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page_table: Allow page tables to be moved

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Makes page tables and virtual buffers able to be moved, but not copied,
making the interface more flexible.

Previously, with the destructor specified, but no move assignment or
constructor specified, they wouldn't be implicitly generated.
This commit is contained in:
Lioncash 2020-11-17 19:58:41 -05:00
parent 3cfd962ef4
commit b3c8997829
4 changed files with 30 additions and 9 deletions
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23
src/common/virtual_buffer.h
View file

@ -4,25 +4,38 @@
#pragma once
#include "common/common_funcs.h"
#include <utility>
namespace Common {
void* AllocateMemoryPages(std::size_t size);
void FreeMemoryPages(void* base, std::size_t size);
void* AllocateMemoryPages(std::size_t size) noexcept;
void FreeMemoryPages(void* base, std::size_t size) noexcept;
template <typename T>
class VirtualBuffer final : NonCopyable {
class VirtualBuffer final {
public:
constexpr VirtualBuffer() = default;
explicit VirtualBuffer(std::size_t count) : alloc_size{count * sizeof(T)} {
base_ptr = reinterpret_cast<T*>(AllocateMemoryPages(alloc_size));
}
~VirtualBuffer() {
~VirtualBuffer() noexcept {
FreeMemoryPages(base_ptr, alloc_size);
}
VirtualBuffer(const VirtualBuffer&) = delete;
VirtualBuffer& operator=(const VirtualBuffer&) = delete;
VirtualBuffer(VirtualBuffer&& other) noexcept
: alloc_size{std::exchange(other.alloc_size, 0)}, base_ptr{std::exchange(other.base_ptr),
nullptr} {}
VirtualBuffer& operator=(VirtualBuffer&& other) noexcept {
alloc_size = std::exchange(other.alloc_size, 0);
base_ptr = std::exchange(other.base_ptr, nullptr);
return *this;
}
void resize(std::size_t count) {
FreeMemoryPages(base_ptr, alloc_size);