[libcxx-commits] [libcxx] [libc++][vector] Fixes shrink_to_fit. (PR #97895)

[Mital Ashok via libcxx-commits]

================
@@ -71,9 +71,50 @@ TEST_CONSTEXPR_CXX20 bool tests() {
     return true;
 }
 
+#if TEST_STD_VER >= 23
+std::size_t min_bytes = 1000;
+
+template <typename T>
+struct increasing_allocator {
+  using value_type       = T;
+  increasing_allocator() = default;
+  template <typename U>
+  increasing_allocator(const increasing_allocator<U>&) noexcept {}
+  std::allocation_result<T*> allocate_at_least(std::size_t n) {
+    std::size_t allocation_amount = n * sizeof(T);
+    if (allocation_amount < min_bytes)
+      allocation_amount = min_bytes;
+    min_bytes += 1000;
+    return {static_cast<T*>(::operator new(allocation_amount)), allocation_amount};
----------------
MitalAshok wrote:

```suggestion
    return {static_cast<T*>(::operator new(allocation_amount)), allocation_amount/sizeof(T)};
```

My original example had this error too

https://github.com/llvm/llvm-project/pull/97895