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#pragma once
#include "deimos/core/base.h"
#include "deimos/core/id_name.h"
namespace deimos
{
struct MemoryScope { uint32_t id; };
struct IAllocator
{
IAllocator() = default;
deimos_NO_COPY_MOVE(IAllocator);
virtual ~IAllocator() = default;
[[nodiscard]]
virtual gsl::owner<void*> Reallocate(
gsl::owner<void*> old_ptr, int64_t old_size, int64_t new_size,
MemoryScope scope, const SourceLocation& source_location = {}) = 0;
};
class Allocator
{
gsl::owner<IAllocator*> m_allocator;
const MemoryScope m_scope;
public:
constexpr Allocator(IAllocator* allocator, MemoryScope scope) :
m_allocator{allocator}, m_scope{scope}
{}
deimos_NO_COPY_MOVE(Allocator);
~Allocator() = default;
constexpr IAllocator* allocator() const { return m_allocator; }
[[nodiscard]]
constexpr gsl::owner<void*> Allocate(
int64_t new_size,
const SourceLocation& source_location = {})
{
return m_allocator->Reallocate(nullptr, 0, new_size, m_scope, source_location);
}
[[nodiscard]]
gsl::owner<void*> Reallocate(
gsl::owner<void*> old_ptr, int64_t old_size, int64_t new_size,
const SourceLocation& source_location = {})
{
return m_allocator->Reallocate(old_ptr, old_size, new_size, m_scope, source_location);
}
constexpr void Free(
gsl::owner<void*> old_ptr, int64_t old_size,
const SourceLocation& source_location = {})
{
(void)m_allocator->Reallocate(old_ptr, old_size, 0, m_scope, source_location);
}
template<typename T, typename... Args>
gsl::owner<T*> NewInner(
const SourceLocation& source_location,
Args&&... args)
{
gsl::owner<void*> ptr = Allocate(sizeof(T), source_location);
return new(ptr) T(std::forward<Args>(args)...);
}
template<typename T>
constexpr gsl::owner<T*> New(const SourceLocation& source_location = {})
{
return NewInner<T>(source_location);
}
template<typename T, typename A0>
constexpr gsl::owner<T*> New(A0&& arg0, const SourceLocation& source_location = {})
{
return NewInner<T>(source_location, std::forward<A0>(arg0));
}
template<typename T, typename A0, typename A1>
constexpr gsl::owner<T*> New(
A0&& arg0, A1&& arg1,
const SourceLocation& source_location = {})
{
return NewInner<T>(source_location,
std::forward<A0>(arg0),
std::forward<A1>(arg1));
}
template<typename T, typename A0, typename A1, typename A2>
constexpr gsl::owner<T*> New(
A0&& arg0, A1&& arg1, A2&& arg2,
const SourceLocation& source_location = {})
{
return NewInner<T>(source_location,
std::forward<A0>(arg0),
std::forward<A1>(arg1),
std::forward<A2>(arg2));
}
template<typename T, typename A0, typename A1, typename A2, typename A3>
constexpr gsl::owner<T*> New(
A0&& arg0, A1&& arg1, A2&& arg2, A3&& arg3,
const SourceLocation& source_location = {})
{
return NewInner<T>(source_location,
std::forward<A0>(arg0),
std::forward<A1>(arg1),
std::forward<A2>(arg2),
std::forward<A3>(arg3));
}
template<typename T>
void Delete(gsl::owner<T*> t, const SourceLocation& source_location = {})
{
if constexpr (!std::is_trivially_destructible_v<T>)
{
t->~T();
}
Free(t, sizeof(T), source_location);
}
template<typename T>
gsl::owner<Span<T>> NewArray(int64_t count, const SourceLocation& source_location = {})
requires std::is_default_constructible_v<T>
{
Expects(count > 0);
auto* raw = Allocate((int64_t)sizeof(T) * count, source_location);
if constexpr (std::is_trivially_default_constructible_v<T>)
{
MemoryZero(raw, (int64_t)sizeof(T) * count);
}
else
{
for (int64_t i = 0; i < count; ++i)
{
new((T*)raw + i) T{};
}
}
return Span<T>{ (T*)raw, count };
}
};
class AllocatorApi
{
public:
AllocatorApi() = default;
deimos_NO_COPY_MOVE(AllocatorApi);
virtual ~AllocatorApi() = default;
static constexpr IdName kApiName{"deimos::AllocatorApi"};
Allocator* system{};
virtual gsl::owner<Allocator*> CreateChild(Allocator* parent, gsl::czstring description) = 0;
virtual void DestroyChild(gsl::owner<Allocator*>) = 0;
};
} // namespace deimos
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