Provide some c++17 type_traits convenience for c++11

openSUSE · Mar 14, 2024 · fb7deaf · fb7deaf
1 parent 05216c7
commit fb7deaf
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diff --git a/zypp-core/base/Easy.h b/zypp-core/base/Easy.h
@@ -13,7 +13,7 @@
 #define ZYPP_BASE_EASY_H
 
 #include <cstdio>
-#include <type_traits>
+#include <zypp/base/TypeTraits.h>
 
 /** Convenient for-loops using iterator.
  * \code

diff --git a/zypp/base/TypeTraits.h b/zypp/base/TypeTraits.h
@@ -13,4 +13,43 @@
 
 #include <type_traits>
 
+///////////////////////////////////////////////////////////////////
+// Helper types from https://en.cppreference.com/
+namespace std
+{
+#if __cplusplus < 202002L
+
+#endif // __cplusplus < 202002L
+
+
+#if __cplusplus < 201703L
+  template< class Base, class Derived >
+  inline constexpr bool is_base_of_v = is_base_of<Base, Derived>::value;
+
+  template< class T >
+  inline constexpr bool is_integral_v = is_integral<T>::value;
+
+  template< class T >
+  inline constexpr bool is_pointer_v = is_pointer<T>::value;
+#endif // __cplusplus < 201703L
+
+
+#if __cplusplus < 201402L
+  template< bool B, class T, class F >
+  using conditional_t = typename conditional<B,T,F>::type;
+
+  template< bool B, class T = void >
+  using enable_if_t = typename enable_if<B,T>::type;
+
+  template< class T >
+  using remove_reference_t = typename remove_reference<T>::type;
+
+  template< class T >
+  using result_of_t = typename result_of<T>::type;
+
+  template< class T >
+  using underlying_type_t = typename underlying_type<T>::type;
+#endif // __cplusplus < 201402L
+} // namespace std
+///////////////////////////////////////////////////////////////////
 #endif // ZYPP_TYPETRAITS_H