fix: stack_alloc after sweep ai work

library/include/er/stack_alloc.h

@@ -1,67 +1,38 @@
-#include <memory>
-#include <new>
 #include <algorithm>
+#include <memory>
 
 namespace er {
 
 template <typename T, size_t size>
 class StackAlloc {
-public:
-    using value_type = T;
-    using pointer = T*;
-    using reference = T&;
-    using const_reference = const T&;
-    using size_type = size_t;
-    using difference_type = ptrdiff_t;
-}
-
-    pointer allocate(size_type n) {
-        if (sizeof(T) * n > size) {
-            return static_cast<pointer>(::operator new(n * sizeof(T)));
-        } else {
-            return reinterpret_cast<pointer>(_stack);
-        }
-    }
-
-    void deallocate(pointer p, size_type n) {
-        if (sizeof(T) * n > size) {
-            ::operator delete(p);
-        } else {
-            // do nothing, stack memory is automatically freed
-        }
-    }
-
-    template <typename U, typename... Args>
-    void construct(U* p, Args&&... args) {
-        new(p) U(std::forward<Args>(args)...);
+ public:
+  using value_type = T;
+  using size_type = size_t;
+  using difference_type = ptrdiff_t;
+
+  T* allocate(size_type n) {
+    if (sizeof(T) * n > size) {
+      return static_cast<T*>(::operator new(n * sizeof(T)));
     }
+    return reinterpret_cast<T*>(_stack_mem);
+  }
 
-    template <typename U>
-    void destroy(U* p) {
-        p->~U();
+  void deallocate(T* p, size_type n) {
+    if (sizeof(T) * n > size) {
+      ::operator delete(p);
     }
-
-    size_type max_size() const noexcept {
-        return std::max<size_type>(1, size / sizeof(T));
-    }
-
-    pointer address(reference x) const noexcept {
-        return std::addressof(x);
-    }
-
-    const T* address(const_reference x) const noexcept {
-        return std::addressof(x);
-    }
-
-    StackAlloc() = default;
-    StackAlloc(const StackAlloc&) = default;
-    StackAlloc& operator=(const StackAlloc&) = default;
-    StackAlloc(StackAlloc&&) = default;
-    StackAlloc& operator=(StackAlloc&&) = default;
-    ~StackAlloc() = default;
-
-private:
-    alignas(T) char _stack[size];
+    // else do nothing, stack memory is automatically freed
+  }
+
+  StackAlloc() = default;
+  StackAlloc(const StackAlloc&) = default;
+  StackAlloc& operator=(const StackAlloc&) = default;
+  StackAlloc(StackAlloc&&) noexcept = default;
+  StackAlloc& operator=(StackAlloc&&) noexcept = default;
+  ~StackAlloc() = default;
+
+ private:
+  alignas(T) uint8_t _stack_mem[size];
 };
 
 }  // namespace er