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Showing content from https://en.cppreference.com/w/cpp/algorithm/../../cpp/language/../memory/allocator/deallocate.html below:

std::allocator<T>::deallocate - cppreference.com

(constexpr since C++20)

Deallocates the storage referenced by the pointer p, which must be a pointer obtained by an earlier call to allocate() or allocate_at_least()(since C++23).

The argument n must be equal to the first argument of the call to allocate() that originally produced p, or in the range [m, count] if p is obtained from a call to allocate_at_least(m) which returned {p, count}(since C++23); otherwise, the behavior is undefined.

Calls ::operator delete(void*) or ::operator delete(void*, std::align_val_t)(since C++17), but it is unspecified when and how it is called.

In evaluation of a constant expression, this function must deallocate storage allocated within the evaluation of the same expression.

(since C++20) [edit] Parameters [edit] Return value

(none)

[edit] Example

Output:

#1 S::S(42);
#2  S::S(43);
#3   S::S(44);
#4    S::S(45);
#1 S::id();
#2  S::id();
#3   S::id();
#4    S::id();
#1 S::~S();
#2  S::~S();
#3   S::~S();
#4    S::~S();

[edit] See also allocates uninitialized storage
(public member function) [edit] allocates uninitialized storage at least as large as requested size
(public member function) [edit] deallocates storage using the allocator
(public static member function of std::allocator_traits<Alloc>) [edit]

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