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Common: Move some duplicate container element construction logic into a ManuallyConstructedValue template.

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This commit is contained in:
Jordan Woyak
2025-04-24 17:11:55 -05:00
parent 852bd6df1a
commit 4899913446
3 changed files with 67 additions and 18 deletions
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14
Source/Core/Common/SmallVector.h
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@ -7,9 +7,13 @@
#include <cstddef>
#include <utility>
#include "Common/TypeUtils.h"
namespace Common
{
// TODO C++26: Replace with std::inplace_vector.
// An std::vector-like container that uses no heap allocations but is limited to a maximum size.
template <typename T, size_t MaxSize>
class SmallVector final
@ -59,13 +63,13 @@ public:
value_type& emplace_back(Args&&... args)
{
assert(m_size < MaxSize);
return *::new (&m_array[m_size++ * sizeof(value_type)]) value_type{std::forward<Args>(args)...};
return m_array[m_size++].Construct(std::forward<Args>(args)...);
}
void pop_back()
{
assert(m_size > 0);
std::destroy_at(data() + --m_size);
m_array[--m_size].Destroy();
}
value_type& operator[](size_t i)
@ -79,11 +83,11 @@ public:
return data()[i];
}
auto data() { return std::launder(reinterpret_cast<value_type*>(m_array.data())); }
auto data() { return m_array.data()->Ptr(); }
auto begin() { return data(); }
auto end() { return data() + m_size; }
auto data() const { return std::launder(reinterpret_cast<const value_type*>(m_array.data())); }
auto data() const { return m_array.data()->Ptr(); }
auto begin() const { return data(); }
auto end() const { return data() + m_size; }
@ -106,7 +110,7 @@ public:
void clear() { resize(0); }
private:
alignas(value_type) std::array<std::byte, MaxSize * sizeof(value_type)> m_array;
std::array<ManuallyConstructedValue<T>, MaxSize> m_array;
size_t m_size = 0;
};