mirror of
https://gitlab.com/suyu-emu/suyu.git
synced 2024-03-15 23:15:44 +00:00
df72480395
Now that clang-format makes [[nodiscard]] attributes format sensibly, we can apply them to several functions within the common library to allow the compiler to complain about any misuses of the functions.
82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
// This file is under the public domain.
|
|
|
|
#pragma once
|
|
|
|
#include <cstddef>
|
|
#include <new>
|
|
#include <type_traits>
|
|
|
|
namespace Common {
|
|
|
|
template <typename T>
|
|
[[nodiscard]] constexpr T AlignUp(T value, std::size_t size) {
|
|
static_assert(std::is_unsigned_v<T>, "T must be an unsigned value.");
|
|
auto mod{static_cast<T>(value % size)};
|
|
value -= mod;
|
|
return static_cast<T>(mod == T{0} ? value : value + size);
|
|
}
|
|
|
|
template <typename T>
|
|
[[nodiscard]] constexpr T AlignDown(T value, std::size_t size) {
|
|
static_assert(std::is_unsigned_v<T>, "T must be an unsigned value.");
|
|
return static_cast<T>(value - value % size);
|
|
}
|
|
|
|
template <typename T>
|
|
[[nodiscard]] constexpr T AlignBits(T value, std::size_t align) {
|
|
static_assert(std::is_unsigned_v<T>, "T must be an unsigned value.");
|
|
return static_cast<T>((value + ((1ULL << align) - 1)) >> align << align);
|
|
}
|
|
|
|
template <typename T>
|
|
[[nodiscard]] constexpr bool Is4KBAligned(T value) {
|
|
static_assert(std::is_unsigned_v<T>, "T must be an unsigned value.");
|
|
return (value & 0xFFF) == 0;
|
|
}
|
|
|
|
template <typename T>
|
|
[[nodiscard]] constexpr bool IsWordAligned(T value) {
|
|
static_assert(std::is_unsigned_v<T>, "T must be an unsigned value.");
|
|
return (value & 0b11) == 0;
|
|
}
|
|
|
|
template <typename T>
|
|
[[nodiscard]] constexpr bool IsAligned(T value, std::size_t alignment) {
|
|
using U = typename std::make_unsigned<T>::type;
|
|
const U mask = static_cast<U>(alignment - 1);
|
|
return (value & mask) == 0;
|
|
}
|
|
|
|
template <typename T, std::size_t Align = 16>
|
|
class AlignmentAllocator {
|
|
public:
|
|
using value_type = T;
|
|
using size_type = std::size_t;
|
|
using difference_type = std::ptrdiff_t;
|
|
|
|
using propagate_on_container_copy_assignment = std::true_type;
|
|
using propagate_on_container_move_assignment = std::true_type;
|
|
using propagate_on_container_swap = std::true_type;
|
|
using is_always_equal = std::true_type;
|
|
|
|
constexpr AlignmentAllocator() noexcept = default;
|
|
|
|
template <typename T2>
|
|
constexpr AlignmentAllocator(const AlignmentAllocator<T2, Align>&) noexcept {}
|
|
|
|
[[nodiscard]] T* allocate(size_type n) {
|
|
return static_cast<T*>(::operator new (n * sizeof(T), std::align_val_t{Align}));
|
|
}
|
|
|
|
void deallocate(T* p, size_type n) {
|
|
::operator delete (p, n * sizeof(T), std::align_val_t{Align});
|
|
}
|
|
|
|
template <typename T2>
|
|
struct rebind {
|
|
using other = AlignmentAllocator<T2, Align>;
|
|
};
|
|
};
|
|
|
|
} // namespace Common
|