Built motion from commit 6a09e18b.|2.6.11

[motion2.git] / legacy-libs / grpc-cloned / deps / grpc / src / core / lib / gprpp / memory.h

diff --git a/legacy-libs/grpc-cloned/deps/grpc/src/core/lib/gprpp/memory.h b/legacy-libs/grpc-cloned/deps/grpc/src/core/lib/gprpp/memory.h
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+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#ifndef GRPC_CORE_LIB_GPRPP_MEMORY_H
+#define GRPC_CORE_LIB_GPRPP_MEMORY_H
+
+#include <grpc/support/port_platform.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+
+#include <limits>
+#include <memory>
+#include <utility>
+
+// Add this to a class that want to use Delete(), but has a private or
+// protected destructor.
+// Should not be used in new code.
+// TODO(juanlishen): Remove this macro, and instead comment that the public dtor
+// should not be used directly.
+#define GRPC_ALLOW_CLASS_TO_USE_NON_PUBLIC_DELETE         \
+  template <typename _Delete_T, bool _Delete_can_be_null> \
+  friend void ::grpc_core::Delete(_Delete_T*);            \
+  template <typename _Delete_T>                           \
+  friend void ::grpc_core::Delete(_Delete_T*);
+
+// Add this to a class that want to use New(), but has a private or
+// protected constructor.
+// Should not be used in new code.
+// TODO(juanlishen): Remove this macro, and instead comment that the public dtor
+// should not be used directly.
+#define GRPC_ALLOW_CLASS_TO_USE_NON_PUBLIC_NEW      \
+  template <typename _New_T, typename... _New_Args> \
+  friend _New_T* grpc_core::New(_New_Args&&...);
+
+namespace grpc_core {
+
+// Alternative to new, since we cannot use it (for fear of libstdc++)
+template <typename T, typename... Args>
+inline T* New(Args&&... args) {
+  void* p = gpr_malloc(sizeof(T));
+  return new (p) T(std::forward<Args>(args)...);
+}
+
+// Alternative to delete, since we cannot use it (for fear of libstdc++)
+// We cannot add a default value for can_be_null, because they are used as
+// as friend template methods where we cannot define a default value.
+// Instead we simply define two variants, one with and one without the boolean
+// argument.
+template <typename T, bool can_be_null>
+inline void Delete(T* p) {
+  GPR_DEBUG_ASSERT(can_be_null || p != nullptr);
+  if (can_be_null && p == nullptr) return;
+  p->~T();
+  gpr_free(p);
+}
+template <typename T>
+inline void Delete(T* p) {
+  Delete<T, /*can_be_null=*/true>(p);
+}
+
+template <typename T>
+class DefaultDelete {
+ public:
+  void operator()(T* p) {
+    // std::unique_ptr is gauranteed not to call the deleter
+    // if the pointer is nullptr.
+    Delete<T, /*can_be_null=*/false>(p);
+  }
+};
+
+template <typename T, typename Deleter = DefaultDelete<T>>
+using UniquePtr = std::unique_ptr<T, Deleter>;
+
+template <typename T, typename... Args>
+inline UniquePtr<T> MakeUnique(Args&&... args) {
+  return UniquePtr<T>(New<T>(std::forward<Args>(args)...));
+}
+
+// an allocator that uses gpr_malloc/gpr_free
+template <class T>
+class Allocator {
+ public:
+  typedef T value_type;
+  typedef T* pointer;
+  typedef const T* const_pointer;
+  typedef T& reference;
+  typedef const T& const_reference;
+  typedef std::size_t size_type;
+  typedef std::ptrdiff_t difference_type;
+  typedef std::false_type propagate_on_container_move_assignment;
+  template <class U>
+  struct rebind {
+    typedef Allocator<U> other;
+  };
+  typedef std::true_type is_always_equal;
+
+  pointer address(reference x) const { return &x; }
+  const_pointer address(const_reference x) const { return &x; }
+  pointer allocate(std::size_t n,
+                   std::allocator<void>::const_pointer hint = nullptr) {
+    return static_cast<pointer>(gpr_malloc(n * sizeof(T)));
+  }
+  void deallocate(T* p, std::size_t n) { gpr_free(p); }
+  size_t max_size() const {
+    return std::numeric_limits<size_type>::max() / sizeof(value_type);
+  }
+  void construct(pointer p, const_reference val) { new ((void*)p) T(val); }
+  template <class U, class... Args>
+  void construct(U* p, Args&&... args) {
+    ::new ((void*)p) U(std::forward<Args>(args)...);
+  }
+  void destroy(pointer p) { p->~T(); }
+  template <class U>
+  void destroy(U* p) {
+    p->~U();
+  }
+};
+
+}  // namespace grpc_core
+
+#endif /* GRPC_CORE_LIB_GPRPP_MEMORY_H */