRange<SRC>;
};
@ -317,29 +318,44 @@ namespace lib {
}
};
template<class SIG, typename VAL>
template<class FUN, typename IT>
struct _ExpansionTraits
{
using ExpandedChildren = typename _Fun<SIG>::Ret;
template<typename F, typename SEL =void>
struct FunDetector
{
using Sig = typename _Fun<F>::Sig;
};
template<typename F>
struct FunDetector<F, disable_if<_Fun<F>> >
{
using Ret = decltype(std::declval<F>() (std::declval<IT>()));
using Sig = Ret(IT);
};
using Sig = typename FunDetector<FUN>::Sig;
using ExpandedChildren = typename _Fun<Sig>::Ret;
using Core = typename _TreeExplorerTraits<ExpandedChildren>::SrcIter;
using Arg = typename _Fun<SIG>::Args::List::Head;
using Arg = typename _Fun<Sig>::Args::List::Head;
using Functor = ExpaFunc<SIG>;
using Functor = ExpaFunc<Sig>;
};
}//(End) TreeExplorer traits
namespace iter_source {
namespace iter_explorer {
template<class SRC, class SIG>
template<class SRC, class FUN>
class Expander
: public SRC
{
using _Config = _ExpansionTraits<SIG, typename SRC::value_type>;
using _Config = _ExpansionTraits<FUN,SRC>;
using Core = typename _Config::Core;
using ExpandFunctor = typename _Config::Functor;
@ -353,7 +369,6 @@ namespace lib {
Expander() =default;
// inherited default copy operations
template<typename FUN>
Expander (SRC&& parentExplorer, FUN&& expandFunctor)
: SRC{move (parentExplorer)}
, expandChildren_{forward<FUN> (expandFunctor)}
@ -461,12 +476,11 @@ namespace lib {
auto
expand (FUN&& expandFunctor)
{
using FunSig = typename meta::_Fun<FUN>::Sig;
using This = typename meta::Strip<decltype(*this)>::TypeReferred;
using Value = typename This::value_type;
using Core = iter_source::Expander<This, FunSig>;
using Core = iter_explorer::Expander<This, FUN>;
using ExpandableExplorer = iter_source::IterableDecorator<Value, Core>;
using ExpandableExplorer = iter_explorer::IterableDecorator<Value, Core>;
return ExpandableExplorer{move(*this), forward<FUN>(expandFunctor)};
}