80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
|
// Copyright 2018 The Abseil 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 ABSL_CONTAINER_INTERNAL_COUNTING_ALLOCATOR_H_
|
||
|
|
#define ABSL_CONTAINER_INTERNAL_COUNTING_ALLOCATOR_H_
|
||
|
|
|
||
|
|
#include <cassert>
|
||
|
|
#include <cstdint>
|
||
|
|
#include <memory>
|
||
|
|
|
||
|
|
namespace absl {
|
||
|
|
namespace container_internal {
|
||
|
|
|
||
|
|
// This is a stateful allocator, but the state lives outside of the
|
||
|
|
// allocator (in whatever test is using the allocator). This is odd
|
||
|
|
// but helps in tests where the allocator is propagated into nested
|
||
|
|
// containers - that chain of allocators uses the same state and is
|
||
|
|
// thus easier to query for aggregate allocation information.
|
||
|
|
template <typename T>
|
||
|
|
class CountingAllocator : public std::allocator<T> {
|
||
|
|
public:
|
||
|
|
using Alloc = std::allocator<T>;
|
||
|
|
using pointer = typename Alloc::pointer;
|
||
|
|
using size_type = typename Alloc::size_type;
|
||
|
|
|
||
|
|
CountingAllocator() : bytes_used_(nullptr) {}
|
||
|
|
explicit CountingAllocator(int64_t* b) : bytes_used_(b) {}
|
||
|
|
|
||
|
|
template <typename U>
|
||
|
|
CountingAllocator(const CountingAllocator<U>& x)
|
||
|
|
: Alloc(x), bytes_used_(x.bytes_used_) {}
|
||
|
|
|
||
|
|
pointer allocate(size_type n,
|
||
|
|
std::allocator<void>::const_pointer hint = nullptr) {
|
||
|
|
assert(bytes_used_ != nullptr);
|
||
|
|
*bytes_used_ += n * sizeof(T);
|
||
|
|
return Alloc::allocate(n, hint);
|
||
|
|
}
|
||
|
|
|
||
|
|
void deallocate(pointer p, size_type n) {
|
||
|
|
Alloc::deallocate(p, n);
|
||
|
|
assert(bytes_used_ != nullptr);
|
||
|
|
*bytes_used_ -= n * sizeof(T);
|
||
|
|
}
|
||
|
|
|
||
|
|
template<typename U>
|
||
|
|
class rebind {
|
||
|
|
public:
|
||
|
|
using other = CountingAllocator<U>;
|
||
|
|
};
|
||
|
|
|
||
|
|
friend bool operator==(const CountingAllocator& a,
|
||
|
|
const CountingAllocator& b) {
|
||
|
|
return a.bytes_used_ == b.bytes_used_;
|
||
|
|
}
|
||
|
|
|
||
|
|
friend bool operator!=(const CountingAllocator& a,
|
||
|
|
const CountingAllocator& b) {
|
||
|
|
return !(a == b);
|
||
|
|
}
|
||
|
|
|
||
|
|
int64_t* bytes_used_;
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace container_internal
|
||
|
|
} // namespace absl
|
||
|
|
|
||
|
|
#endif // ABSL_CONTAINER_INTERNAL_COUNTING_ALLOCATOR_H_
|