LeechCraft  0.6.70-6645-gcd10d7e
Modular cross-platform feature rich live environment.
newtype.h
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29 
30 #pragma once
31 
32 namespace LeechCraft
33 {
34 namespace Util
35 {
55  template<typename T, size_t, size_t>
56  class NewType : public T
57  {
58  public:
59  using T::T;
60 
61  NewType () = default;
62 
63  NewType (const T& t)
64  : T { t }
65  {
66  }
67  };
68 
69 #if __cpp_constexpr >= 201304
70  namespace detail
71  {
72  constexpr size_t NewTypeHash (const char *str)
73  {
74  const auto basis = 14695981039346656037ULL;
75  const auto prime = 1099511628211ULL;
76  size_t hash = 0;
77  auto value = basis;
78  for (size_t i = 0; str [i]; ++i)
79  {
80  hash += value;
81  value = (value ^ str [i]) * prime;
82  }
83  return hash;
84  }
85  }
86 #else
87  namespace detail
88  {
89  template<typename T>
90  constexpr size_t NewTypeHash (T)
91  {
92  static_assert (std::is_same<T, struct Foo>::value,
93  "Sorry, no NewTypeHash, seems like your compiler doesn't support relaxed constexpr.");
94  return 0;
95  }
96  }
97 #endif
98 }
99 }
100 
101 #define NewTypeTag LeechCraft::Util::detail::NewTypeHash(__FILE__), __LINE__
constexpr size_t NewTypeHash(T)
Definition: newtype.h:90
NewType(const T &t)
Definition: newtype.h:63
A somewhat "strong" typedef.
Definition: newtype.h:56