+/* Copyright (c) 2015. The SimGrid Team.
+ * All rights reserved. */
+
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
+#ifndef SIMGRID_XBT_LIB_HPP
+#define SIMGRID_XBT_LIB_HPP
+
+#include <cstddef>
+
+#include <vector>
+
+namespace simgrid {
+namespace xbt {
+
+template<class T>
+class Lib {
+private:
+ static std::vector<void(*)(void*)> deleters_;
+protected:
+ std::vector<void*> facets_;
+public:
+ static std::size_t add_level(void (*deleter)(void*))
+ {
+ std::size_t res = deleters_.size();
+ deleters_.push_back(deleter);
+ return res;
+ }
+ template<class U> static
+ std::size_t add_level()
+ {
+ return add_level([](void* p){ delete (U*)p; });
+ }
+ Lib() : facets_(deleters_.size(), nullptr) {}
+ ~Lib()
+ {
+ for (std::size_t i = 0; i < facets_.size(); ++i)
+ if (facets_[i] != nullptr)
+ deleters_[i](facets_[i]);
+ }
+
+ // TODO, make type-safe versions of this
+ void* facet(std::size_t level)
+ {
+ if (level >= facets_.size())
+ return nullptr;
+ else
+ return facets_.at(level);
+ }
+ void set_facet(std::size_t level, void* value, bool use_dtor = true)
+ {
+ if (level >= facets_.size())
+ facets_.resize(level + 1, nullptr);
+ void* old_value = this->facet(level);
+ facets_.at(level) = value;
+ if (use_dtor && old_value != nullptr && deleters_[level])
+ deleters_[level](old_value);
+ }
+};
+
+template<class T>
+std::vector<void(*)(void*)> Lib<T>::deleters_ = {};
+
+}
+}
+
+#endif
