LeechCraft  0.6.70-10870-g558588d6ec
Modular cross-platform feature rich live environment.
typegetter.h
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29 
30 #pragma once
31 
32 #include <tuple>
33 #include <type_traits>
34 
35 namespace LeechCraft
36 {
37 namespace Util
38 {
39  namespace detail
40  {
41  struct ReturnsVoid;
42 
43  template<typename T>
44  using VoidSafe = std::conditional_t<
45  std::is_same<T, void> {}, // C++17
46  ReturnsVoid,
47  T
48  >;
49 
50  template<typename R, typename... Args>
51  std::tuple<VoidSafe<R>, Args...> TypeGetter (R (*) (Args...));
52 
53  template<typename F>
54  auto TypeGetter (F&& f) -> decltype (TypeGetter (+f));
55 
56  template<typename C, typename R, typename... Args>
57  std::tuple<VoidSafe<R>, Args...> TypeGetter (R (C::*) (Args...) const);
58 
59  template<typename C, typename R, typename... Args>
60  std::tuple<VoidSafe<R>, Args...> TypeGetter (R (C::*) (Args...));
61 
62  template<typename C>
63  decltype (TypeGetter (&C::operator ())) TypeGetter (const C& c);
64 
65  template<typename F>
66  using RetTypeRaw_t = std::tuple_element_t<0, decltype (TypeGetter (*static_cast<F*> (nullptr)))>;
67  }
68 
69  template<typename F, size_t Idx>
70  using ArgType_t = std::tuple_element_t<Idx + 1, decltype (detail::TypeGetter (*static_cast<F*> (nullptr)))>;
71 
72  template<typename F>
73  using RetType_t = std::conditional_t<
74  std::is_same_v<detail::RetTypeRaw_t<F>, detail::ReturnsVoid>,
75  void,
76  detail::RetTypeRaw_t<F>
77  >;
78 
79  namespace detail
80  {
81  template<typename>
83 
84  template<typename R, typename C>
85  struct DecomposeMemberPtr<R (C::*)>
86  {
87  using Value_t = R;
88  using StructType_t = C;
89  };
90  }
91 
92  template<auto Ptr>
94 
95  template<auto Ptr>
97 }
98 }
constexpr detail::ExprTree< detail::ExprType::LeafStaticPlaceholder, detail::MemberPtrs< Ptr > > f
Definition: oral.h:931
typename detail::DecomposeMemberPtr< decltype(Ptr)>::StructType_t MemberPtrStruct_t
Definition: typegetter.h:96
std::tuple_element_t< 0, decltype(TypeGetter(*static_cast< F * >(nullptr)))> RetTypeRaw_t
Definition: typegetter.h:66
STL namespace.
typename detail::DecomposeMemberPtr< decltype(Ptr)>::Value_t MemberPtrType_t
Definition: typegetter.h:93
std::conditional_t< std::is_same_v< detail::RetTypeRaw_t< F >, detail::ReturnsVoid >, void, detail::RetTypeRaw_t< F > > RetType_t
Definition: typegetter.h:77
std::conditional_t< std::is_same< T, void > {}, ReturnsVoid, T > VoidSafe
Definition: typegetter.h:48
std::tuple_element_t< Idx+1, decltype(detail::TypeGetter(*static_cast< F * >(nullptr)))> ArgType_t
Definition: typegetter.h:70
decltype(TypeGetter(&C::operator())) TypeGetter(const C &c)
Definition: typegetter.h:63