75 lines
1.8 KiB
C++
75 lines
1.8 KiB
C++
|
// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
|
||
|
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
||
|
|
|
||
|
|
#pragma once
|
||
|
|
|
||
|
|
#include "common/make_unique_for_overwrite.h"
|
||
|
|
|
||
|
|
namespace Common {
|
||
|
|
|
||
|
|
/**
|
||
|
|
* ScratchBuffer class
|
||
|
|
* This class creates a default initialized heap allocated buffer for cases such as intermediate
|
||
|
|
* buffers being copied into entirely, where value initializing members during allocation or resize
|
||
|
|
* is redundant.
|
||
|
|
*/
|
||
|
|
template <typename T>
|
||
|
|
class ScratchBuffer {
|
||
|
|
public:
|
||
|
|
ScratchBuffer() = default;
|
||
|
|
|
||
|
|
explicit ScratchBuffer(size_t initial_capacity)
|
||
|
|
: last_requested_size{initial_capacity}, capacity{initial_capacity},
|
||
|
|
buffer{Common::make_unique_for_overwrite<T[]>(initial_capacity)} {}
|
||
|
|
|
||
|
|
~ScratchBuffer() = default;
|
||
|
|
|
||
|
|
/// This will only grow the buffer's capacity if size is greater than the current capacity.
|
||
|
|
void resize(size_t size) {
|
||
|
|
if (size > capacity) {
|
||
|
|
capacity = size;
|
||
|
|
buffer = Common::make_unique_for_overwrite<T[]>(capacity);
|
||
|
|
}
|
||
|
|
last_requested_size = size;
|
||
|
|
}
|
||
|
|
|
||
|
|
[[nodiscard]] T* data() noexcept {
|
||
|
|
return buffer.get();
|
||
|
|
}
|
||
|
|
|
||
|
|
[[nodiscard]] const T* data() const noexcept {
|
||
|
|
return buffer.get();
|
||
|
|
}
|
||
|
|
|
||
|
|
[[nodiscard]] T* begin() noexcept {
|
||
|
|
return data();
|
||
|
|
}
|
||
|
|
|
||
|
|
[[nodiscard]] const T* begin() const noexcept {
|
||
|
|
return data();
|
||
|
|
}
|
||
|
|
|
||
|
|
[[nodiscard]] T* end() noexcept {
|
||
|
|
return data() + last_requested_size;
|
||
|
|
}
|
||
|
|
|
||
|
|
[[nodiscard]] const T* end() const noexcept {
|
||
|
|
return data() + last_requested_size;
|
||
|
|
}
|
||
|
|
|
||
|
|
[[nodiscard]] T& operator[](size_t i) {
|
||
|
|
return buffer[i];
|
||
|
|
}
|
||
|
|
|
||
|
|
[[nodiscard]] size_t size() const noexcept {
|
||
|
|
return last_requested_size;
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
size_t last_requested_size{};
|
||
|
|
size_t capacity{};
|
||
|
|
std::unique_ptr<T[]> buffer{};
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace Common
|