initial commit-moved from vulkan_guide

third_party/fmt/test/mock-allocator.h

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+// Formatting library for C++ - mock allocator
+//
+// Copyright (c) 2012 - present, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+
+#ifndef FMT_MOCK_ALLOCATOR_H_
+#define FMT_MOCK_ALLOCATOR_H_
+
+#include <assert.h>  // assert
+#include <stddef.h>  // size_t
+
+#include <memory>  // std::allocator_traits
+
+#include "gmock/gmock.h"
+
+template <typename T> class mock_allocator {
+ public:
+  mock_allocator() {}
+  mock_allocator(const mock_allocator&) {}
+  using value_type = T;
+  MOCK_METHOD(T*, allocate, (size_t));
+  MOCK_METHOD(void, deallocate, (T*, size_t));
+};
+
+template <typename Allocator> class allocator_ref {
+ private:
+  Allocator* alloc_;
+
+  void move(allocator_ref& other) {
+    alloc_ = other.alloc_;
+    other.alloc_ = nullptr;
+  }
+
+ public:
+  using value_type = typename Allocator::value_type;
+
+  explicit allocator_ref(Allocator* alloc = nullptr) : alloc_(alloc) {}
+
+  allocator_ref(const allocator_ref& other) : alloc_(other.alloc_) {}
+  allocator_ref(allocator_ref&& other) { move(other); }
+
+  allocator_ref& operator=(allocator_ref&& other) {
+    assert(this != &other);
+    move(other);
+    return *this;
+  }
+
+  allocator_ref& operator=(const allocator_ref& other) {
+    alloc_ = other.alloc_;
+    return *this;
+  }
+
+ public:
+  Allocator* get() const { return alloc_; }
+
+  value_type* allocate(size_t n) {
+    return std::allocator_traits<Allocator>::allocate(*alloc_, n);
+  }
+  void deallocate(value_type* p, size_t n) { alloc_->deallocate(p, n); }
+};
+
+#endif  // FMT_MOCK_ALLOCATOR_H_