#include <inplace_vector>
#include <print>
int main()
{
std::inplace_vector<int, 3> a1{1, 2, 3}, a2{4, 5, 6};
auto i1 = a1.begin();
auto i2 = a2.begin();
int& r1 = a1[1];
int& r2 = a2[1];
auto print_them_all = [&](auto rem)
{
std::println("{}a1 = {}, a2 = {}, *i1 = {}, *i2 = {}, r1 = {}, r2 = {}",
rem, a1, a2, *i1, *i2, r1, r2);
};
print_them_all("Before swap:\n");
a1.swap(a2);
print_them_all("After swap:\n");
// Note that after swap() iterators and references stay associated with their
// original sites, e.g., i1 points to element a1[0], r1 refers to a1[1].
}
Before swap: a1 = [1, 2, 3], a2 = [4, 5, 6], *i1 = 1, *i2 = 4, r1 = 2, r2 = 5 After swap: a1 = [4, 5, 6], a2 = [1, 2, 3], *i1 = 4, *i2 = 1, r1 = 5, r2 = 2
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