[ox/std] Add std::allocator

deps/ox/src/ox/std/memory.hpp

@@ -8,8 +8,33 @@
 
 #pragma once
 
+#if __has_include(<memory>)
+
+#include <memory>
+
+#else
+
+namespace std {
+
+template<class T>
+struct allocator {
+	[[nodiscard]]
+	constexpr T *allocate(size_t n) {
+		 return static_cast<T*>(::operator new(n * sizeof(T)));
+	}
+
+	constexpr void deallocate(T *p, std::size_t) {
+		 ::operator delete(p);
+	}
+};
+
+}
+
+#endif
+
 #include "utility.hpp"
 
+
 namespace ox {
 
 template<typename T>