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Showing content from https://en.cppreference.com/w/cpp/language/../../cpp/../cpp/container/inplace_vector/pop_back.html below:

std::inplace_vector<T,N>::pop_back - cppreference.com

constexpr void pop_back();

Removes the last element of the container.

If empty() is true:

• If the implementation is hardened, a contract violation occurs. Moreover, if the contract-violation handler returns under “observe” evaluation semantic, the behavior is undefined.
• If the implementation is not hardened, the behavior is undefined.

Iterators and references to the last element are invalidated. The end() iterator is also invalidated.

Constant.

#include <inplace_vector>
#include <print>
 
int main()
{
    std::inplace_vector<int, 4> numbers{1, 2, 3};
    for (; not numbers.empty(); numbers.pop_back())
        std::println("{}", numbers);
}

Output:

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