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Function-Tools: simplify and modernise the main cases

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...to not rely on the old-style signature templates anymore,
i.e. get rid of typename FunctionSignature<function<RET(ARGS...)>>

now, most cases just delegate to the "plain signature" case
This commit is contained in:
Fischlurch 2017-03-19 00:56:52 +01:00
parent f19fabfa3a
commit f8f8cc02d1
1 changed files with 37 additions and 7 deletions
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44
research/try.cpp
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@ -51,7 +51,6 @@ typedef unsigned int uint;
#include <functional>
#include <string>
using lib::meta::_Fun;
using std::function;
using std::placeholders::_1;
@ -62,21 +61,50 @@ using std::tuple;
////////////////############# Investigation of implementation variants
namespace lib {
namespace meta {
template<class C, typename RET, typename...ARGS>
struct _Fun<RET (C::*) (ARGS...)>
template<typename FUN>
struct _FuZ
: _FuZ<decltype(&FUN::operator())>
{ };
/** Specialisation for a bare function signature */
template<typename RET, typename...ARGS>
struct _FuZ<RET(ARGS...)>
{
using Ret = RET;
using Args = Types<ARGS...>;
using Sig = RET(ARGS...);
};
/** Specialisation for using a function pointer */
template<typename SIG>
struct _FuZ<SIG*>
: _FuZ<SIG>
{ };
/** Specialisation when using a function reference */
template<typename SIG>
struct _FuZ<SIG&>
: _FuZ<SIG>
{ };
/** Specialisation to deal with member pointer to function */
template<class C, typename RET, typename...ARGS>
struct _Fun<RET (C::*) (ARGS...) const>
: _Fun<RET (C::*) (ARGS...)>
struct _FuZ<RET (C::*) (ARGS...)>
: _FuZ<RET(ARGS...)>
{ };
/** Specialisation to handle member pointer to const function;
* indirectly this specialisation also handles lambdas,
* as redirected by the main template (via `decltype`) */
template<class C, typename RET, typename...ARGS>
struct _FuZ<RET (C::*) (ARGS...) const>
: _FuZ<RET(ARGS...)>
{ };
}}//namespace lib::meta
using lib::meta::_FuZ;
////////////////############# Investigation of implementation variants
@ -123,7 +151,7 @@ template<typename F>
void
showType (F)
{
using Sig = typename _Fun<F>::Sig;
using Sig = typename _FuZ<F>::Sig;
SHOW_TYPE (F);
SHOW_TYPE (Sig);
@ -167,6 +195,8 @@ main (int, char**)
SHOW_TYPE (decltype(&Funky::operator()));
SHOW_TYPE (decltype(lambda));
SHOW_TYPE (_FuZ<int(uint)>::Sig);
cout << "\n.gulp.\n";
return 0;