external_libraries/yaml-cpp-0.2.6/include/yaml-cpp/nodeutil.h

   1 #ifndef NODEUTIL_H_62B23520_7C8E_11DE_8A39_0800200C9A66
   2 #define NODEUTIL_H_62B23520_7C8E_11DE_8A39_0800200C9A66
   3
   4 #if !defined(__GNUC__) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || (__GNUC__ >= 4) // GCC supports "pragma once" correctly since 3.4
   5 #pragma once
   6 #endif
   7
   8
   9 namespace YAML
  10 {
  11         template <typename T, typename U>
  12         struct is_same_type {
  13                 enum { value = false };
  14         };
  15
  16         template <typename T>
  17         struct is_same_type<T, T> {
  18                 enum { value = true };
  19         };
  20
  21         template <typename T, bool check>
  22         struct is_index_type_with_check {
  23                 enum { value = false };
  24         };
  25
  26         template <> struct is_index_type_with_check<std::size_t, false> { enum { value = true }; };
  27
  28 #define MAKE_INDEX_TYPE(Type) \
  29         template <> struct is_index_type_with_check<Type, is_same_type<Type, std::size_t>::value> { enum { value = true }; }
  30
  31         MAKE_INDEX_TYPE(int);
  32         MAKE_INDEX_TYPE(unsigned);
  33         MAKE_INDEX_TYPE(short);
  34         MAKE_INDEX_TYPE(unsigned short);
  35         MAKE_INDEX_TYPE(long);
  36         MAKE_INDEX_TYPE(unsigned long);
  37
  38 #undef MAKE_INDEX_TYPE
  39
  40         template <typename T>
  41         struct is_index_type: public is_index_type_with_check<T, false> {};
  42
  43         // messing around with template stuff to get the right overload for operator [] for a sequence
  44         template <typename T, bool b>
  45         struct _FindFromNodeAtIndex {
  46                 const Node *pRet;
  47                 _FindFromNodeAtIndex(const Node&, const T&): pRet(0) {}
  48         };
  49
  50         template <typename T>
  51         struct _FindFromNodeAtIndex<T, true> {
  52                 const Node *pRet;
  53                 _FindFromNodeAtIndex(const Node& node, const T& key): pRet(node.FindAtIndex(static_cast<std::size_t>(key))) {}
  54         };
  55
  56         template <typename T>
  57         inline const Node *FindFromNodeAtIndex(const Node& node, const T& key) {
  58                 return _FindFromNodeAtIndex<T, is_index_type<T>::value>(node, key).pRet;
  59         }
  60 }
  61
  62 #endif // NODEUTIL_H_62B23520_7C8E_11DE_8A39_0800200C9A66