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

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

constexpr void clear() noexcept;

Erases all elements from the container. After this call, size() returns zero.

Invalidates any references, pointers, and iterators referring to contained elements. Any past-the-end iterators are also invalidated.

Linear in the size of the container, i.e., the number of elements.

#include <iostream>
#include <string_view>
#include <inplace_vector>
 
void print_info(std::string_view rem, const std::inplace_vector<int, 3>& v)
{
    std::cout << rem << "{ ";
    for (const auto& value : v)
        std::cout << value << ' ';
    std::cout << "}\n";
    std::cout << "Size=" << v.size() << '\n';
}
 
int main()
{
    std::inplace_vector<int, 3> container{1, 2, 3};
    print_info("Before clear: ", container);
    container.clear();
    print_info("After clear: ", container);
}

Output:

Before clear: { 1 2 3 }
Size=3
After clear: { }
Size=0

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